Analysis of the relationship between fluoride form transformation and quality change in Antarctic krill (Euphausia superba)

The relationship between fluoride form transformation and quality change in Antarctic krill was studied through analyzing total volatile base nitrogen( TVB- N),thiobarbituric acid- reactive substance( TBARS) as the quality indicators while Antarctic krill was stored at-20,-40,-80,4,20 ℃. The result demonstrated TVB- N value went up from 9.85 mg /100 g to 31.96 mg /100 g and 30.19 mg /100 g,respectively,when the fresh unfrozen Antarctic krill were stored at 20 ℃ for 10 hours and 4 ℃ for 28 hours,exceeding the limit standard in shrimp of 30 mg /100 g,the TVB- N value were all less than 30 mg /100 g in frozen storage(-20,-40,-80 ℃) for six months.TBARS value both exceeded 1 mg MDA stored at 20 ℃ for 8 hours and 4 ℃ for 20 hours,then reduced along with further oxidation,TBARS value showed no downtrend in frozen storage(- 20,- 40,- 80 ℃) for six months. Total fluoride content showed no significant difference in all the storage conditions frozen storage(- 20,- 40,- 80 ℃) of six months,4 ℃ of 28 hours,20 ℃ of 12 hours. Free fluoride content was always increasing and showed significant difference( p < 0.05).The result demonstrated free fluoride content had obvious positive correlation with TVB- N and TBARS,quality change of Antarctic krill had a greater impact on fluoride form transformation.