Abstract
ABSTRACTGolden pompano (Trachinotus ovatus) quality forecasting method utilising Vis/NIR spectroscopy combined with electronic nose (EN) was investigated in this article. Responses of Vis/NIR spectroscopy and EN to pompanos stored at 4°C were measured for 6 days. Physical/chemical indexes including texture, total volatile basic nitrogen, pH, total viable counts, and human sensory evaluation were synchronously examined as quality references. Chemometric methods including principal component analysis (PCA) and stochastic resonance (SR) were employed for spectroscopic and EN data analysis. Physicochemical examination demonstrated that fish quality decreased rapidly during storage. PCA qualitatively classified freshness degree of pompano samples, while SR signal-to-noise ratio (SNR) spectrum using SNR maximum quantitatively characterised quality for all samples. Golden pompano quality predictive models were developed based on spectroscopy, EN, and spectroscopy combined with EN, respectively. Results demonstrated that the model developed based on spectroscopy combined with EN presented a forecasting accuracy of 93.3%.
Highlights
Golden pompano (Trachinotus ovatus) is an economically important marine fish species and favoured by most consumers, due to its good taste and rich nutrients.[1,2,3] pompanos have limited shelf life, and deteriorate after post-mortem due to biochemical reactions and microbial pollution.[1]
Golden pompano quality prediction by utilising Vis/NIR spectroscopy combined with electronic nose (EN) was explored
Pompano quality predictive models were developed based on Vis/NIR spectroscopy, EN, and Vis/NIR spectroscopy combined with EN, respectively
Summary
Golden pompano (Trachinotus ovatus) is an economically important marine fish species and favoured by most consumers, due to its good taste and rich nutrients (e.g. proteins, fats, unsaturated amino acids, and minerals).[1,2,3] pompanos have limited shelf life, and deteriorate after post-mortem due to biochemical reactions and microbial pollution.[1]. There are many protocols available for marine fish quality analysis, such as total viable counts (TVC)[4] and total volatile basic nitrogen (TVB-N).[5] But these protocols often rely on microbiological/chemical examination, which is rather time-consuming. To address this issue, many instrumental analysing methods such as gas chromatography, gas chromatography coupled with mass spectrometry, and HPLC have been applied for fish quality analysis.[6,7,8] the use of instrumental analysis realises computerised control and saves time, only well-trained operators can perform these experiments. The high cost for these instruments limits their wide application
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