茶生葉の貯蔵　ＸＩＶ　　茶生葉のＣＡ貯蔵中における茶葉成分の変化

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  • Changes of Chemical Constituents in Tea Leaves duringControlled Atmosphere Storage
  • チャセイヨウ ノ CA チョゾウチュウ ニ オケル チャハ セイブン ノ ヘン

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Tea leaves were stored for 10-21 days at 5 or 10°C in the atmosphere of various kinds of N2, O2 and CO2 concentrations; control (air, i.e., N2, 80%; O2, 20%), experiment A (N2, 85%; O2, 10%; CO2, 5%), experiment B (N2, 90%; O2, 5%; CO2, 5%) and experiment C (N2, 93%; O2, 2%; CO2, 5%). Concentrations of N2, O2, CO2 and ethylene in the storage vessel were measured by gas chromatography during the storage.<BR>1) The quantities of the both O2 uptake and CO2 output by respiration of tea leaves were in the order of control, experiment A, experiment B and experiment C during the storage.<BR>2) Ethylene production per day from storaged leaves was measured after the storage of 8 days. As ethylene was produced in the order of control, experiment A, experiment B and experiment C, it was considered that the ethylene production was affected by O2 concentration in the strage atmosphere.<BR>3) The contents of tannin and caffeine were not so much changed during the storage, whereas that of total ascorbic acid was remarkably decreased, especially in the form of reduced ascorbic acid. And it was clear that the decrease of ascorbic acid was affected by O2 concentration. The contents of amino acids such as glutamic acid, aspartic acid, glutamine, asparagine and theanine were changed during the storage but an uniform tendancy was not found.

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