Kinetic evaluation of the formation of tryptophan derivatives in the kynurenine pathway during wort fermentation using Saccharomyces pastorianus and Saccharomyces cerevisiae


YILMAZ C., GÖKMEN V.

FOOD CHEMISTRY, cilt.297, 2019 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 297
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.foodchem.2019.124975
  • Dergi Adı: FOOD CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Kynurenine, Kynurenic acid, Tryptophan, Beer, Fermentation, Multi-response kinetic modeling, LIQUID-CHROMATOGRAPHY, ACID, METABOLITES, HONEY
  • Hacettepe Üniversitesi Adresli: Evet

Özet

This study aimed to evaluate the formation of tryptophan derivatives in the kynurenine pathway during wort fermentation using a multi-response kinetic model and an empirical modified logistic model. Saccharomyces cerevisiae NCYC 88 (ale yeast) and S. pastorianus NCYC 203 (lager yeast) were used to understand the effect of fermentation type on tryptophan derivatives. According to the modified logistic model, tryptophan concentration was critical for the maximum production rate of kynurenic acid, a neuroprotective compound. The results indicated that utilization of tryptophan and kynurenic acid formation were faster in wort fermented with S. cerevisiae than with S. pastorianus. The reaction rate constants implied that the kynurenic acid formation stage was minor compared to other enzymatic reactions leading to NAD(+) synthesis. Multi-response kinetic modeling of kynurenine pathway provided insights into tryptophan derivative formation, which can facilitate improved beer fermentation processing.