| Nine Cyperus esculentus samples were collected from seven provinces in China. The impurities, kernel measure, bulk density, thousand grain weight, seed coat color, nut color, kernel shape, crude fat content, crude fiber content, crude protein content, water content and ash content of Cyperus esculentus and acid value, peroxide value, fatty acid composition of Cyperus esculentus oil were determined to analyze the quality difference of Cyperus esculentus from different origins. The results showed that the kernel measure of Cyperus esculentus from different origins showed large differences, in which the large kernel measure was 10-15 mm and the small kernel measure was 6-10 mm. There was also large differences in thousand grain weight corresponding to the kernel measure, which was 362-821 g. Regardless of the size of the kernel measure, the difference in bulk density of Cyperus esculentus was small,which was 580-621 g/L. The contents of water, ash, crude fat, crude protein and crude fiber in Cyperus esculentus were 543%-10.92%, 1.63%-3.11%,18.71%-26.71%,4.66%-8.46% and 664%-1100%, respectively. The main fatty acid of Cyperus esculentus oil was oleic acid (67.71%-7460%), palmitic acid (12.42%-14.78%), linoleic acid (8.79%-12.01%), stearic acid (237%-4.91%), and the acid value and peroxide value of crude oil were 1.06-3.46 mgKOH/g and 0.02-0.92 g/100 g respectively. |
