1. Characterisation of odorant compounds and their biochemical formation in green tea with a low temperature storage process.
- Author
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Katsuno T, Kasuga H, Kusano Y, Yaguchi Y, Tomomura M, Cui J, Yang Z, Baldermann S, Nakamura Y, Ohnishi T, Mase N, and Watanabe N
- Subjects
- Food Storage, Gas Chromatography-Mass Spectrometry, Temperature, Camellia sinensis chemistry, Odorants analysis, Plant Extracts chemistry, Tea chemistry
- Abstract
We produced low temperature (15 °C) processed green tea (LTPGT) with higher aroma contents than normal green tea (Sencha). Normal temperature processed green tea (NTPGT), involved storing at 25 °C, and Sencha had no storing process. Sensory evaluation showed LTPGT had higher levels of floral and sweet odorants than NTPGT and Sencha. Aroma extract dilution analysis and gas chromatography-mass spectrometry-olfactometry indicated LTPGT had 12 aroma compounds with high factor dilution values (FD). Amongst LTPGT's 12 compounds, indole, jasmine lactone, cis-jasmone, coumarin, and methyl epijasmonate contributed to floral, fruity and sweet characters. In particular, indole increased initially, peaking at 16 h, then gradually decreased. Feeding experiments suggested [(15)N]indole and [(15)N]oxygenated indoles (OX-indoles) were produced from [(15)N]anthranilic acid. We proposed the increase in indole was due to transformation of anthranilic acid during the 16 h storage and the subsequent decline in indole level was due to its conversion to OX-indoles., (Copyright © 2013 Elsevier Ltd. All rights reserved.)
- Published
- 2014
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