Effect of five lactic acid bacteria on the flavor quality of fermented sweet potato juice
Bin Liang, Xue Bai, Yunfan Wang, Xiaohe Li, Yanhui Kong, Xiulian Li, Xiangquan Zeng, Wenli Liu, Huamin Li, Shuyang Sun, Hansheng Gong, Xinguang Fan
Abstract
The purpose of this research was to assess the impact of 5 lactic acid bacteria (LAB), Lactiplantibacillus plantarum, Lacticaseibacillus casei, Streptococcus thermophilus , Lacticaseibacillus rhamnosus and Lactobacillus delbrueckii subsp. bulgaricus on the characteristic flavor of the fermented sweet potato juice. Following the fermentation process, significant variations were observed in the concentrations of sugars, organic acids, as well as the overall volatile aroma compounds. LAB can effectively facilitate the production of volatile organic compounds (VOCs), including acids and ketones, thereby enhancing the aroma quality. Inoculation fermentation by LAB decreased the sweet and nutty odor, and increased fresh, floral, and citrus aroma of the sweet potato juice. The sweet potato juice fermented by 5 lactic acid bacteria strains had different flavor features, while the sample of Lp10 showed the highest overall acceptability. Compared to other strains, L. plantarum exerted a more significant influence on the volatile compounds present in fermented sweet potato juice. • LAB could promote the VOCs in sweet potato juice, including acids and ketones. • LAB decreased sweet, fatty, nutty odor, and increased fresh, floral, citrus aroma. • Lp10 could produce mannitol, giving a more refreshing taste to the sweet potato juice. • L. plantarum could be used as a potential starter culture for sweet potato juice.