Possible Confusion of Pyrethrins with Thiophenes in Tagetes species.

Hogstad, Solbjørg; Johansen, Gisle Løhre; Anthonsen, T.; Jernstedt, Karen K.; Norin, Torbjörn

doi:10.3891/acta.chem.scand.38b-0902

Cited by 10 publications

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“…It has been found experimentally that for distinct resolution of lutein derivatives spots (Lu) and that of thiophenes (Th) on a silica TLC-plates the eluent may be composed of n-hexane with small additions of polar solvent -acetone (10 : 0.1÷0.3 vol./vol. ), the sports of Lu may be detected due to yellow color while spots of Th are known to have a bluish fluorescence under UV-excitation (354 nm) [11]. Spots of Th were found at the front of eluent (R f ~ 0.9) (Figure 2 The thiophene spot cannot be unequivocally attributed only to really week sorbate α-T because another thiophene derivative (BBT) also has no polar functional groups.…”

Section: Resultsmentioning

confidence: 99%

Thiophenes of Tagetes Flowers and Partial Purification of Xanthophyll Esters

Дейнека

Tret’yakov²,

Lapshova³

et al. 2014

ujar

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Lutein is a health promoting xanthophyll that may be extracted from marigold flowers. But the plant is known also for biosynthesis of phototoxic polythiophenes. Extracts of flowers of some Tagetes species grown in Belgorod (RF) T. erecta L. (cv. Gavaii) , T. patula L. (cv. Petit orange), T. tenuifolia Cav. (unknown cv.), and T. lucida Cav. were investigated by thin layer chromatography (TLC) and high-performance chromatography (HPLC) with diode-array (DAD) and mass spectomertic detector (MS). It has been found that C 13 bithienyl (instead of C 12 -derivatives being common for hairy roots) was a major thiophene derivative of all extracts under investigation, and that thiophenes are accumulated mainly in the parts of flowers hidden from sunlight by a flower's sepals. Therefore two methods of petal preparation for lutein diesters extraction were investigated. It has been shown that solid phase extraction on silica is a simple way for lutein diesters purification from thiophenes.

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Section: Resultsmentioning

confidence: 99%