Elemental analysis of Chinese edible nuts by inductively coupled plasma atomic emission spectrometry
This paper describes a simple method for the determination of seven mineral elements in human nutrition by using inductively coupled plasma atomic emission spectrometry (ICP-AES) in edible nut samples. Prior to analysis, decomposition of samples was carried out in a microwave digestion system. In order to verify the accuracy and precision of the proposed method, GBW 07604-Poplar leaves were analyzed. The precision and accuracy of determinations were verified through standard addition experiment. The results indicated that the eight samples analyzed were abundant in mineral elements. Magnesium and calcium were major mineral elements, copper, manganese and nickel were found to be low.
Foods are one of the main sources of mineral elements for human body. Most of metal ions present in foods are bound to specific proteins or enzymes and exert their effects as active or structural centers, command process such as catalysts, substrate binding and activation, transportation and storage (1, 2). Essential mineral elements such as Cu and Zn play an important role in human biology, because they are inadequately or not synthesized in the body (3). Nuts also are called caryopsis, nuts are complex plant foods that are not only rich sources of unsaturated fat (e.g. linolenic acid and linoleic acid), but also contain several nonfat constituents such as plant protein, fiber, micronutrients, plant sterols, and phytochemicals (4-6). Nuts are a ver