Nutritional components of wild walnut kernel and fatty acid composition,thermal characteristics of its oil
To promote the comprehensive development and utilization of wild walnut,using wild walnut from Lincang,Yunnan as raw material,the contents of crude fat and crude protein of walnut kernel,the amino acid composition and mineral element content of walnut kernel meal,the tocopherol content,total fatty acid composition and sn-2 fatty acid composition of walnut oil were determined,and the thermal characteristics of walnut oil was analyzed.The results showed that the crude fat content of wild walnut kernel was 44.04%and the crude protein content was 21.63%;7 kinds essential amino acids accounted for 31.47%of the total amino acids content and 9 kinds of medicinal amino acids accounted for 70.97%of the total amino acids content;walnut kernel meal was rich in mineral elements,belonging to high potassium and low sodium food,and the content of Mn was 144.8 μg/g,which was the highest in trace elements,and no heavy metal element was detected;wild walnut oil was mainly composed of 7 fatty acids,and the sn-2 polyunsaturated fatty acid content(70.01%)was higher than that in the total fatty acid(61.48%);γ-tocopherol content in wild walnut oil was the highest,which was 510.10 mg/kg;the low temperature crystallization of walnut oil mainly melted at-30℃ and-13℃,and its rapid pyrolysis temperature was 317-470℃,and the absolute value of the mass loss rate reached the maximum at 416℃.Wild walnut kernel has high nutritional value and extensive exploitation and utilization value.
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