冷鮮豬肉新鮮度的三維熒光光譜無(wú)損檢測(cè)方法
[Abstract]:China is a big country of pork production and consumption in the world. Cold and fresh pork products are the main form of pork consumption in China. Among many nondestructive detection methods for pork freshness, fluorescence spectroscopy has attracted the attention of scholars at home and abroad for its good specificity, high sensitivity, fast, nondestructive and low detection cost. A new fluorescence spectroscopy technique has been developed in the past 30 years to obtain fluorescence intensity results when excitation and emission wavelengths change simultaneously. In this paper, the original three-dimensional fluorescence spectra of chilled pork were analyzed firstly, and then the original three-dimensional fluorescence of chilled pork was separated by parallel factor method. Based on the separated fluorescent components, the characteristic excitation emission matrix was constructed. Finally, the classification of freshness and the non-destructive detection methods of physical and chemical indexes (volatile base nitrogen, thiobarbituric acid and pH) of freshness of chilled pork were studied by chemometrics. The results show that: 1) There are three fluorescence peaks in the original three-dimensional fluorescence spectrogram of chilled pork, which are called A, B and C. The excitation wavelength (lambda Ex) and emission wavelength (lambda Em) ranges are: lambda Ex = 250-310 nm, lambda Em = 300-400 nm, respectively. The fluorescence peak A of lean meat and fat meat showed similar changing trend: the peak A of lean meat and fat meat decreased rapidly at the beginning of 2 days and slowly at the beginning of 2-4 days; the fluorescence peak B of lean meat and fat meat changed slightly during the experiment period at 4 C, and the fluorescence peak B of lean meat and fat meat decreased as a whole. The variation trend was similar: the peak value of fluorescence B increased slowly in the first two days and rapidly in the second to fourth days at 20 C storage, and changed little during the experimental period at 4 C storage, and showed an overall upward trend. (2) The separation methods of fluorescence components in the original three-dimensional fluorescence spectra of chilled pork were studied, and the fluorescence response of chilled pork to the previous studies was also studied. Five main fluorescent components (C1, C2, C3, C4, C5) were separated from the original three-dimensional fluorescence spectra of chilled pork by parallel factor analysis, and their corresponding fluorescence peaks were located at: lambda Ex = 260-320 nm, lambda Em = 300-400 nm, lambda Ex = 290-320 nm, lambda mE300-400 nm, lambda Ex = 260-440 nm, lambda Em = 360-500 nm, lambda Ex = 390-320-400 nm, respectively. 480 nm, lambda Em = 420-550 nm, lambda Ex = 440-500 nm, lambda Em = 470-550 nm. According to the existing literature, the fluorescent components C1-C4 are tryptophan, vitamin B6, reduced coenzyme (NADH) and riboflavin, respectively, but the fluorescent components C5 (lambda Ex = 440-500 nm, lambda Em = 470-550 nm) are unknown for the time being. (3) The SVM and PLS classification methods are compared with different modeling excitation methods. The results showed that: 1) The single excitation wavelength matrix constructed by the same fluorescent component was used as input variable, and the classification effect of the PLS method was better than that of the SVM model. When the matrix (XEx5) was categorical input variables, the overall classification accuracy of the established SVM and PLS chilled pork freshness detection models was the highest in the overall classification rate. In the classification model of PLS fresh pork freshness based on the matrix of different excitation wavelengths, the multiple excitation matrix (XC5) constructed by fluorescence component C5 was used as the input variable, and the chilled pigs were established as the input variables. The accuracy of the model was the highest..2 The prediction set of meat freshness classification model had the highest overall classification accuracy of 87.9%. (4) The effects of SMLR and PLSR quantitative analysis methods combined with different modeling excitation emission matrices on the quantitative analysis results of fresh pork freshness indices (TVB-N, TBA and pH) were compared. The model established by PLSR method is better than that established by SMLR method. 2) The model based on the multi-excitation wavelength matrix (Xc4) constructed by fluorescent component C4 is the most suitable for quantitative analysis of TVB-N content (rp). The total excitation wavelength matrix (Xall) constructed by all fluorescent components was used as the modeling matrix. The PLSR method was most suitable for quantitative analysis of TBA and pH values (rp 0.80, 0.90, RMSEP 0.0316 mg/kg, 0.2789, respectively).
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:O657.3;TS251.51
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