Quant presentation.docx - Our prediction of protein in the...

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Our prediction of protein in the milk in general was inferior with that of fat, the correlation coefficient was 0.935 and obtained 800-1100 nm region but we found that we narrowed the region into the 900-1100 nm region. In figure 4A shown is the result of the cross validation fromthe 900-1100 nm by using 100 samples, the correlation coefficient is markedly improved compared to the previous 700-1100 nm region of the NIR spectra of 258 milk samples. 4B illustrates Y residual validation variance vs the number of PLS used, in plot 4B we find that most Y variation is explained by lower principal components. The First two loading weights (fig 5A) reveal that almost all of spectral variance is connected with 22% of the protein content and a negligible part of the spectral variations cover 70% of the protein concentration data mainly in the 3rd-5thholdings (Fig 5A and 5B). the intensive bands at 936 and 1018 nm in the 1Stand 2ndare weakly related with proteins in the max at 906, 946, 972, and 1025 nm in the 3rd, 946, 996, and 1032 nm in the 4th

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