• Title/Summary/Keyword: phenolcarboxylic acid

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Phenolic compounds from Acer ginnala Maxim (신나무의 Phenol성 화합물에 관한 화학적 연구(I))

  • Park, Woong-Yang
    • Korean Journal of Pharmacognosy
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    • v.27 no.3
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    • pp.212-218
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    • 1996
  • Two phenolcarboxylic acids. five flavonoids and one hydrolysable tannin were isolated from the leaves of Acer ginnala Maxim. On the basis of chemical and spectroscopic evidence, the strutures of these compounds were established as gallic acid, ethylgallate, acertannin, quercetin, quercitrin, isoquercitrin, rutin, $quercetin-3-O-{\alpha}-_L-rhamnopyranosyl-2'-gallate$.

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Phenolic Compounds from Acalypha australis L. (깨풀의 Phenol성 화합물에 관한 화학적 연구(I))

  • Park, Woong-Yang;Lee, Sang-Cheol;Ahn, Beung-Tae;Lee, Seung-Ho;Ro, Jai-Seup;Lee, Kyong-Soon
    • Korean Journal of Pharmacognosy
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    • v.24 no.1
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    • pp.20-25
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    • 1993
  • Three phenolcarboxylic acids, two flavonoids and four hydrolysable tannins were isolated from the whole plant of Acalypha australis. On the basis of chemical and spectroscopic evidence, the structures of these compounds were established as gallic acid, protocatechuic acid, caffeic acid, rutin, isoquercitrin, corilagin, furosin and geraniin.

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Inhibitory Effect of Hydrolysable Tannins Isolated from the Euphorbia helioscopia on Mushroom Tyrosinase Activity in vitro (대극과식물 등대풀로부터 분리한 가수분해형 탄닌의 tyrosinase 활성 억제효과)

  • 김진준;이주상;김소영;김정아;정시련
    • YAKHAK HOEJI
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    • v.45 no.2
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    • pp.214-219
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    • 2001
  • Nineteen hydrolysable tannins isolated from the Euphorbia helioscopia (Euphorbiaceae) were tested for the inhibitory effect on mushroom tyrosinase activity in vitro. Inhibitory effect of gallotannin group exhibited more potent than that of phenolcarboxylic acid and ellagitannin groups against the enzyme activity. The inhibitory activity by pentagalloyl glucose on mushroom tyrosinase was more potent ($IC_{50}$/, 4.9 $\mu$M) than that of kojic acid ($IC_{50}$/, 8.7 $\mu$M).

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