ANALYTICAL CHEMISTRY
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2019
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IF 6.35
Yanhui Zhong,Yufei Hu,Gongke Li,Runkun Zhang
Identification of complex samples presents a difficult challenge for modern analytical techniques, and the differentiation among closely similar mixtures often remains indeterminate. In this article, we designed a simplified cyclic chemiluminescence (CCL) system that is able to measure multistage signals in a single sample injection. The system was used to investigate the CCL reactions of the binary, ternary, and multicomponent mixtures. Results showed that each mixture has a unique exponential decay equation (EDE) with a constant decay coefficient (k-value) to describe the change law of its multistage signals. Further studies found that different brands of liquor, beer, toner, and baby powder have different k-values, and the same brand of the commodities between different batches have the same k-values, which allows facile identification of these complex samples. We then used different catalysts to design digital codes of the k-value for further improving the identifying ability of CCL. Moreover, the multistage signals are like fingerprints and could be used for linear discriminate analysis, which provides another complementary approach for identification of complex samples. Finally, we demonstrated that CCL shows potential applications in certification and quality assurance according to the change of the k-values of the sample. This work demonstrates that excellent discrimination ability of CCL for the identification of complex samples and provides a promising technology for quality assurance.
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 5
·3438-3450
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IF 3.006
Liu Yan,Wang Chao,Xia Zhenzhen,Wang Qiao,Duan Shuo
A method for monitoring the freshness of crayfish by near-infrared spectroscopy combined with chemometrics was proposed in this study. The total volatile basic nitrogen (TVBN), K value and biogenic amine were adopted as the indexes of freshness. The 120 peeled and the 120 whole tail samples were utilized to build the quantitative models by partial least squares (PLS) regression, respectively. The spectral pretreatment and the variable selection methods were adopted to further improve the models. For the models of TVBN and K value, the combination of continuous wavelet transform (CWT) and randomization test (RT) method could improve the predictability effectively. The combination of 1st derivative and RT method could get better results for the optimization of the biogenic amine models. The optimized models were evaluated by 40 peeled and the 40 whole tail samples, and then utilized to predict the three indexes in another 32 peeled tails and 40 whole tail samples for practical application. Reasonable results were obtained for the samples with TVBN levels ranging from 28.01 mg/kg to 284.89 mg/kg, K value levels ranging from 13.04 to 87.36% and biogenic amines ranging from 148.57 mg/kg to 663.71 mg/kg. For the TVBN, K value and biogenic amine in the 32 peeled tail samples, the correlation coefficients between the results calculated by the optimized models and those measured by the standard methods were 0.95, 0.94 and 0.96 respectively. As to the three freshness indexes in 40 whole tail samples, the correlation coefficients were 0.95, 0.93 and 0.94, respectively.
研究领域:
食品科学
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光谱学
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化学计量学
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DOI
高影响因子
FOOD CHEMISTRY
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2022
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IF 9.231
Okon Johnson Esua,Da-Wen Sun,Jun-Hu Cheng,Ji-Lin Li
The effects of the treatment (UPFL) combining ultrasound (US) with plasma functionalized liquids (PFL) were evaluated on the quality of vacuum-packaged silver Pomfret stored at 4 ℃ for 15 days. Conformational modifications in myofibrillar proteins, improvements in nutritional value and biomedical index of fatty acids and lipids, reduced pH of 5.70, increased K -value, TBARS, and TVB-N at values of 12.05%, 0.576 mg MDA/kg, and 9.15 mg N/100 g, respectively, and 1.99 log reductions in spoilage microorganisms were evident immediately after treatments. UPFL presented better quality preservative effects when compared with individual applications of US or PFL, and vacuum packaging ensured optimal quality enhancement effects such as stability of myofibril fragmentation, inhibition of physicochemical quality degradation, and microbial growth control. The results also revealed the predominant cultivable spoilage microbiota of vacuum-packaged silver Pomfret treated with UPFL, providing valuable information towards developing broad-spectrum sanitisers and hurdle technology for the seafood industry.
研究领域:
食品科学
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海洋生物学
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微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD SCIENCE
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2020
·Vol. 85
·期 4
·1037-1044
·
IF 2.479
Yongxia Xu,Yiming Yin,Tao Li,Honglei Zhao,Xuepeng Li,Jianrong Li,Tong Sun
Effects of lysozyme (LYS) combined with cinnamaldehyde (CA) on quality enhancement of olive flounder ( Paralichthys olivaceus ) fillets during refrigerated storage at 4 °C for 20 days were assessed. Changes of total viable count (TVC), K -value, total volatile basic nitrogen (TVB-N), thiobarbituric acid (TBA), texture profile analysis (TPA), and trichloroacetic acid-soluble peptide (TCA-soluble peptide) in samples were determined periodically. Results demonstrated that the combination of LYS and CA treatment enhanced the antibacterial activity against S. putrefaciens and P. fluorescens , and lowered TVC values. Meanwhile, LYS combined with CA significantly retarded the increases of TBA value, TVB-N, K -value, and TCA-soluble peptide content compared to the control. Furthermore, the combined treatment also effectively maintained the texture properties of flounder fillets during the storage period. The efficiency was better than that of LYS or CA treatment alone. Thus, LYS combined with CA is promising in olive flounder shelf life extension.
研究领域:
食品科学
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水产养殖
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Quality and Safety
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2023
·
IF 5.6
Xu Zhilong,Pei Juxin,Mei Jun,Yu Huijie,Chu Siyuan,Xie Jing
The effect of gum tragacanth (GT) and sodium alginate (SA) active coatings incorporated with epigallocatechin gallate (EGCG, 0.16%, 0.32% and 0.64%, respectively) on the quality of large yellow croaker fillets was evaluated during superchilling storage at -3 ℃ for 42 days. The results revealed that the GT-SA-EGCG active coatings delayed the microbial spoilage via reducing the numbers of total viable counts, Pseudomonas spp. and psychrophiles bacteria, retarded degradation of the physical properties of water holding capacity, cooking loss, color, odor and texture. GT-SA-EGCG coatings could also maintain the fillets’ freshness by keeping lower total volatile basic nitrogen, K value and histidine content, inhibiting myofibrillar protein degradation during superchilling storage. These results suggested that the active coatings embedded with GT-SA-EGCG could be used as a preservative to enhance the quality of large yellow croaker and prolong the shelf life by 7-14 days during superchilling storage at -3 ℃.
研究领域:
食品科学
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食品保鲜
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水生生物学
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渔业
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）