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Novel insights into bound Phenolics: Conversion and release of phenolic compounds in lychee pulp by heat pump drying and lactic acid bacterial fermentation

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文献类型：外文期刊

作者： Hou, Fangli ¹ ; Su, Tong ² ; Chen, Yun ² ; Dong, Lihong ³ ; Zhang, Mingwei ³ ; Huang, Fei ³ ;

作者机构： 1.Guangdong Pharmaceut Univ, Teaching & Expt Ctr, Zhongshan 528458, Peoples R China

2.Guangzhou Univ, Sch Chem & Chem Engn, Guangzhou 510006, Peoples R China

3.Guangdong Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Funct Foods, Guangdong Key Lab Agr Prod Proc,Sericultural & Agr, Guangzhou 510610, Peoples R China

关键词： Lactic acid bacteria; Flavonoid; Lychee; Lactobacillus; Fermentation; Phenolic

期刊名称：FOOD RESEARCH INTERNATIONAL （影响因子：8.0；五年影响因子：8.5 ）

ISSN： 0963-9969

年卷期： 2025 年 208 卷

页码：

收录情况： SCI

摘要： The bioactivities of lychee pulp (LP) phenolics have been extensively documented. However, the impact of processing techniques on the phenolics remains unclear. The objective of this study was to investigate the conversion and metabolism of phenolics in LP that was first heat pump-dried and then fermented by lactic acid bacteria. HPLC-DAD analysis revealed that a portion of the free phenolics were converted to bound phenolics during the drying process. It is noteworthy that 4-hydroxybenzoic acid, procyanidin B2, and syringic acid were identified as novel compounds. The HPLC-MS/MS analysis demonstrated that Lactobacillus fermentation facilitated the additional release of polyphenols from dried LP. Seven previously unidentified phenolic compounds, including protocatechuic acid, 4-hydroxyphenylpropionic acid, dihydrocaffeic acid, 3-phenylpropionic acid, 4hydroxyphenylacetic acid, isorhamnetin-3-O-rutinoside, and isoferulic acid, were discovered in samples of mixed strain Lactobacillus fermentation. These findings provide a theoretical foundation for the lychee processing industry.

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