The effect of the glazing treatment and the incorporation of tea extracts upon frozen bonito flesh was investigated with respect to VBN, PV, TBARS, protein carbonyl, and both fluorescence and absorption spectrometry. VBN served as an indicator for the assessment of the freshness of the fish. The VBN of a frozen bonito fillet glazed with various tea extracts was determined over a period of 16 weeks with tissue stored at )20 C, as revealed by the data presented in Table 2. Generally speaking, the VBN values deriving from the tested flesh increased with increasing storage time. Table 2 summarizes the effects of the listed glazing treatments as regards reducing the formation of VBN from the fillet to a level less than that reflected by the untreated samples. The legal limit in Taiwan for VBN in foodstuffs is 25 mg/100 g material. The results show that the glazing treatment was very effective in maintaining a low VBN
value for the bonito fillet as compared to an untreated analogue. Tea extracts apart from black tea at concentrations equivalent to 5% of the glazing solution proved
to be more inhibiting of flesh denaturation than was the case for ice glazing. Moreover, green tea and Pouchong tea were more effective than black tea as regards
The effect of the glazing treatment and the incorporation of tea extracts upon frozen bonito flesh was investigated with respect to VBN, PV, TBARS, protein carbonyl, and both fluorescence and absorption spectrometry. VBN served as an indicator for the assessment of the freshness of the fish. The VBN of a frozen bonito fillet glazed with various tea extracts was determined over a period of 16 weeks with tissue stored at )20 C, as revealed by the data presented in Table 2. Generally speaking, the VBN values deriving from the tested flesh increased with increasing storage time. Table 2 summarizes the effects of the listed glazing treatments as regards reducing the formation of VBN from the fillet to a level less than that reflected by the untreated samples. The legal limit in Taiwan for VBN in foodstuffs is 25 mg/100 g material. The results show that the glazing treatment was very effective in maintaining a low VBNvalue for the bonito fillet as compared to an untreated analogue. Tea extracts apart from black tea at concentrations equivalent to 5% of the glazing solution provedto be more inhibiting of flesh denaturation than was the case for ice glazing. Moreover, green tea and Pouchong tea were more effective than black tea as regards
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