用近红外光谱法测定大白菜的营养成分

选用来自我国主要产地的大白菜不同品种及不同成熟期等材料２４２份，进行常规成分的定标和检验。结果表明：粗蛋白、中性纤维、还原糖及维生素Ｃ的近红外（ＮＩＲ）法测值与化学法测值的复相关系数（ＭＲ）分别为０．９９５８、０．９８５２、０．９８２１和０．９８１４，定标的标准误差（ＳＥＣ）分别为０．３９８％、０．１３４％．０．０９８％和０．５１ｍｇ／１００ｇ。用一定数量的检验样品以４种成分化学法与近红外法进行比

Determination of Nutrients in Chinese Cabbage with Near Infrared Spectrometry

This paper described the calibration and prediction of the major nutritional components in 242 samples of Chinese cabbage on a NIRs(Near Infrared spectrophotometer).These samples of different cultivars and mature periods were collected from the main producing area in China.The results showed that the multiple correlation coefficients(MR)between the content values of crude protein(CP),neutral detergent fibre(NDF),reduced sugars(RS)and vitamin C(VC)determined by NIRs and chemical analysis were 0.9958,0.9852,0.9821 and 0.9814,respectively,with the standard errors of calibration(SEC)being 0.398%,0.134%,0.098% and 0.51mg/100g correspondingly.Comparison of each pair of values for each of 4 nutrients,determined by NIRs and chemical analysis respectively showed that the correlation coefficients between the above methods for the 4 nutrients were 0.994,0.978, 0.974,and 0.981,with the standard error of prediction(SEP) being 0.353%,0.127%,0.108%,and 0.548mg/100g respectively.This indicates that NIRs is comparable to chemical methods in both accuracy and precision and is a reliable method for the determination of nutrients in Chinese cabbage.