The reaction of thioglycolic acid with polyflavanoid bark fractions of Tsuga heterophylla

Sears, Karl D.; Casebier, R. L.

doi:10.1016/s0031-9422(00)85281-4

Cited by 21 publications

(5 citation statements)

References 6 publications

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“…Therefore, it is possible that the catechin moieties in these outer-bark polymers may have resulted from epimerization during the many years of storage in the outer bark. However, much higher proportions of catechin units are indicated in polymers from Douglas-fir bark (Karchesy et al, 1976) and western hemlock bark (Sears and Casebier, 1970), which have epicatechin to catechin ratios of 3:1 and 1:1. The optical rotations of the thioglycolates obtained from these polymers were not reported.…”

Section: I'v/ 'mentioning

confidence: 99%

Loblolly pine bark polyflavanoids

Karchesy¹,

Hemingway²

1980

J. Agric. Food Chem.

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Section: I'v/ 'mentioning

confidence: 99%

Loblolly pine bark polyflavanoids

Karchesy¹,

Hemingway²

1980

J. Agric. Food Chem.

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“…132 This reaction was discussed by Sears and Casebier. 198 In scheme 1, we illustrate the application of this reaction to myricetin-3-rhamnoside. 102 Carob extracts are being studied in recent years for gastroprotective activities, and they were found highly active, so far.…”

Section: Discussionmentioning

confidence: 99%

CAROB (Ceratonia siliqua): HEALTH, MEDICINE, CHEMISTRY

Azab¹

2017

ECB

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“…While inoculation with B. mucronatus also resulted in production of phenols by the host, the response was much less dramatic. Tannins in bark of conifers are mainly condensed ones (Okamura, 1961;Sogo and Hata, 1967) and are polymers of flavanols such as catechin (Karchesy et al, 1976;Sears and Casebier, 1970). In the HPLC-chromatograms, the retention time of catechin coincides with that of the peak-1, the highest peak found in the chromatograms for pine metabolites.…”

Section: Discussionmentioning

confidence: 99%

Abnormal metabolites in pine wood nematode-inoculated Japanese black pine

Futai

2003

Jpn. J. Nematol.

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Abnormal metabolites in pine wood nematode-inoculated Japanese black pine Kazuyoshi FutailSpectrophotometer, paper chromatography, and liquid chromatography were used to isolate and characterize the substances associated with tissue browning of Japanese red pine, (Pinus densiflora) and Japanese black pine (P. thunbergii) inoculated with Bursaphelenchus xylophilus or B. mucronatus. Discoloration, as determined by optical density, and numbers of B. xylophilus was highest near the inoculation site and decreased with increasing distance from that point. Absorption spectra of water extracts from pines infected with B. xylophilus had a distinct peak at 278 nm. The absorption at 278 nm decreased when the extract was oxidized and shifted to 287 nm when 1N NaOH was added, suggesting that the extract contained polyphenolic substances. The increase in browning with increase in nematode population indicates that these substances were related to the nematode infection. B. xylophilus-inoculated seedlings contained much greater amounts of phenolics than B. mucronatus-inoculated and control seedlings. A catechin-like substance was the most abundant polyphenolic associated with large numbers of B. xylophilus. Changes in the amount of condensed tannin, the polymer of catechin, were surveyed in relation to the numbers of nematodes in pine seedlings. Jpn. J. Nematol. 33 (2), 45-56 (2003).

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The reaction of thioglycolic acid with polyflavanoid bark fractions of Tsuga heterophylla

Cited by 21 publications

References 6 publications

Loblolly pine bark polyflavanoids

Loblolly pine bark polyflavanoids

CAROB (Ceratonia siliqua): HEALTH, MEDICINE, CHEMISTRY

Abnormal metabolites in pine wood nematode-inoculated Japanese black pine

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