Assessment of Quality and Aroma Characteristics of Kefir Produced by Using Grain and Lyophilized Culture

Year 2021, Volume: 7 Issue: 3, 343 - 357, 25.09.2021

İrem Şen Dağ , Buket Güneşer , Yonca Yuceer

https://doi.org/10.28979/jarnas.907107

Cited By: 1

Abstract

Kefir is traditionally produced using kefir grains, while lyophilized culture is widely used in industry. Microbial fermentation of kefir has critical importance on its aromatic profile and sensory attributes as well as its physicochemical parameters. The main objective of this study was to compare the differences between some physical, chemical, microbiological, sensory attributes and volatile components in kefir fermented with kefir grains and lyophilized cultures during storage. The compositional characteristic of kefir cultured by both kefir grains and lyophilized starter were monitored during 21-day storage in this study. In contrast to dramatic decreases in titratable acidity, serum separation and Streptococcus spp. count, an increase in the amount of various aroma compounds including 2-heptanone, butyric acid, hexanoic acid and octanoic acid was observed during storage of kefir samples. Incubation with lyophilized starter culture promoted kefir’ sensory and rheological attributes besides of improving its diacetyl and acetic acid aroma intensities compared with that incubation with kefir grain. “Sour”, “sweet”, “salty” and “bite (CO2)” were developed as taste terms, while “cooked” “creamy”, “fermented”, “dairy” and “yeast” were some aromatic terms for kefir samples developed by sensory evaluation. Consumer acceptance scores of the kefirs produced by using lyophilized cultures were higher than samples with grain.

Keywords

Aroma-active compound, kefir, kefir grain, lyophilized starter culture, sensory analysis

Supporting Institution

The Scientific Research Fund of Canakkale Onsekiz Mart University

Project Number

Project No: FLY-2014-339

Thanks

The Scientific Research Fund of Canakkale Onsekiz Mart University (Project No: FLY-2014-339) funded this project.

References

• Ahmed, Z., Wang, Y., Ahmad, A., Khan, S. T., Nisa, M., Ahmad, H., & Afreen, A. (2013). Kefir and health: A contemporary perspective. Critical Reviews in Food Science and Nutrition, 53, 422-434. DOI: https://www.tandfonline.com/doi/abs/10.1080/10408398.2010.540360