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Analysis of the aroma change of instant green tea induced by the treatment with enzymes from Aspergillus niger prepared by using tea stalk and potato dextrose medium
Author(s) -
Zhu Yan Bing,
Zhang Zhen Zhen,
Yang Yuan Fan,
Du Xi Ping,
Chen Feng,
Ni Hui
Publication year - 2017
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.3402
Subject(s) - aroma , chemistry , aspergillus niger , food science , fermentation , limonene , camellia sinensis , carvone , stalk , botany , essential oil , horticulture , biology
The effects of two crude enzymes from Aspergillus niger on the aromas of instant green tea have been investigated. The crude enzymes from tea stalk (ETS) and potato dextrose (EPD) were respectively prepared by fermentation. Both enzyme extracts significantly changed the volatile composition and aroma profile. ETS treatment increased the content of 2‐ethylfuran, ethyl 2‐methylbutyrate and decanal and decreased the content of trans ‐limonene oxide and 2‐heptanone; EPD treatment increased the concentrations of 2‐ethylfuran and ethyl 2‐methylbutyrate and decreased the concentrations of octanal, methyl salicylate and trans ‐limonene oxide. After ETS treatment, the floral and fermented notes increased, while green, woody and sweet notes decreased. EPD treatment decreased green and floral notes. These results indicate that both ETS and EPD contain some novel enzymes, which could modulate the aroma of instant green tea, and thus provide potential enzyme resources for modulating the aroma of tea products.