Detection and quantification of some phenolic compounds in kernel of selected Hungarian and Bulgarian Persian walnut cultivars

摘要

The Persian walnut (Juglans regia L.) is the most grown nutritional crop among the shell fruit species in Central and Eastern Europe. Some phenolic compounds of kernel of sixteen Persian walnut cultivars derived from Hungary, Bulgaria, and France were examined during two vegetation seasons in this paper. The vanillic acid, catechin, pyrocatechin, epicatechin, rutin, cinnamic acid, gallic acid, syringic acid, and juglone were detected in the samples. If the phenolic compounds are ranked into increasing order, the vanillic acid was in the first place because of its high concentration, followed by catechin, pyrocatechin, epicatechin, rutin, cinnamic acid, gallic acid, syringic acid, and juglone. The Hungarian-bred cultivars, collected in Hungary, produced higher quantity of the examined compounds than the Bulgarian-bred cultivars, derived from Bulgaria, in this study.