摘要
在桑果汁中添加250 mg/L DMDC,检测其在4℃贮藏期间污染菌和营养品质的变化。结果表明,新鲜桑果汁中添加250 mg/L DMDC后,果汁中的菌落总数、乳酸菌数、酵母菌数以及霉菌数均呈线性快速下降,在添加DMDC 12 h后,各种菌群的数量不再显著减少(p>0.05)。添加250 mg/L DMDC的桑果汁在4℃下贮藏时间能延长至30 d左右,并且在30 d贮藏期内,桑果汁的色差、pH、总滴定酸和可溶性固形物含量没有发生显著变化,而桑果汁中的2种花色苷含量(芸香苷和矢车菊素)、总酚含量、DPPH自由基清除力和α-葡萄糖苷酶抑制率则出现明显波动。
Dimethyl Dicarbonate （DMDC）,as an antibacterial （ISN 242）,was approved to use in the fruit juice by the food additives standards of China.In this paper,changes in the microorganisms and quality attributes of mulberry juice during storage at 4 ℃ was investigated as added with 250 mg/L of DMDC.Results found that the counts of total bacteria,lactic acid bacteria,molds and yeasts significantly declined as DMDC was added to mulberry juice,and no further reductions of microbial counts were observed after 12 h of adding DMDC.And the counts of total bacteria,lactic acid bacteria,molds and yeasts significantly declined as DMDC was added to mulberry juice,and no further reductions of microbial counts were observed after 12 h.The storage times of mulberry juice added with 250 mg/L of DMDC can extend to about 30 d during storage at 4 ℃.Moreover,all the value of color,pH,titration acid,and total soluble solid showed no significant changes during 30 d storage at 4 ℃ as added with 250 mg/L of DMDC,and the content of anthocyanidin and total phenols,DPPH radical scavenging activity and α-glucosidase inhibitory activity showed a significant fluctuation.
出处
《热带作物学报》
CSCD
北大核心
2014年第7期1439-1443,共5页
Chinese Journal of Tropical Crops
基金
公益性行业(农业)科技专项课题(No.201303073-05)
广东省农业科学院院长基金(No.201216)
广东省科技计划项目(No.2012A020100005)
