LF-NMR combined with electronic nose to analyze the quality changes of refrigerated rainbow trout treated with composite preservative

Authors

SHEN Qiuxia, Sichuan Technology and Business College, Dujiangyan, Sichuan 611830, China
ZHU Keyong, Sichuan Technology and Business College, Dujiangyan, Sichuan 611830, China
LI Mingyuan, Xihua University, Chengdu, Sichuan 610039, China
QIAN Yang, Sichuan Technology and Business College, Dujiangyan, Sichuan 611830, China
XU Tongtong, Sichuan Technology and Business College, Dujiangyan, Sichuan 611830, China
WU Lichuan, Sichuan Technology and Business College, Dujiangyan, Sichuan 611830, China
YUAN Yang, Sichuan Technology and Business College, Dujiangyan, Sichuan 611830, China

Abstract

In order to study the effect of composite preservatives (chitosan, tea polyphenols and lemon juice) on the quality of rainbow trout fillets during storage, The fresh-keeping effects were listed as follows: texture, pH, TBA, TVB-N and the total number of colonies. LF-NMR and electronic nose technology were used to explore the changes of moisture content and volatile components during the storage. The results showed that the composite preservative group could better maintain the texture characteristics of fillets compared with the control group, and at the same time, it also could delay the TBA value, TVB-N value and total viable counts change of fillets. The T₂₁ amplitude of the two groups decreased gradually during the storage with the low field nuclear magnetic resonance(LF-NMR) measuring. In the late storage period (12~14 d), the proportion of free water in the treated group was significantly lower than the control group (P<0.05). Comparing with the initial period, the proportion of free water of two groups increased. Both principal component analysis(PCA) and linear discriminant analysis(LDA) could better distinguish the quality of fish fillets during storage. Loading analysis(LA) showed that the components that caused the bad freshness of fish fillets were mainly nitrogen oxides, inorganic sulfides, aromatic components, ethanol and so on. The results of PCA indicated that the control group began to spoilage on the 6th day, while the treated group began to spoilage on the 10th day. In summary, the results of LF-NMR and electronic nose were consistent with the results of physical and chemical indicators.

Publication Date

12-28-2019

First Page

130

Last Page

136

DOI

10.13652/j.issn.1003-5788.2019.12.024

Recommended Citation

Qiuxia, SHEN; Keyong, ZHU; Mingyuan, LI; Yang, QIAN; Tongtong, XU; Lichuan, WU; and Yang, YUAN (2019) "LF-NMR combined with electronic nose to analyze the quality changes of refrigerated rainbow trout treated with composite preservative," Food and Machinery: Vol. 35: Iss. 12, Article 24.
DOI: 10.13652/j.issn.1003-5788.2019.12.024
Available at: https://www.ifoodmm.cn/journal/vol35/iss12/24

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