摘要:

HPLC analyses of dry extracts obtained fromPassiflora incarnatarevealed the presence of ten known flavonoids whose structures were characterised by ionspray ioni-zation tandem mass spectrometry; in addition, three unidentified peaks, F1, F2, and F3 appeared in the flavonoid region of the chromatogram. Two components were detected in F3 by on-line HPLC-ISI-MS analysis, named F3a and F3b. F2 was demonstrated to be a structural isomer of schaftoside (1), and F3a of isoschaftoside (2), with apigenin as the common aglycone and molecular weight 564. Mass spectra and 2D-NMR experiments allowed us to assign the structure of 6-β-D-glucopyranosyl-8-β-D-ribopyranosyl apigenin to the new di-C-glycosylflavonoid F2.

ISSN:1057-5634    

DOI:10.1080/10575639808044951

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

From a phytochemical screening ofCalophyllum teysmanniivar.inophylloidea new coumarin, isocalanone (1a), was isolated together with the known calanone (2). The structures of both compounds were confirmed by spec-troscopic data and single crystal X-ray crystallography.

ISSN:1057-5634    

DOI:10.1080/10575639808044952

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

An extract of adult Japanese beetles,Popillia japonicaNewman (Coleoptera: Scarabaeidae), collected in commercial Japanese beetle traps, afforded a large amount (nearly 0.2 mg/g of fresh weight) of cholesterol. As phytophagous insects, Japanese beetles feed on a variety of plants. Since little or no cholesterol can be obtained from their diet, they must be able to utilize phytosterols to generate and store cholesterol.

ISSN:1057-5634    

DOI:10.1080/10575639808044953

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:1057-5634    

DOI:10.1080/10575639808044940

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor