Seasonal variations in trans-2-hexenal and linolenic acid in homogenates of Thea sinensis leaves |
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Authors: | Akikazu Hatanaka Tadahiko Kajiwara Jiro Sekiya |
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Affiliation: | Department of Agricultural Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi 753, Japan |
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Abstract: | The seasonal variations in the amounts of C6-volatile components cis-3-hexenal trans-2-hexenal n-hexanal) and their precursors (linoleic and linolenic acid) in homogenates of Thea sinensis leaves were quantitatively analyzed throughout the year. Formation of trans-2-hexenal began in the middle of April and reached a maximum during July. Towards autumn the aldehyde gradually decreased and, in winter (December to March), was virtually absent. The levels of cis-3-hexenol remained constant during May–December. cis-3-Hexenal showed a similar variation pattern to that of trans-2-hexenal. The major fatty acids in the leaves were palmitic, palmitoleic, oleic, linoleic and linolenic acid, and occurred in non-ionic lipids and phospholipid fractions. The amounts of linoleic and linolenic acid did not show any marked variation except for a big peak in October. |
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Keywords: | Theaceae tea seasonal variations linolenic acid. |
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