Search

Near infrared hyperspectral imaging (NIR‐HSI) with a spectral range of 900 to 1700 nm was for the first time used to predict the changes of sugar content in Lingwu jujube during storage. Monte Carlo method was adopted to detect outliers, and multiple scattering correction (MSC), standard normal variate transformation (SNV), and Baseline were used to optimize modeling. Competitive adaptive reweighted sampling (CARS), interval variable iterative space shrinkage approach (iVISSA), and interval random frog (IRF) were used to select optimal wavelengths. In addition, partial least square regression (PLSR) and support vector machine (SVM) modeling based on optimal wavelengths were compared. The results showed that 30, 30, and 24 wavelengths were selected by CARS; 106, 87, and 112 feature wavelengths were selected by iVISSA; and 96, 71, and 83 optimal wavelengths were selected by IRF for sucrose, fructose, and glucose, respectively. The CARS–PLSR models provided the best results for fructose and glucose, and iVISSA–SVM model was better for sucrose. The results indicated that NIR–HSI model may be used as a rapid and nondestructive method for the determination of sugar content in jujubes. [ABSTRACT FROM AUTHOR]

In this study, the ENVI 4.6 software was used to obtain the spectral reflection value of samples. The outlier samples were eliminated by the Monte Carlo method, and then SPXY (sample set partitioning based on be x–y distances) was used to divide the calibration set and prediction set. The spectral images were pretreated and characteristic wavelengths were extracted. The spectral models of full and pretreated spectra and characteristic bands were established by partial least squares regression (PLSR) and principle component regression (PCR), and the optimal modeling combination was selected. The results showed that the modeling effect of the original spectrum was the best. In full‐PLSR model, the determination coefficient of the calibration set (Rc2), the determination coefficient of prediction set (Rp2), and the determination coefficient of interactive verification set (Rcv2) were 0.8804, 0.7375, and 0.7422, and root‐mean‐square error of calibration set (RMSEC), root‐mean‐square error of prediction (RMSEP), and root mean square error of interactive validation set (RMSECV) were 2.3630, 2.9607, and 3.4209, respectively. PLSR and PCR models were established to obtain the optimal models of CARS‐PLSR and PCR‐PLSR. In the CARS‐PLSR model, the Rc2, Rp2, and Rcv2 were 0.9135, 0.7654, and 0.8171, respectively, while RMSEC, RMSEP, and RMSECV were 2.0275, 2.9306, and 2.9262, respectively. In the iRF‐PCR model, Rc2, Rp2, and Rcv2 were 0.7952, 0.7372, and 0.7280, respectively, while RMSEC, RMSEP, and RMSECV were 3.0207, 2.8278, and 3.4288, respectively. This study has demonstrated that visible and near‐infrared hyperspectral imaging system can rapidly predict the content of metmyoglobin in cooked tan mutton. Practical Application: This study has demonstrated that visible and near‐infrared (Vis/NIR) hyperspectral imaging system can rapidly predict the content of MetMb in cooked tan mutton. With the advantages of nondestructive, rapid, real‐time, Vis/NIR, hyperspectral imaging system can be widely expanded and applied to the detection of myoglobin in meat to evaluate the color of meat. [ABSTRACT FROM AUTHOR]

This study aimed to investigate the effects of a combination of acidic electrolyzed water (AEW) and modified atmosphere packaging (MAP) on the quality of jujube stored at 1 ± 0.5°C for 40 days. Jujube was treated with AEW + MAP, AEW, and MAP, respectively, to identify an appropriate preservation method based on the changes of quality indicators, activities of antioxidant enzymes and nonenzymatic antioxidant systems, malondialdehyde (MDA) content, and cell membrane permeability. Results showed that the combined treatment maintained higher storage quality of jujube than the other three treatments. The combined treatment significantly suppressed softening, weight, and color loss and maintained total soluble solid and titratable acidity. Moreover, the combined treatment improved antioxidant capacity showing high levels of nonenzymatic antioxidant systems (ascorbic acid and 1,1‐diphenyl‐2‐picrylhydrazyl radical scavenging capacity), and the activities of antioxidant enzymes (ascorbate peroxidase, superoxide dismutase, and catalase). These effects remarkably suppressed the increase of MDA level and cell membrane permeability, thereby inhibiting oxidative damage and alleviating quality deterioration. Furthermore, kinetic model indicated that AEW + MAP decreased rate constant of quality deterioration. Principal component analysis also showed that AEW + MAP treatment alleviated quality deterioration, with higher comprehensive score than other treatments. In summary, AEW + MAP was an effective preservation method to maintain storage quality and delay postharvest senescence of jujube. Practical Application: In this study, a combination of acidic electrolyzed water (AEW) with modified atmosphere packaging (MAP) has been found to have effective preservation effects on jujube. AEW + MAP treatment improved quality of jujube during cold storage mainly by enhancing antioxidant capacity. The combined treatment may provide a new preservation technology for jujube. [ABSTRACT FROM AUTHOR]