嗜酸乳杆菌
共轭亚油酸
发酵
食品科学
益生菌
动物双歧杆菌
双歧杆菌
化学
亚油酸
细菌
生物
生物化学
乳酸菌
脂肪酸
遗传学
作者
Saber Amiri,Reza Rezaei Mokarram,Mahmoud Sowti Khiabani,Mahmoud Rezazadeh Bari,Mohammad Alizadeh Khaledabad
标识
DOI:10.1016/j.lwt.2020.109933
摘要
In this study, the fermentation conditions for in situ production of conjugated linoleic acid (CLA) by Bifidobacterium lactis BB12 and Lactobacillus acidophilus LA5 in a milk model medium were optimized. Box–Behnken and combined designs were implemented to find a predictive model for the in situ bioconversion of CLA by pure B. lactis BB12, L. acidophilus LA5, as well as their co-culture. The results showed that under optimal conditions, CLA biosynthesized by B. lactis BB12 and L. acidophilus LA5 are 110.03 ± 4.58 μg/ml and 82.42 ± 3.66 μg/ml, respectively. The functional groups of the produced CLA were also analyzed by Fourier-transform infrared spectroscopy, which confirmed the typical characteristics of long-chain fatty acids. Gas chromatography–mass spectrometry analysis further showed that both isomers of CLA (cis-9, trans-11 and trans-10, cis-12) were biosynthesized by B. lactis BB12 and L. acidophilus LA5 in supplemented cheese whey. This study indicated the most important factors affecting the fermentation bioprocess for biosynthesis of CLA by B. lactis BB12 and L. acidophilus LA5 in a low-cost food-grade medium. The findings of this study also showed that pure B. lactis BB12 and L. acidophilus LA5 have a good ability to produce bioactive CLA, but the co-culture of these two commercial probiotics have no synergistic effect on biosynthesis of CLA.
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