Effects of Different Concentrations of Chitosan Treatment on Storability and Storage Quality of Passion Fruit Postharvest

doi:10.3969/j.issn.1000-2561.2020.08.022

Abstract

Abstract:

The effects of different concentrations of chitosan treatment on the storability and storage quality of harvested passion (Passiflora caerulea L.) fruit were investigated in this study. The harvested passion (Passiflora caerulea L. cv. Fujian passion No.1) fruit were immersed in different concentrations of Kadozan (chitosan) solution with dilutions of 1∶50, 1∶100, 1∶150, 1∶200, and 1∶250 (V_Kadozan∶V_{Kadozan + Water}) for 5 min, while the passion fruit dipped in distilled water for 5 min as the control. The treated-passion fruits were air-dried for 0.5 h after dipped, then the passion fruits were packaged in polyethylene film bags with a thickness of 0.015 mm (10 passion fruits per bag), and stored at 28℃ and 80% relative humidity for 15 days. During storage, three bags of passion fruits (30 passion fruits) from each group were sampled at 3-day interval and measured the indices of the storability and quality attributes of passion fruits. Compared with the control, Kadozan (chitosan) treatment could effectively reduce the respiration rate of the fruit, retard the increment of pericarp cell membrane permeability, decrease the weight loss percentage from fruit, but keep higher commercially acceptable fruit rate. Additionally, higher chromaticity values of L ^*, a ^* and b ^* of the fruit surface, higher amounts of pericarp anthocyanin, flavonoid, and total phenolics, higher contents of pulp total soluble solid, titratable acidity, total soluble sugars, sucrose, vitamin C, and carotenoid were found in the Kadozan (chitosan) treated-passion fruit. Therefore, chitosan treatment could enhance the storability and retain higher storage quality of the passion fruits during postharvest storage. Among different concentrations of Kadozan (chitosan), the dilution of 1:200 (V_Kadozan∶V_{Kadozan + Water}) revealed the best storability and quality attributes of the passion fruit, which could be a novel approach for increasing storability and extending the shelf-life of passion fruits during postharvest storage.

Key words: passion (Passiflora caerulea L.), fruit, chitosan, Kadozan, storability, quality attributes, postharvest physiology

CLC Number:

GUO Xin,LIN Yuzhao,ZENG Lingzhen,LIN Jingying,YU Xingxing,LIN Hetong. Effects of Different Concentrations of Chitosan Treatment on Storability and Storage Quality of Passion Fruit Postharvest[J]. Chinese Journal of Tropical Crops, 2020, 41(8): 1665-1673.

Figures/Tables 6

Fig. 1 Respiration rate of postharvest passion fruit treated with different concentrations of chitosan ** indicates extremely significant difference (P<0.01) between the 1∶200 (VKadozan∶VKadozan+water) Kadozan-treated passion fruit and the control at the same storage day.

Fig. 2 Membrane permeability of postharvest passion fruit peel cells treated with different concentrations of chitosan * and ** indicate significant difference (P<0.05 and P<0.01, respectively) between the 1∶200 (VKadozan∶VKadozan+water) Kadozan-treated passion fruit and the control group on the same storage day.

Fig. 3 Values of L* (A), a* (B) and b* (C) in pericarp of postharvest passion fruit treated with different concentrations of chitosan * and ** indicate significant difference (P<0.05 and P<0.01, respectively) between the 1∶200 (VKadozan∶VKadozan+water) Kadozan- treated passion fruit and the control group on the same storage day.

Fig. 4 The contents of anthocyanin (A), flavonoid (B) and total phenolics (C) in pericarp of postharvest passion fruit treated with different concentrations of chitosan * and ** indicate significant difference (P<0.05 and P<0.01, respectively) between the 1∶200 (VKadozan∶VKadozan+water) Kadozan-treated passion fruit and the control group on the same storage day.

Fig. 5 The main nutrient components contents in pulp of postharvest passion fruit treated with different concentrations of chitosan * and ** indicate significant difference (P<0.05, and P<0.01, respectively) between the 1∶200 (VKadozan∶VKadozan+water) Kadozan-treated passion fruit and the control group on the same storage day.

Fig. 6 The commercially acceptable fruit rate (A) and weight loss percentage (B) of postharvest passion fruit treated with different concentrations of chitosan * and ** indicate significant difference (P<0.05 and P<0.01, respectively) between the 1∶200 (VKadozan∶VKadozan+water) Kadozan-treated passion fruit and the control group on the same storage day

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