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| Bio-preservation of longan fruits by complex preservativewith Leuconostoc mesenteroides dgnkzx002 |
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| Abstract: |
| To investigate the preservation effects of lactic acid bacteria on Longan fruit（Dimocarpus longan
Lour. cv. Shixia，Dongfeng）and to develop a complex bio-preservative agent as an alternative to chemicals，this paper
optimized the ingredients of the complex bio-preservative agent by single factor experiments and L9（34）orthogonal
design. Results indicated that L. mesenteroides had extremely significant influence on SOD activity in fruit peel，while
1.5% sodium lactate had a significant impact and the effect of 0.1% chitosan + 2% citric acid was minimun. The complex
bio-preservative agent with 1.72×107 CFU/mL Leuconostoc mesenteroides dgnkzx002 +（0.1% chitosan + 2% citric
acid）+1.5% sodium lactate had the most stable preservative effects on longan fruits. Results showed that total soluble
solids（TSS）and vitamin C content of longan fruits treated with the complex bio-preservative agent decreased by
16%，21.22%，respectively，had significant differences with control. And the activity of PPO and POD in fruit peel were
40 and 565 U/min·g，lower than 122，1 920 U/min·g in control group. |
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