Surface waxes from leaves and fruits of walnut英文电子书.pdf

Phytochemistry, Vol. 29, No. 7, pp. 2097-2099, 1990. 003 l-9422/90 $3.00 + 0.00 Printed in Great Britain. 0 1990 Pergamon Press plc SURFACE WAXES FROM LEAVES AND FRUITS OF WALNUT R. B. N. PRASAD and P.-G. Gij~z Botanisches Institut der Universitat zu Koln, Gyrhofstrasse 15, D-5000 Kijln 41, F.R.G. (Received in reoisedform 18 December 1989) Key Word Index--Jug/am regia; Juglandaceae; walnut; leaves; fruit; surface waxes; alkanes; esters; aldehydes; alcohols; fatty acids; juglone. Abstract-The surface waxes from the leaves and fruits of walnut (Juglans regia) exhibited a similar chemical composition with primary alcohols (41.6 and 35.7%) as the major lipid class. The other homologous series present in these waxes were hydrocarbons (3.0 and 15.6%), esters (3.5 and 3.4%), aldehydes (5.5 and 10.0%) and fatty acids (8.4 and 4.7%) in smaller amounts. In addition to these common wax lipids, S-hydroxy-1,4_naphthoquinone (juglone) was identified in the leaf (29.8%) and fruit (28.6%) waxes. INTRODUCTION sisted of homologues of n-alkanes with chain lengths ranging from C,, to C,,. Hentriacontane (32.9 and Juglans is a genus of ca 15 species distributed