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Gu X.,Ningbo University | Gu X.,Ningbo Exit Entry Inspection and Quarantine Bureau Technical Center | Tang H.,Zhejiang Pharmaceutical College | Ou C.,Ningbo University
Journal of Chinese Institute of Food Science and Technology | Year: 2014

The measurement uncertainty of sorbic acid in wine by high performance liquid chromatography (HPLC) was evaluated. According to the procedure for uncertainty assessment described in CNAS-GL06 Guidance on Evaluating the Uncertainty in Chemical Analysis and JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement,the mathematical model was established based on the given testing method, and the components of uncertainty in the measuring process of determining sorbic acid in wine using HPLC method were studied and analyzed, and then the combined uncertainty and the expanded uncertainty were calculated. The results showed that the major factors of uncertainty in measurement of sorbic acid in wine using HPLC method are measurement repeatability and standard solution, and the minor ones are HPLC and the process of diluting samples separately. ©, 2014, Chinese Institute of Food Science and Technology. All right reserved.


Ou C.-R.,Ningbo University | Tang H.-Q.,Ningbo Exit Entry Inspection and Quarantine Bureau Technical Center | Yin J.-Y.,Ningbo Exit Entry Inspection and Quarantine Bureau Technical Center | Cao J.-X.,Ningbo University | And 3 more authors.
Modern Food Science and Technology | Year: 2014

The rapid determination of alcoholicity content in alcoholic beverages by near infrared spectroscopy (NIR) method was studied. The alcoholicity of 100 wine samples was detected by NIR and digital density meter method and the linear measuring range of NIR method was determined. Furthermore, the accuracy of the alcoholicity in other types of alcoholic beverages, such as fermented alcoholic beverages (fruit wine, sake and Chinese rice wine) and distilled spirits (vodka, whisky, brandy, rum and Chinese spirits ) were also investigated by using NIR. The results showed that the actual digital display measuring range was 0~28%vol, and the linear range was 0~20% vol. The alcoholicity in wine samples measured by two different methods showed a good correlation and there was no significant difference through t test (t0.05,4=2.78) and F test (F0.05(2, 2)=19.0) at the level of α = 0.05. The alcoholicity in other types of alcoholic beverages determined by the two methods was consistent in evaluation of conformity. NIR method verified in this study is easy and fast to operate and has good repeatability. It is appropriate for determining alcoholicity in wine samples, and other kinds of alcoholic beverages.

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