Analysis of lipophilic compounds of tea coated on the surface of clay teapots

Tse Yu Chung, Ping-Chung Kuo, Zih Hui Liao, Yu En Shih, Mei Lin Yang, Mei Ling Cheng, Chia Chang Wu, Jason T.C. Tzen

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The surface of a clay teapot tends to be coated with a waterproof film after constant use for tea preparation. The waterproof films of two kinds of teapots (zisha and zhuni) used for preparing oolong tea and old oolong tea were extracted and subjected to gas chromatography-mass spectrometry analysis. The results showed that comparable constituents were detected in these films; they were primarily fatty acids and linear hydrocarbons that were particularly rich in palmitic acid and stearic acid. To explore the source of these two abundant fatty acids, the fatty acid compositions of fresh tea leaves, granules, infusion, and vapor of infusion were analyzed by gas chromatography. Fresh tea leaves were rich in palmitic acid (C-16:0), unsaturated linolenic acid (C-18:3), linoleic acid (C-18:2), and oleic acid (C-18:1), which were presumably from the phospholipid membrane. During the process of manufacturing oolong tea, the three unsaturated fatty acids may be substantially degraded or oxidized to stearic acid (C-18:0), which was enriched with palmitic acid in the tea granules and in the infusion. The vapor of the tea infusion is primarily composed of palmitic acid and stearic acid. Thus, the coated films of teapots mostly originated from the lipophilic compounds of the tea infusions.

Original languageEnglish
Pages (from-to)71-81
Number of pages11
JournalJournal of Food and Drug Analysis
Volume23
Issue number1
DOIs
Publication statusPublished - 2015 Mar 1

Fingerprint

Tea
tea
clay
palmitic acid
films (materials)
Palmitic Acid
stearic acid
vapors
granules
Fatty Acids
fatty acids
linolenic acid
unsaturated fatty acids
oleic acid
hydrocarbons
linoleic acid
leaves
manufacturing
phospholipids
alpha-Linolenic Acid

All Science Journal Classification (ASJC) codes

  • Food Science
  • Pharmacology

Cite this

Chung, T. Y., Kuo, P-C., Liao, Z. H., Shih, Y. E., Yang, M. L., Cheng, M. L., ... Tzen, J. T. C. (2015). Analysis of lipophilic compounds of tea coated on the surface of clay teapots. Journal of Food and Drug Analysis, 23(1), 71-81. https://doi.org/10.1016/j.jfda.2014.05.005
Chung, Tse Yu ; Kuo, Ping-Chung ; Liao, Zih Hui ; Shih, Yu En ; Yang, Mei Lin ; Cheng, Mei Ling ; Wu, Chia Chang ; Tzen, Jason T.C. / Analysis of lipophilic compounds of tea coated on the surface of clay teapots. In: Journal of Food and Drug Analysis. 2015 ; Vol. 23, No. 1. pp. 71-81.
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Chung, TY, Kuo, P-C, Liao, ZH, Shih, YE, Yang, ML, Cheng, ML, Wu, CC & Tzen, JTC 2015, 'Analysis of lipophilic compounds of tea coated on the surface of clay teapots', Journal of Food and Drug Analysis, vol. 23, no. 1, pp. 71-81. https://doi.org/10.1016/j.jfda.2014.05.005

Analysis of lipophilic compounds of tea coated on the surface of clay teapots. / Chung, Tse Yu; Kuo, Ping-Chung; Liao, Zih Hui; Shih, Yu En; Yang, Mei Lin; Cheng, Mei Ling; Wu, Chia Chang; Tzen, Jason T.C.

In: Journal of Food and Drug Analysis, Vol. 23, No. 1, 01.03.2015, p. 71-81.

Research output: Contribution to journalArticle

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T1 - Analysis of lipophilic compounds of tea coated on the surface of clay teapots

AU - Chung, Tse Yu

AU - Kuo, Ping-Chung

AU - Liao, Zih Hui

AU - Shih, Yu En

AU - Yang, Mei Lin

AU - Cheng, Mei Ling

AU - Wu, Chia Chang

AU - Tzen, Jason T.C.

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AB - The surface of a clay teapot tends to be coated with a waterproof film after constant use for tea preparation. The waterproof films of two kinds of teapots (zisha and zhuni) used for preparing oolong tea and old oolong tea were extracted and subjected to gas chromatography-mass spectrometry analysis. The results showed that comparable constituents were detected in these films; they were primarily fatty acids and linear hydrocarbons that were particularly rich in palmitic acid and stearic acid. To explore the source of these two abundant fatty acids, the fatty acid compositions of fresh tea leaves, granules, infusion, and vapor of infusion were analyzed by gas chromatography. Fresh tea leaves were rich in palmitic acid (C-16:0), unsaturated linolenic acid (C-18:3), linoleic acid (C-18:2), and oleic acid (C-18:1), which were presumably from the phospholipid membrane. During the process of manufacturing oolong tea, the three unsaturated fatty acids may be substantially degraded or oxidized to stearic acid (C-18:0), which was enriched with palmitic acid in the tea granules and in the infusion. The vapor of the tea infusion is primarily composed of palmitic acid and stearic acid. Thus, the coated films of teapots mostly originated from the lipophilic compounds of the tea infusions.

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