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不同浓度咯菌腈处理对泰山红石榴冷藏品质的影响

Effects of Different Concentrations of Fludioxonil on Refrigerated Quality of Taishanhong Pomegranate

  • 摘要: 为比较不同浓度咯菌腈处理对石榴冷藏品质的影响,以泰山红石榴为试材,分别以浓度为200 mg/L(T1)、400 mg/L(T2)、600 mg/L(T3)的咯菌腈处理石榴果实,在(5±1)℃、相对湿度90%~95%条件下冷藏112 d,冷藏期间每28 d取样测定石榴果实品质相关指标。结果表明:不同浓度咯菌腈处理对泰山红石榴冷藏过程中总可溶性固形物、可滴定酸、抗坏血酸、总酚含量,以及果皮和籽粒的色彩指数均无显著影响;较高浓度的咯菌腈延迟了冷藏过程中果皮过氧化物酶活性高峰出现的时间;咯菌腈处理在一定程度上加速了泰山红石榴冷藏过程中多酚氧化酶的钝化;T2组石榴在冷藏至第28天时,总抗氧化活性水平显著高于T1、T3组和对照组;冷藏至112 d时,褐变指数以T3组石榴最低(0.16),T2组次之(0.25),二者显著低于T1组(0.30)和对照组(0.31)。综合试验结果可知:随着咯菌腈浓度的升高,泰山红石榴冷藏后期的褐变相应减少;咯菌腈处理对泰山红石榴冷藏过程中的主要生理指标无显著影响;以400~600 mg/L的咯菌腈浓度处理对减少泰山红石榴冷藏后期的褐变效果较好。

     

    Abstract: In order to compare the effects of fludioxonil treatment with different concentrations on the refrigerated quality of pomegranate fruits, Taishanhong pomegranate fruits were treated with 200 mg/L(T1), 400 mg/L(T2) and600 mg/L(T3) concentrations of fludioxonil, respectively, then stored at(5±1) ℃ and RH 90%~95% for 112 days.Fruits quality related index of pomegranate were determined every 28 days during cold storage. Results showed that different concentrations of fludioxonil treatment had no significant effect on contents of total soluble solids(TSS),titratable acids(TA), ascorbic acid(AsA) and total phenolic(TP), color index of the pericarp and seeds of Taishanhong pomegranate fruit during cold storage. Higher concentration of fludioxonil delayed the onset of POD activity peak in pericarp during cold storage. Fludioxonil treatment accelerated the passivation of PPO during the cold storage to some extent. The total antioxidant activity(T-AOC) level of pomegranates in T2 group was significantly higher than that in T1, T3 and the control group on the 28th day of storage. Browning index of pomegranates in T3 group was the lowest(0.16) on the 112th day of storage, followed by T2 group(0.25), both were significantly lower than those in T1group(0.30) and in control group(0.31). In conclusion, the browning of the pomegranate fruit decreased with the increase of the fludioxonil concentration. In the later period of refrigeration, and fludioxonil treatment had no significant effects on the main physiological indexes of the fruit during cold storage. The treatment with 400~600 mg/L fludioxonil had a better effect to reduce the browning in the late period of Taishanhong pomegranate.

     

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