IDENTIFICATION AND QUANTIFICATION OF MAJOR TRIACYLGLYCEROLS IN SELECTED SOUTH AFRICAN VEGETABLE OILS BY ~(13C) NMR SPECTROSCOPY

摘要

Vegetable oil production has increased significantly in South Africa in the last decade, due to the use of these oils in the food and cosmetics industry. Apart from olive oils, locally produced oils such marula, apricot kernel, avocado pear, grape seed, macadamia nut, and mango kernel oils are sold for human consumption and widely used in the in the making of handcreams, shampoos and other cosmetic products. Quantitative proton decoupled ~(13C){~1H}NMR has been extensively used for the study of olive oils by several groups in order to determine the geographical origin or cultivar variety of the oil, as well as their authentication (1-4). We have become interested in the use of ~(13C){~1H} NMR for the determination of major components of South African extra-virgin olive oils particularly the possible detection of adulteration and studying variations is these components as a function of geographic and cultivar origin of olive oils (5).