Mildewproof and preservation of organically-grown red globe table grapes under the atmosphere of high CO_2
For more than 100 years,SO 2 and its preparation is used for commercial mildewproof and preservation of grapes at home and abroad,however,it is not permitted for organic food.The effect on preventing mildew and preservation of organically-grown red globe table grapes at the atmosphere of 2%O 2 +1%,5%,20%,50% CO2 was evaluated during storage at 0 ℃.Control group was stored in air without CO2,and fruit quality attributes including respiration strength,polyphenol oxidase(PPO),malonaldehyde(MDA),relative conductivity and browning index were measured at regular intervals.Results indicated that the effects of preservation of the treatments of 1%,5%,20%,50% CO2 was superior than control group,but damages occurred on the treatment of 50% CO2.The treatment of CO2 during 0 ℃ has the best effect among the five groups,and the respiration strength,PPO,browning index was 638.24 mg CO2 /(kg·h),3.81 U,0.24,respectively.The fresh rate was 97.2%,while the control group was only 52.1%,and this can be an effective approach to prevent mildew and keep freshness`of organiallygrown red globe table grapes.