TU BRAUNSCHWEIG


Dr. Gerold Jerz

Staatl. geprüfter Lebensmittelchemiker

Tel: +49 (0)531-391-7206 (Büro)
                              - 7208 (Labor)
Fax.: +49 (0)531-391-7230

g.jerz@tu-braunschweig.de

TU Braunschweig
Inst. f. Lebensmittelchemie
Schleinitzstr. 20, 3. OG
Büro No. 306/ Labor No. 308
D-38106 Braunschweig

 

Some Working Fields


- Isolation and structure elucidation of natural products from medicinal plants and traditional vegetables.

- Seminar: ‘State-of-the-art’ techniques for structure elucidation of natural products covering mass-spectrometry, 1D-/2D-NMR, UV- and CD-spectroscopy.

- Supervisor of the Electrospray-LC/MS spectrometer (ESQUIRE-LC, BRUKER).

 

Curriculum Vitae


Since Sept. 2001
Institute of Food Chemistry – Technical University of Braunschweig, working group of Prof. Dr. Peter Winterhalter (Food Chemistry).

Jan. 2000 - Sept. 2001
‘Postdoctoral Research Chemist’ in the R&D-Lab of E.&J. Gallo Winery, Modesto, California, U.S.A.
Isolation and structure elucidation of natural products from grape pomace:
Development of ‘winery-by-products’ and ‘nutraceuticals’.

Sept. 1994 - July 1999 
Institute of Pharmacy and Food Chemistry (University Erlangen-Nürnberg),
working group of Prof. Dr. Hans Achenbach (Natural Product and Pharmaceutical Chemistry).

Ph.D. Thesis (in german): Phytochemische Analyse der afrikanischen Arzneipflanze Ongokea gore (Olacaceae) – Isolierung und Strukturaufklärung neuer bioaktiver Acetylenfettsäuren und Protoflavanone. Universität Erlangen-Nürnberg, 1999.

Aug. 1993 - Aug. 1994
Practical year at the ‘Federal Institute of Food and Health’ - Nürnberg/ Erlangen
2. State Exam for Food Chemists.

May 1989 - May 1993
Study of Food Chemistry at the ‘Friedrich-Alexander-University’ in Erlangen-Nürnberg
1. State Exam for Food Chemists.

 

Edward Chou CCC Award - 2008


5th International Conference on Countercurrent Chromatography, Rio de Janeiro - Brasil, 29th July 2008

 


We are an active member in the

 

Research Network Natural Products against Neglected Diseases  -  ResNet NPND 

 

for more information please click here

 

Book Chapters


G. Jerz, B. Klose, S. Wybraniec, S. Villanueva Rodriguez, P. Winterhalter. Preparative separation and pigment profiling of betalains from fruits of Opuntia ficus by ion-pair high-speed countercurrent chromatography (IP-HSCCC) and off-line LC-ESI-MS/MS. In: Patil, B. S., Jayaprakasha, G. K., Osorio Roa, C., Mahattanatawee, K. (eds.) Tropical and Subtropical Fruits: Flavors, Color, and Health Benefits. ACS Symp. Series 1129, American Chemical Society: Washington, DC, 2013, pp.3-27.

G. Jerz, J. A. Murillo-Velásquez, I. Skrjabin, R. Gök, P. Winterhalter. Anacardic acid profiling in cashew nuts by direct coupling of preparative high-speed countercurrent chromatography and mass spectrometry (prepHSCCC-ESI-/APCI-MS/MS). In: Toth, S., Mussinan, C. (eds) Recent Advances in the Analysis of Food and Flavors. ACS Symp. Series 1098, American Chemical Society: Washington, DC, 2012, pp. 145-165.

G. Jerz, D. Gutzeit, P. Winterhalter. Characterization of Acylated Flavonoid Glycosides from Sea Buckthorn Juice Concentrate (Hippophaë rhamnoides) by Preparative High-Speed Countercurrent Chromatography/ Electrospray Ionization Mass Spectrometry Hyphenation. In: Flavor and Health Benefits of Small Fruits (Eds.: Michael C. Qian, Agnes M. Rimando), ACS Symposium Series, Vol. 1035, Chapter 16, 2010, pp. 253-265, ISBN13: 9780841225497, ISBN: 9780841225503, DOI: 10.1021/bk-2010-1035

D. Gutzeit, G. Jerz, M. Rychlick, B. Klaubert, P. Winterhalter. Effects of Processing and Storage on the Stability of Folate Vitamers and Pantothenic Acid in Sea Buckthorn Berries and Related Products (Hippophaë rhamnoides L. ssp. rhamnoides). In: Flavors in Noncarbonated Beverages (Eds.: Neil C. Da Costa, Robert J. Cannon), ACS Symposium Series, Vol. 1036, Chapter 9, 2010, pp 115-127, ISBN13: 9780841225510, eISBN: 9780841225527, DOI: 10.1021/bk-2010-1036

 

Publications


54. G. Rimbach, A. Fischer, A. Schloesser, G. Jerz, N. Ikuta, Y. Ishida, R. Matsuzawa, S. Matsugo, P.Hübbe, K. Terao, Anti-inflammatory properties of Brazilian green propolis encapsulated in a γ-cyclodextrin complex in mice fed a Western-type diet. International Journal of Molecular Sciences (2017), 14 pages. DOI, Open Access.

53. H. Fuchs, N. Niesler, A. Trautner, S. Sama, G. Jerz, H. Panjideh, A. Weng. Review: Glycosylated Triterpenoids as Endosomal Escape Enhancers in Targeted Tumor Therapies. Biomedicines, 5, 14 (2017), 25 pages. DOI, Open Access.

52. E. Letsyo, G. Jerz, P. Winterhalter, T. Beuerle. Toxic pyrrolizidine alkaloids in herbal medicines commonly used in Ghana. J. Ethnopharmacol. 202 (2017) 154–161. Supplement data

51. S.S. Grecco, T.A. Costa-Silva, F.S. de Sousa, J.T. Mesquita, M.K. Galuppo, A.G. Tempone, R.L.O.R. Cunha, G. Jerz, E.G.A. Martins, M. Uemi, J.H.G. Lago. Antitrypanosomal activity and evaluation of the mechanism of action of dehydrodieugenol isolated from Nectandra leucantha (Lauraceae) and its methylated derivative against Trypanosoma cruzi . Phytomedicine 24 (2017) 62–67.

 50. F. das Neves Costa, M. Neves Vieira, I. Garrard, G. Jerz, S. Ignatova, G. Guimarães Leitão, Schinus terebinthifolius scale-up CCC (Part II): Intra- and inter-apparatus method transference. J. Chromatogr. A 1466 (2016) 76–83.

 49. I. Brito, M. Simirgiotis, G. Jerz, M. Rodríguez Werner, J. Bórques, P. Winterhalter, A. Cárdenas, Crystal structure of 3′,4′,5-trihydroxy-3,7-dimethoxyflavone, C17H14O7, Z. Kristallogr. NCS (2016); aop

 48. I. Brito, J. Bórquez, M. Simirgiotis, A. Cárdenas, G. M. Molina-Salinas, G. Jerz, L. M. Peña-Rodriguez, P. Winterhalter. Crystal structure of methyl 8-hydroxy-3-isopropyl-5a,8-dimethyl-2,3,4,5,5a,6,7,8,10a,10b-decahydrocyclohepta[e]indene-3a(1H)-carboxylate, C21H34O3. Z. Kristallogr. NCS 2016; 231(2): 579–582

47. E. Letsyo, G. Jerz, P. Winterhalter, G. Horn, T. Beuerle. Survey of pyrrolizidine alkaloids in seven varieties of Lappula squarrosa: an alternative source of heart-healthy vegetable oil. Phytochem. Anal. (2016), 27, 133–139.

46. M. Neves Vieira, P. Winterhalter, G. Jerz. Flavonoids from the flowers of Impatiens glandulifera Royle isolated by high performance countercurrent chromatography . Phytochem. Anal. (2016), 27, 116–125.

45. J. Bórquez, N. López Bartolucci, C. Echiburú-Chau, P. Winterhalter, J. Vallejos, G. Jerz, M.J. Simirgiotis. Isolation of cytotoxic diterpenoids from the Chilean medicinal plant Azorella compacta Phil from the Atacama Desert by high-speed counter-current chromatography. J Sci Food Agric (2016), 96, 2832–2838.

44. M.J. Simirgiotis, J. Borquez, M. Neves-Vieira, I. Brito, S. Alfaro-Lira, P. Winterhalter, C. Echiburú-Chau, G. Jerz, A. Cárdenas. Fast isolation of cytotoxic compounds from the native Chilean species Gypothamnium pinifolium Phil. collected in the Atacama Desert, northern Chile. Industrial Crops and Products 76 (2015), 69-76.

43. I. Mädge, L. Cramer, I. Rahaus, G. Jerz, P. Winterhalter, T. Beuerle. Pyrrolizidine alkaloids in herbal teas for infants, pregnant or lactating women, Food Chem. 187 (2015) 491-498. DOI

42. L. Cramer, L. Ernst, M. Lubienski, U. Papke, H.-M. Schiebel, G. Jerz, T. Beuerle. Structural and Quantitative Analysis of Equisetum Alkaloids. Phytochemistry 116 (2015) 269-282. DOI, Supplement data

41. M. Neves Vieira, F. das Neves Costa, G. Guimarães Leitão, I. Garrard, P. Hewitson, S. Ignatova, P. Winterhalter, G. Jerz. Scaled-up high performance countercurrent chromatography fractionation of triterpene acids from Schinus terebinthifolius Raddi berries with off-line atmospheric pressure chemical ionization mass spectrometry detection. J. Chromatogr. A 1389 (2015) 39–48. DOI, Supplement data

40. F. das Neves Costa, G. Jerz, F. de Souza Figueiredo, P. Winterhalter, G. Guimarães Leitão. Solvent system selectivities in countercurrent chromatography using Salicornia gaudichaudiana metabolites as practical example with off-line ESI-MS/MS injection profiling. J. Chromatogr. A 1385 (2015), 20-27. DOI, Supplement data

39. D. Tuwalska, K. Starzak, D. Szot, S. Wybraniec, P. Winterhalter, G. Jerz. Semi-synthesis of red beet betacyanin ethyl-esters by esterification. Challenges of Modern Technology, Vol. 5, No 3 (2014), 27-31.

38. I. Brito, J. Bórquez, M. Simirgiotis, M. Neves Vieira, G. Jerz, P. Winterhalter, M. Bolte, A. Cárdenas. Crystal structure of 2-nor-1,2-secolycoserone, C24H32O4. Z. Kristallogr. NCS 229 (2014), 399-400.

37. J.B. Althaus, G. Jerz, P. Winterhalter, M. Kaiser, R. Brun, T.J. Schmidt. Antiprotozoal activity of Buxus sempervirens and activity-guided isolation of O-tigloyl-cyclovirobuxeine-B as main constituent active against Plasmodium falciparum. Molecules  19 (5) (2014), 6184-6201. Open Access

36. G. Jerz, Y.A. Elnakady, A. Braun, K. Jäckel, F. Sasse, A.A. Al Ghamdi, M.O.M. Omar, P. Winterhalter. Preparative mass-spectrometry profiling of bioactive metabolites in Saudi-Arabian propolis fractionated by high-speed countercurrent chromatography and off-line atmospheric pressure chemical ionization mass-spectrometry injection. J. Chromatogr. A 1347 (2014), 17-29. Supplement data

35. G. Jerz, N. Gebers, D. Szot, M. Szaleniec, P. Winterhalter, S. Wybraniec. Separation of amaranthin-type betacyanins by ion-pair high-speed countercurrent chromatography. J. Chromatogr. A 1344 (2014) 42-50.

34.  A.R. Nanfack Donfack, M. Feussi Tala, H. Kamdem Wabo, G. Jerz, G.-Z. Zeng, P. Winterhalter, N.-H. Tan, P. Tane. Two new anthraquinone dimers from stem bark of Pentas schimperi (Rubiaceae). Phytochemistry Letters 8 (2014), 55-58.

33. M.P. Rodríguez-Rivera, E. Lugo-Cervantes,  P. Winterhalter, G. Jerz. Metabolite profiling of polyphenols in peels of Citrus limetta Risso by combination of preparative high-speed countercurrent chromatography and LC-ESI-MS. Food Chem. 158 (2014) 139-152. Supplement data 

32. M. Thakur, G. Jerz, D. Tuwalska, R. Gilabert-Oriol, S. Wybraniec, P. Winterhalter, H. FuchsA. Weng. High-speed countercurrent chromatographic recovery and off-line electrospray ionization mass spectrometry profiling of bisdesmodic saponins from Saponaria officinalis possessing synergistic toxicity enhancing properties on targeted antitumor toxins. J. Chromatogr. B 955-956 (2014) 1-9. Supplement data 

31. D. Tuwalska, D. Szot, S. Wybraniec, P. Winterhalter, G. Jerz. Spiral-coil countercurrent chromatographic separation of betanin and betanidin ethyl-esters monitored by continuous ESI-MS/MS injection and LC-ESI-MS/MS. Challenges of Modern Technology 4 (2013), 21-25, ISSN 2082-2863.

30. M. del R. Ramos-Jerz, S. Villanueva, G. Jerz, P. Winterhalter, A. M. Deters. Persea americana MILL. seed: fractionation, characterization and keratinocytes and fibroblasts. J. Evidence-Based Complementary Altern. Med. 2013, Article ID 391247, 12 pages (2013) doi:10.1155/2013/391247 Open Access

29. S. Macke, G. Jerz, M.T. Empl, P. Steinberg, P. Winterhalter. Activity-guided Isolation of Resveratrol-Oligomers from a Grapevine Shoot Extract Using Countercurrent Chromatography. J. Agric Food Chem. 60 (2012), 11919-11927.

28. A. Spórna, P. Stalica, G. Jerz, M. Szaleniec, S. Wybraniec. Liquid chromatographic techniques in separation of betacyanins and their derivatives from red beet roots (Beta vulgaris L.). Challenges of Modern Technology 1 (2010) 19-22. ISSN 2082-2863

27. G. Jerz, N. Gebers, S. Wybraniec, P. Winterhalter. Target guided separation of acyl-oligosaccharide linked betacyanins from bracts of Bougainvillea glabra by direct coupling of preparative ion-pair high-speed countercurrent chromatography and electrospray ionization mass spectrometry.  J. Chromatogr. A 1217 (2010), 4544-4554.

26. S. Wybraniec, G. Jerz, N. Gebers, P. Winterhalter, Ion-pair high speed countercurrent chromatography fractionation of a high-molecular weight variation of acyl-oligosaccharide linked betacyanins from purple bracts of Bougainvillea glabra, J. of Chromatogr. B, 878 (2010) 538-550.

25. S. Wybraniec, P. Stalica, G. Jerz, B. Klose, N. Gebers, P. Winterhalter, A. Spórna, M. Szaleniec, Y. Mizrahi, Separation of polar betalain pigments from cacti fruits of Hylocereus polyrhizus by ion-pair high-speed counter-current chromatography, J. Chromatogr. A, 1216 (2009) 6890-6899.

24. D. de Beer, G. Jerz, E. Joubert, V. Wray, P. Winterhalter; Isolation of isomangiferin from honeybush (Cyclopia subternata) leaves using high-speed counter-current chromatography. J. Chromatogr. A, 1216 (2009) 4282-4289.

23. D. Gutzeit, G. Baleanu, P. Winterhalter, G. Jerz; Vitamin C Content in Sea Buckthorn Berries (Hippophaë rhamnoides L. ssp. rhamnoides) and Related Products: A Kinetic Study on Storage Stability and the Determination of Processing Effects. Journal of Food Science 2008, Vol 73, 9, C615-C620.

22. G. Jerz, T. Skotzki, K. Fiege, P. Winterhalter, S. Wybraniec; Separation of Betacyanins and Betaxanthins from Berries of Phytolacca americana by Ion-Pair High-Speed Countercurrent Chromatography,  J. Chromatogr. A, 1190 (2008) 63-73.

21. D. Gutzeit, S. Mönch, G. Jerz, P. Winterhalter, M. Rychlik. Folate content in sea buckthorn berries and related products (Hippophaë rhamnoides L. ssp. rhamnoides): Determination of folate vitamer stability influenced by processing and storage assessed by stable isotope dilution assay. Anal Bioanal Chem. 2008, 391 (1), 211-219.

20. D. Gutzeit, P. Winterhalter, G. Jerz. Nutritional assessment of processing effects on major and trace element content in sea buckthorn juice (Hippophaë rhamnoides L. ssp. rhamnoides). Journal of Food Science 2008, Vol 73, 6, H97-H102.

19. D. Gutzeit, P. Winterhalter, G. Jerz. Application of preparative high-speed countercurrent chromatography/ electrospray ionization mass spectrometry (HSCCC/ESI-MS-MS) for a fast screening and fractionation of polyphenols. J. Chromatogr. A, 1172 (2007) 40-46.

18. D. Gutzeit, G. Baleanu, P. Winterhalter, G. Jerz. Determination of Processing Effects and of Storage Stability on Vitamin K1 (Phylloquinone) in Sea Buckthorn Berries (Hippophaë rhamnoides L. ssp. rhamnoides) and Related Products. Journal of Food Science 2007, Vol 72, 9, C491.

17. G. Jerz, T. N. Arrey, V. Wray, Q. Du, P. Winterhalter. Structural characterization of 132-hydroxy-(132-S)-phaeophytin-a from leaves and stems of Amaranthus tricolor isolated by high-speed countercurrent chromatography. Innovative Food Science and Emerging Technologies 2007, 8, 413-418.

16. D. Gutzeit, B. Klaubert, M. Rychlik, P. Winterhalter, G. Jerz. Effects of processing and of storage on the stability of pantothenic acid in sea buckthorn products (Hippophaë rhamnoides L. ssp. rhamnoides) assessed by stable isotope dilution assay and HPLC-ESI-MS. J. Agric Food Chem., 2007, 55, 3978-3984.

15. D. Gutzeit, V. Wray, P. Winterhalter, G. Jerz. Preparative isolation and purification of flavonoids and protocatechuic acid from sea buckthorn juice concentrate (Hippophaë rhamnoides ssp. L. rhamnoides) by high-speed counter-current chromatography (HSCCC), Chromatographia, 2007, 65, 1-7.

14.  Q. Du, L. Shen, L. Xiu, G. Jerz, P. Winterhalter. Di-2-ethylhexyl phthalate in the fruits of Benincasa hispida, Food Addit Contam. 2006, 23(6), 552-555.

13.  Q. Du, Y. Xu, L. Li, Y. Zhao, G. Jerz, P. Winterhalter. Antioxidant constituents in the fruits of Luffa cylindrica  (L.) Roem, J. Agric. Food Chem., 54, 4186-4190 (2006).

12.  G. Jerz, R. Waibel, H. Achenbach. Cyclohexanoid protoflavanones from the stem-bark and roots of Ongokea gore. Phytochemistry, 66, 2005, 1698-1706.

11.  Q. Du, L. Li, G. Jerz. Purification of astilbin and isoastilbin in the extract of Smilax glabra rhizome by high-speed counter-current chromatography, J. Chromatogr. A, 1077, 98-101 (2005).

10.  Q. Du, G. Jerz, Y. He, L. Li, Y. Xu, Q. Zhang, Q. Zheng, P. Winterhalter, Y. Ito. Semi-industrial isolation of salicin and amygdalin from plant extracts using slow rotary counter-current chromatography. J. Chromatogr. A 1074, 43-46 (2005).

9.  Q. Du, G. Jerz, P. Winterhalter. Preparation of three flavonoids from the bark of Salix alba by high-speed countercurrent chromatographic separation, Journal of Liquid Chromatography & Related Technologies, 27, 3257-3264 (2004).

8.  Q. Du, G. Jerz, P. Chen, P. Winterhalter. Preparation of ursane triterpenoids from Centella asiatica using high-speed countercurrent chromatography with step-gradient elution, Journal of Liquid Chromatography & Related Technologies, 2201-2215 (2004).

7.  Q. Du, G. Jerz, P. Winterhalter. Isolation of two anthocyanin-sambubiosides from bilberry (Vaccinium myrtillus) by high-speed countercurrent chromatography, J. Chromatogr. A 1045, 59-63 (2004).

6.  Q. Du, P. Chen, G. Jerz, P. Winterhalter. Preparative separation of flavonoid glycosides in leaves extract of Ampelopsis grossedentata using high-speed countercurrent chromatography, J. Chromatogr. A 1040, 147-149 (2004).

5.  M. del R. Ramos, G. Jerz, S. Villanueva , F. López-Dellamary, R. Waibel, P. Winterhalter. Two glucosylated abscic acid derivates from avocado seeds (Persea americana Mill. Lauraceae c.v. Hass), Phytochemistry 65, 955-962, 2004.

4.  G. Jerz, Process For Extracting Oleanolic Acid From Plant Material. Assignee: E. & J. Gallo Winery, Modesto, CA, U.S.A. US Patent No. 6,700,014 B2; Issue of Patent: 02-03-2004.

3.  Q. Du, G. Jerz, R. Waibel, P. Winterhalter. Isolation of dammarane saponins from Panax notoginseng by high-speed counter-current chromatography. J. Chromatogr. A 1008, 173-180 (2003).

2.  M. Schwarz, G. Jerz, P. Winterhalter. Isolation and structure of pinotin A, a new anthocyanin derivative from pinotage wine. Vitis 42, 105-106 (2003).

1. Q. Du, G. Jerz, P. Winterhalter. Separation of andrographolide and neoandrographolide from the leaves of Andrographis paniculata using high-speed counter-current chromatography. J. Chromatogr. A 984, 147-151 (2003).

 

Poster Presentations and Proceedings


4th International Symposium on Recent Advances in Food Analysis Prague / Czech Republic, 4.11. - 6.11.2009 

S. Wybraniec, P. Stalica, G. Jerz, B. Klose, N. Gebers, P. Winterhalter, A. Spórna, M. Szaleniec, Y. Mizrahi. Influence of perfluorinated carboxylic acids on separation of polar betacyanins in ion-pair high-speed countercurrent chromatography.

 

Lebensmittelchemiker Tag Berlin, 14.09.-16.09.2009

A. Fajardo-Oliveros, P. Winterhalter, G. Jerz. Investigation of the Colombian fruit ‘Cocona’ (Solanum sessiliflorum) by direct coupling of preparative high-speed countercurrent chromatography/ electrospray ionization mass spectrometry (prepHSCCC-ESI-MS/MS). Abstract book p. 67. Summary in Lebensmittelchemie 64, 17-48 (2010) 41.

S. Macke, D. Gutzeit, C.C. Voigt, P. Winterhalter, G. Jerz. Application of preparative high-speed countercurrent chromatography/ electrospray ionization mass spectrometry for a fast target-guided screening of steroid alkaloid oligoglycosides in fruits of Solanum rugosum. Abstract book p. 68. Summary in Lebensmittelchemie 64, 17-48 (2010) 42.

G. Jerz, J. Murillo-Velásquez, P. Winterhalter. Isolation and identification of novel C17-chain anacardic acids from heated cashew nut shell oil (Anacardium occidentale) by direct coupling of preparative HSCCC and ESI-MS-MS. Abstract book p. 69. Summary in Lebensmittelchemie 64, 17-48 (2010) 42.

D. Gutzeit, P. Winterhalter, G. Jerz. Major and Trace Element Content in Sea Buckthorn Juice (Hippophaë rhamnoides L. ssp. rhamnoides): Nutritional Assessment of Processing Effects. Abstract book p. 121 Summary in Lebensmittelchemie 64, 17-48 (2010) 34-35.

 

Analityczne Zastosowania Chromatografii Cieczowej, III Konferencja - Warsaw, Poland 23.-24. Oct 2008

S. Wybraniec, P. Stalica, M. Szaleniec, G. Jerz. Chromatograficzne Badania betacyjanin w owocach Chenopodium foliosum technika LC-ESI-MS.

S. Wybraniec, P. Stalica, M. Szaleniec, G. Jerz. Identyfikacja betalain w Chenopodium quinoa technika LC-ESI-MS.

 

6th International Symposium on Chromatography of Natural Products - Lublin, Poland 15-18 Juni 2008

S. Wybraniec, P. Stalica, G. Jerz, N. Gebers, D. Gutzeit, P. Winterhalter, Y. Mizrahi. Ion-pair high-speed counter-current chromatographic separation of polar and lipophilic betalains from plant material.

 

Pigments in Food - Helsinki, Finland, 14.-16. August 2008

S. Wybraniec, P. Stalica, G. Jerz, A. Spórna, P. Suryło, T. Michałowski, G. Jaworska, A. Biernacka. LC-ESI-MS/MS identification of betacyanins in two Amaranthaceae species.

 

Lebensmittelchemiker Tag - Kaiserslautern, 08.-10. Sept. 2008

N. Gebers, G. Jerz, P. Winterhalter, S. Wybraniec. Continuous gradient ion-pair high-speed countercurrent chromatography (IP-grad-HSCCC) for preparative isolation of acylated betalains from Bougainvillea glabra bracts.  Abstract book p. 147.

D. Gutzeit, G. Baleanu, P. Winterhalter, G. Jerz. Vitamin K1 (Phylloquinone) content in Sea Buckthorn Berries and Related Products (Hippophaë rhamnoides L. ssp. rhamnoides): Determination of Vitamin K1 Stability Influenced by Processing and Storage. Abstract book  p. 148.

 

27th International Symposium on Chromatography - Münster, 21.-25. Sept. 2008

S. Wybraniec, G. Jerz, P. Stalica, T. Michałowski; Separation of feruloylated and sinapoylated betacyanins in different chromatographic systems.

 

5th International Conference on countercurrent chromatography - CCC 2008, Rio de Janeiro, Brasil 24.-29. July 2008

G. Jerz, N. Gebers, D. Gutzeit, S. Wybraniec, P. Winterhalter. Isolation of acylated betalain pigments from Bougainvillea glabra bracts by on-line coupling of preparative ion-pair high-speed countercurrent chromatography and electrospray ionization mass spectrometry.

G. Jerz, S. Macke, D. Gutzeit, A. Fajardo-Oliveros, C. C. Voigt, P. Winterhalter. Application of preparative high-speed countercurrent chromatography/ electrospray ionization mass spectrometry for a fast target guided screening of steroid alkaloid oligoglycosides in fruits of Solanum species.

D. de Beer, G. Jerz, E. Joubert, P. Winterhalter. Isolation of isomangiferin from honeybush (Cyclopia subternata) leaves using high-speed counter-current chromatography .

 

I. International Interdisclipinary Technical Conference of Young Scientists, Poznan, Poland, 17.-18. April 2008

S. Wybraniec, P. Stalica, A. Sporna, P. Surylo, T. Michalowski, G. Jerz, G. Jaworska, A. Biernacka. Mass spectrometric study on new betacyanins in Iresine herbstii leaves.

 

Lebensmittelwissenschaften im Fokus: Lipide und Lipoide - Proteine und Enzyme, 5.-6. Nov. 2007 - Frankfurt

S. Macke, S. Baldermann S., P. Fleischmann, P. Winterhalter, G. Jerz. Isolation of lipophilic constituents of blossoms of stems of Amaranthus tricolor by ‘High Speed Countercurrent Chromatography’ (HSCCC) applying the elution-extrusion mode.

G. Jerz,  M. del. R. Ramos, R.  Waibel, H. Achenbach, P.  Winterhalter. Cytotoxic acetylenic fatty acids from Ongokea gore with potential antitumor activity and a phosphocholine derivative.

 

Deutscher Lebensmittelchemikertag  10.-12. Sept. 2007 – Erlangen/ Nürnberg

A. Wilkens, K. Volmer, G. Jerz, V. Lander, P. Winterhalter, Methodenentwicklung zur Quantifizierung von Ginkgo biloba in Teezubreitungen. Abstract book p.192.

D. Gutzeit, B. Klaubert, M. Rychlik, P. Winterhalter, G. Jerz; Pantothenic Acid Stability of Pantothenic Acid in Sea Buckthorn Berries and Related Products (Hippophaë rhamnoides L. ssp. rhamnoides) during Storage and Production. Abstract book p.113. Summary in Lebensmittelchemie 62, 49-80 (2008) 66.

D. Gutzeit, P. Winterhalter, G. Jerz; High-Speed Counter-Current Chromatography Electrospray Ionization Mass Spectrometry (HSCCC/ESI-MS-MS) – an Online Screening Technique for Selective Preparative Fractionation of Natural Products. Abstract book p.114. Summary in Lebensmittelchemie 62, 49-80 (2008) 65.

T. Skotzki, G. Jerz, V. Wray, K. Fiege, P. Winterhalter, S. Wybraniec; 15R- and 15S-betanin from berries of Phytolacca americana isolated by preparative ion-pair high-speed countercurrent chromatography (IP-HSCCC). Abstract book p.138. Summary in Lebensmittelchemie 62, 49-80 (2008) 75.

O. Nehring, S. Stoll, P. Winterhalter, G. Jerz; Preparative Isolation of Hulupinic Acid from Hop Cones (Humulus lupulus) by ‚High Speed Countercurrent Chromatography‘ (HSCCC). Abstract book p.139. Summary in Lebensmittelchemie 62, 49-80 (2008) 75.

S. Stoll, G. Jerz, P. Winterhalter; Antioxidativ wirksame Inhaltsstoffe aus Perilla frutescens. Abstract book p.189.

M. Trantas, G. Jerz, M. Stürtz, P. Winterhalter, F. Ververidis; Engeneering of biologically active plant pathways in yeast to produce compounds with additive value. Abstract book p.210.

 

XIV International Bat Research Conference (37th NASBR) 19.-23. August 2007 Mérida - Mexico.

G. Jerz, G. Tschetseubu, V. Wray, P. Winterhalter, C. Voigt. The bioactive steroid saponin 22-methyl-O-protodioscin was isolated from fruits of Solanum rugosum - a preferred feeding source for bats.

 

Workshop Productos naturales, Proyecto BIOPOLIS, 26.-28. July 2007, Funchal, Madeira - Portugal.

G. Jerz, M. del R. Ramos, R. Waibel, H. Achenbach, P. Winterhalter; Phosphocholine-derivate of a cytotoxic acetylenic fatty acid from Ongokea gore with potential anti-tumor activity.  Abstract book, p. 34.

 

Eurobiotech, 25. - 27. April 2007, Cracow - Poland 

Wybraniec, S.; Mizrahi, Y.; Skotzki, T.; Winterhalter, P., and Jerz, G. Separation of betalains from cacti fruits of Hylocereus polyrhizus by preparative high-speed countercurrent chromatography (HSCCC). Abstract book Vol 54, O1.2.5, p. 13.
Acta Biochimica Polonica 2007; 54 (Supplement 1 - Abstracts of the 1st International Conference "EUROBIOTECH" Biotechnology in Agriculture Kraków, Poland, 25-27 April, 2007):13.

Jerz, G.; Fiege, K.; Skotzki, T.; Wray, V.; Winterhalter, P., and Wybraniec, S. Separation of betalains and a saponin from berries of Phytolacca americana by preparative high-speed countercurrent chromatography (HSCCC). Abstract book Vol 54, p. 35.
Acta Biochimica Polonica 2007; 54 (Supplement 1 - Abstracts of the 1st International Conference "EUROBIOTECH" Biotechnology in Agriculture Kraków, Poland, 25-27 April, 2007):35-36 (P2.2.16, Poster)

 

4th International Congress on Pigments in Food, 9.-12. Oct. 2006, Stuttgart-Hohenheim.

G. Jerz, T.N. Arrey, V. Wray, Q. Du, P. Winterhalter; Isolation of 132-hydroxy-(132-S)-phaeophytin-a from leaves and stems of Amaranthus tricolor by high-speed countercurrent chromatography. Abstract book p. 65-67 (Ed. R. Carle, A. Schieber, F. Stintzing), Shaker Verlag GmbH – Aachen, ISBN 3-8322-5479-X.

 

Deutscher Lebensmittelchemikertag  18.-20. Sept. 2006, Dresden.

G. Jerz, T.N. Arrey, V. Wray, Q. Du, P. Winterhalter; Lipophilic tetraterpenoids isolated from the leaves and stems of Amaranthus tricolor. Abstract book p. 143. Summary in Lebensmittelchemie 61, 5 (2007) 116.

D. Gutzeit, G. Jerz, V. Wray, P. Winterhalter; Preparative isolation and purification of flavonoids from concentrated juice of sea buckthorn berries (Hippophaë rhamnoides ssp. Rhamnoides) by high-speed counter-current chromatography (HSCCC). Abstract book p. 171. Summary in Lebensmittelchemie 61, 5 (2007) 128.

 

Deutscher Lebensmittelchemikertag  19.-21. Sept. 2005, Hamburg.

M. del R. Ramos, G. Jerz, S. Villanueva, P. Winterhalter; Bioactive lipids isolated from avocado seeds (Persea americana Mill., Lauraceae) by HSCCC. Summary in Lebensmittelchemie 60, 4 (2006) 84.

G. Jerz, O. Nehring, P. Winterhalter; Preparative fractionation of isoprenylated chalcones from hop cones (Humulus lupulus) by High Speed Countercurrent Chromatography (HSCCC). Summary in Lebensmittelchemie 60, 4 (2006) 85.

S. Stoll, G. Jerz, P. Winterhalter; Isolation and structure elucidation of nasunin and N1, N10-dihydrocaffeoylspermidine of Chinese eggplants. Lebensmittelchemie 60, 4 (2006) 91.

 

Deutscher Lebensmittelchemikertag  13.-15. Sept. 2004, Bonn.

G. Jerz, P. Winterhalter; Isolation of the bioactive triterpene ‚oleanolic acid‘ from grape pomace (Cabernet Sauvignon) by ‚High speed countercurrent chromatography‘ (HSCCC). Abstract book p. 199. Summary in Lebensmittelchemie 59, 1 (2005) 22.

G. Jerz, R. Waibel, H. Achenbach; GC-MS Strukturanalyse von Mehrfachbindungssystemen in konjugierten Acetylenfettsäuren aus Ongokea gore (Olacaceae) nach positionsspezifischer Deuterierung und DMOX-Derivatisierung. Abstract book p. 138. Summary in Lebensmittelchemie 58, (2004) 152.

X.-D. Hu, G. Jerz, A. Körn, P. Winterhalter; Separation of anthocyanins and flavonoids from Perilla frutescens by ‚High Speed Countercurrent Chromatography‘. Abstract book p. 197. Summary in Lebensmittelchemie 59, 1 (2005) 21.

M. del R. Ramos, G. Jerz, S. Villanueva, F. López-Dellamary, P. Winterhalter; A novel persenone analogue from avocado seeds (Persea americana Mill., Lauraceae). Abstract book p. 198. Summary in Lebensmittelchemie 59, 1 (2005) 21.

 

XXII International Conference on Polyphenols, Helsinki, 25.-28. August, 2004.

G. Jerz, R. Waibel, H. Achenbach, Novel Protoflavanones from the West-african Medicinal Tree Ongokea gore (Olacaceae). Polyphenols Communication ICP 2004,  Abstract book: p. 603. ISBN: 952-10-1977-8.

M. del R. Ramos, G. Jerz, S. Villanueva, F. López-Dellamary, R. Waibel, P. Winterhalter. A-Type proanthocyanidin trimers from avocado seeds (Persea americana Mill. cv. Hass,  Lauraceae). Polyphenols Communications ICP 2004, Abstract book: p. 683. ISBN: 952-10-1977-8.

M. del R. Ramos, G. Jerz, P. Winterhalter, A. Hensel, Biological Activity of Proanthocyanidins from Avocado Seeds (Persea americana Mill. cv Hass, Lauraceae) on natural human keratinocytes. Polyphenols Communications ICP 2004, Abstract book: p. 839. ISBN: 952-10-1977-8.

 

Deutscher Lebensmittelchemikertag 2003, 6.-11. Oktober 2003, München.

A. Körn, G. Jerz, P. Winterhalter: Isolierung von Cumarinderivaten aus Citrus limon mittels High-Speed Countercurrent Chromatography (HSCCC). Summary in: Lebensmittelchemie 58,17-32 (2004).

N. Köhler, Q. Du, G. Jerz, M. Schwarz, P. Winterhalter: Large-scale recovery of anthocyanin pigments from red wine by Low Speed Rotary Countercurrent Chromatography (LSRCCC) versus High Speed Countercurrent Chromatography (HSCCC). Summary in: Lebensmittelchemie 58, 4 (2004).

 

Karlsruher Ernährungstage: Phytoestrogens - Benefits and Risks for Human Health, 12. - 14. Oktober 2003, Karlsruhe.

N. Zimmermann, G. Jerz, P. Winterhalter: Purification and isolation of isoflavone structures by high-speed countercurrent chromatography (HSCCC). 

 

Deutscher Lebensmittelchemikertag  9.-11. Sept. 2002, Frankfurt.

Maria del R. Ramos, G. Jerz, S. Villanueva, F. López-Dellamary, P. Winterhalter, Isolierung und Strukturaufklärung von zwei Abscisinsäure-Derivaten aus Avocado-Kernen (Persea americana Mill., Lauraceae). Summary in: Lebensmittelchemie 57, 60 (2003).

 

Presentations


German-Japan joint symposium and graduate students forum for the promotion of the Double Degree Program, Shizuoka - Japan,  23.-29. Nov. 09
G. Jerz, P. Winterhalter; Characterization of Acylated Flavonoid Glycosides from Sea Buckthorn (Hippophaë rhamnoides) Juice Concentrate by Preparative HSCCC/ESI-MS-MS Coupling.  Abstract book p.48 - 49.

Lebensmittelchemisches Kolloquium, Institut für Lebensmittelchemie, Stuttgart-Hohenheim, 25. June 09
G. Jerz; Gegenstromverteilungschromatographie: eine vielseitige Methode zur Isolierung bioaktiver Naturstoffe: Grundlagen – Anwendungsbeispiele - Weiterentwicklungen

Chemie-Dozenten-Tagung, Göttingen, 11. March 2009
G. Jerz; Direct Coupling of preparative high-speed countercurrent chromatography and electrospray ionization mass spectrometry (HSCCC/ESI-MS-MS) for a target-guided isolation of bioactive natural products. Abstract book p. 55.

CUCEI, Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara, Mexico, 05. Jan. 2009
G. Jerz, P. Winterhalter; Direct coupling of preparative high-speed countercurrent chromatography with electrospray ionization mass spectrometry (HSCCC/ESI-MS/MS) for a target-guided isolation of bioactive natural products.

CIATEJ, Research Center of Investigation, Technical and Design Assistance of Jalisco State, Guadalajara, Mexico
G. Jerz, M. del R. Ramos-Jerz, S. Villanueva; Seminar-Series and Practical Course ‘FITOQUÍMICA’ in the DAAD-PROALMEX project No D/07/10252 PPP  04.-11. Dec. 2008.

Brunel University, Institute of Bioengineering, Uxbridge, Great Britain, 12. Nov. 2008
G. Jerz, P. Winterhalter; Direct coupling of preparative high-speed countercurrent chromatography with electrospray ionization mass spectrometry (HSCCC/ESI-MS/MS).

HZI Helmholtz Centre of Infection Research - Braunschweig, 6. Nov. 2008
G. Jerz, P. Winterhalter; Countercurrent Chromatography  –  CCC. A versatile technique for preparative isolation of bioactive natural products
Basics - Applications - Current Improvements

27th International Symposium on Chromatography - Münster, 21.-25. Sept. 2008
G. Jerz , N. Gebers, D. Gutzeit, P. Winterhalter, S. Wybraniec; Direct coupling of preparative ion-pair high-speed countercurrent chromatography with electrospray ionization mass spectrometry (IP-HSCCC/ESI-MS/MS) for target-guided isolation of acylated betalains

5th International Conference on countercurrent chromatography - CCC2008, Rio de Janeiro, Brasil 24.-29 July 2008
G. Jerz, S. Macke, D. Gutzeit, A. Fajardo-Oliveros, C.C. Voigt, P. Winterhalter. Application of preparative high-speed countercurrent chromatography/electrospray ionization mass spectrometry for a fast target guided screening of steroid alkaloid oligoglycosides in fruits of Solanum species.

Workshop Productos naturales, Proyecto BIOPOLIS, 26.-28. July 2007, Funchal, Madeira, Portugal.
M. del. R. Ramos, G. Jerz, S. Villanueva, R. Waibel, P. Winterhalter. Bioactive lipid compounds from avocado seeds (Persea americana Mill, c.v. Hass). Abstract book p. 18.

CIATEJ, Research Center of Investigation, Technical and Design Assistance of Jalisco State, 14. May. 2007, Guadalajara, Mexico.
G. Jerz, Q. Du, M.R. Ramos, T. Skotzki, V. Wray, D. Gutzeit, S. Wybraniec,  O. Nehring, P. Winterhalter; Preparative isolation of bioactive natural products from fruits, chinese vegetables and medicinal plants by means of high-speed countercurrent chromatography (HSCCC).

Sino-German Workshop (chinesische Biowirkstoffe), Graduiertenkolleg, am Lehrstuhl für Lebensmitteltechnologie (Food Technology), Institut für Humanernährung und Lebensmittelkunde Universität Kiel. 11. July, Kiel, 2006.
G. Jerz, S. Stoll, T. N. Arrey, V. Wray, Q. Du, P. Winterhalter. Anwendung der ‚High-Speed Countercurrent Chromatography’ (HSCCC) in der Naturstoffanalytik sowie Isolierung und Strukturaufklärung von Tetraterpenen und Chlorophyll-Abbauprodukten aus Amaranthus tricolor.

Technical Educational Institute (TEI) – Crete, Greece, 25. May 2005.
G. Jerz, Q. Du, M. del R. Ramos, O. Nehring, P. Winterhalter. Preparative Isolation of Bioactive Natural Products from Medicinal Plants by ‘High Speed Countercurrent Chromatography’ (HSCCC).

Institut für Pharmazeutische Biologie, Lebensmittelchemisches und pharmazeutisches-Kolloquium, 14. Dec. 2004, Münster.
G. Jerz, Q. Du, X. Hu, O. Nehring, P. Winterhalter, Präparative Isolierung bioaktiver Inhaltsstoffe aus Arzneipflanzen mittels ‘High speed countercurrent chromatography’.

Institut für Gemüse und Zierpflanzenbau, Gartenbau wissenschaftliche - Kolloquien, 21. Sept 2004, Grossbeeren.
G. Jerz, Q. Du, X. Hu, A. Körn, O. Nehring, P. Winterhalter; Isolierung bioaktiver Inhaltsstoffe aus chinesischem Gemüse und Arzneipflanzen mittels ‘High speed countercurrent chromatography’.

Deutscher Botanikertag in Braunschweig, 5.-10. Sept. 2004.
G. Jerz, R. Waibel, H. Achenbach; Chemotaxonomic relevant structures from the West-African medicinal tree Ongokea gore (Olacaceae), Abstract book p. 354.

EU Thematik Network, Producers Platform Meeting, Phytohealth-Helsinki 30.-31. Aug.  2004.
G. Jerz, O. Nehring, L.-H. Tseng, M. del R. Ramos, M. Stürtz, Q. Du, P. Winterhalter. Selective detection of isoprenylated flavonoids and other phytoestrogens in plant extracts by LC-ESI/MS, LC-NMR for subsequent ’High-speed countercurrent chromatography’.

3rd International Conference on Countercurrent Chromatography (CCC 2004), 28.-31. Aug. 2004, Tokyo, Japan.
Q. Du, G. Jerz, P. Chen, P. Winterhalter. Preparation of Ursane Triterpenoids from  
Centella asiatica using HSCCC with Step-Gradient Elution.

Walberberg DFG-Workshop 16.-17. July 2004, Verbundprojekte FlavoNet und LipidNet. G. Jerz, P. Winterhalter: Erschliessung neuer Quellen für die Isolierung pharmakologisch aktiver Naturstoffe. 

SINO-GERMAN Symposium – Bioactive compounds and mycotoxins in vegetables as affected by environment and nutrient status - Hangzhou, China, 03.-06. Dec. 2003.
G. Jerz, Q. Du, P. Winterhalter. Isolation, structure elucidation, and biological screening of bioactive natural products from selected traditional vegetables in China’.

CIATEJ, Research Center of Investigation, Technical and Design Assistance of Jalisco State, 27. April 2003, Guadalajara, Mexico.
G. Jerz, Q. Du, P. Winterhalter, Isolation of dammarane saponins from Panax notoginseng by high-speed counter current chromatography.

Regionaltagung Nord der Lebensmittelchemischen Gesellschaft, 24.-25. March 2003 in Hamburg.
Maria del R. Ramos, G. Jerz, S. Villanueva, F. López-Dallamary, P. Winterhalter: Proanthocyanidine aus Avocado-Kernen (Persea americana Mill., Lauraceae). Summary in: Lebensmittelchemie 57, 96 (2003).

CIATEJ, Research Center of Investigation, Technical and Design Assistance of Jalisco State, 20. Feb. 2002, Guadalajara, Mexico.
G. Jerz, Spectroscopical Tools for Structure Elucidation of Unusual Fatty Acids in Plants.


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