Determination of Dextrin Content in Goat Milk Powder by the Nonlinear Chemical Fingerprint Method
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Abstract:
The content of dextrin in goat milk powder could be determined rapidly by the nonlinear chemical fingerprint method with sulfuric acid, malonic acid, ceric ammonium sulfate, sodium bromate, and sodium bromide as the oscillating system. Different amounts of dextrin were added to goat milk powder to prepare standard samples of adulterated goat milk. The total weight of each goat milk powder standard sample was 0.7 g. The nonlinear chemical fingerprints of these standard samples were obtained, and the least square method was used to fit the linear relationship between the induction time and the content of dextrin in the standard samples. Subsequently, the content of dextrin in the adulterated goat milk powder could be calculated. The results showed that within 0~30% range of dextrin content in the adulterated goat milk powder, the dextrin content and the induction time value had a good linear relationship. The correlation coefficient ranged from 0.9991~0.9998, the recoveries were between 94.00%~108.75%, and the relative standard deviations (RSDs) were in the range of 0.31%~1.96%. The determination range of the content of dextrin in goat milk powder was from 0~0.30 g/g, and the detection limits were in the range of 8~9.3 mg/g. The method is simple to use and has a good accuracy. It is a practical and feasible method for determining the content of dextrin in goat milk powder, and can be a potential method to quantitatively analyze other components in complex samples.
