Chagyo Kenkyu Hokoku (Tea Research Journal)
Online ISSN : 1883-941X
Print ISSN : 0366-6190
ISSN-L : 0366-6190
Volume 2018, Issue 126
Displaying 1-6 of 6 articles from this issue
Review
Original Article
  • Yuzo Mizukami
    2018 Volume 2018 Issue 126 Pages 9-15
    Published: December 31, 2018
    Released on J-STAGE: January 01, 2021
    JOURNAL FREE ACCESS

    The odorants contributing to the characteristic aroma of sencha produced in the mountainous area have been investigated by using an aroma extract dilution analysis (AEDA) of the volatile fractions isolated from the sencha infusion by comparing that produced at the flat land. Principal component analysis of the flavor dilution factors of all the detected odorants in the AEDA has revealed that furaneol, (Z)-methyl jasmonate, indole and vanillin were the characteristic odorants of the sencha produced in the mountainous area. Since these odorants were also included in the infusion of sencha produced at the flat land, the characteristic aroma of sencha produced in the mountainous area would be affected by the odorants compositions. The experimental result in this study have been obtained by using limited samples. It would be necessary to analyze more samples, to clarify the aroma of sencha produced in the mountainous area.

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Short Communication
  • Katsutoshi Nishino, Nakao Kubo, Koji Fukunaga, Nobuhiro Hirai
    2018 Volume 2018 Issue 126 Pages 17-23
    Published: December 31, 2018
    Released on J-STAGE: January 01, 2021
    JOURNAL FREE ACCESS

    Aluminum ions, which generally suppress root elongation of plants, are important for the growth of tea plants. We analyzed the concentrations of aluminum complexes in tea leaves and soils from the ‘Yabukita’, ‘Benifuki’ and ‘Benihomare’ tea plantations using 27Al NMR spectrometry. The monthly changes in concentrations of aluminum ions were also examined using local varieties of tea leaves from Kyoto and soils in which the tea plants grow. The complexes (oxalato) aluminate and (citrato) aluminate, Al (SO4)+, and aluminum ions were detected in most samples. Their concentrations in the leaves and soils varied among cultivars and sampling times.

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