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Phenolic profile, free amino acids composition and antioxidant potential of dried longan fermented by lactic acid bacteria

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Abstract

In this study, dried longan pulp (DLP) was subjected to fermentation using selected strains of lactic acid bacteria (Lactobacillus plantarum subsp. Plantarum and Leuconostoc mesenteroides). We then studied changes in the free and bound phytochemical profile, antioxidant activity, free amino acid, and organic acid composition. Fermentation exhibited a 17.4% and 5.7% increase in the amount of free and total phenolic contents of DLP. Phenolic composition determined by HPLC revealed significant changes due to fermentation that were primarily in the contents of gallic acid, vanillic acid, 4-methylcatechol and p-coumaric acid, resulting in a 37.9% and 25.7% increase in free gallic acid and 4-methylcatechol, respectively. Fermentation was also found to enhance the ferric reducing antioxidant power of both free and total and the oxygen radical absorbance capacity of free phenolic fraction by 18.3%, 11.8%, and 37.4%, respectively. In addition, fermentation was observed to reduce the contents of free amino acids with bitter taste (phenylalanine, tyrosine and leucine), and increase amino acids (taurine, aspartic acid, cysteine, cysteine thiazoline and γ-amino-butyric acid) having antioxidant potential. Therefore, this study provides basis for the production of fermented longan-based functional products with improved antioxidant activity.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 31301459), and Guangdong Provincial Science and Technology Project (Grant Nos. 2017B090907022 and 2017B020232002), and Guangzhou Municipal Project of Science and Technology (Grant Nos. 201704020039, 201803020014 and 201803010079).

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Correspondence to Mingwei Zhang.

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Khan, S.A., Liu, L., Lai, T. et al. Phenolic profile, free amino acids composition and antioxidant potential of dried longan fermented by lactic acid bacteria. J Food Sci Technol 55, 4782–4791 (2018). https://doi.org/10.1007/s13197-018-3411-8

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  • DOI: https://doi.org/10.1007/s13197-018-3411-8

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