The study aimed to establish a comprehensive method to evaluate the effects of thymol microcapsules/konjac glucomannan/low acyl gellan gum (TKL) edible composite coating on postharvest quality of blueberry.The late-ripening variety Baldwin was used as the test material.Based on the sensory, physiological and biochemical, nutrient, color, and texture perspectives, representative indicators were selected to comprehensively evaluate the effect of TKL preharvest spraying on blueberry quality using principal component analysis (PCA), cluster analysis, and correlation analysis.Results showed that the TKL coating treatment slowed down the decrease in sensory, fruit shape index, titratable acid, hardness, L*, b*, H*, and springing during storage of blueberry, reduced the increases in weight loss ratio, decay rate, malondialdehyde, and C*, and increased the contents of soluble solid, chewiness, resilience, total phenols, total flavonoids, and anthocyanidin.The TKL coating effectively slowed down the deterioration of blueberry quality.PCA analysis obtained 2 principal components with a cumulative variance contribution of 86.90%.The fitting of PCA scores with sensory values was an extremely significant positive correlation (P<0.01).Cluster analysis indicated that the blueberry quality of TKL coating treatment at 21-56 days was in the same category as the control at 7-35 days.Correlation showed that PCA scores were extremely significant and positively correlated with sensory evaluation (P<0.01).Cluster analysis showed that the quality of blueberry by TKL coating at 21-56 days was the same as that of the CK group at 7-35 days.The TKL coating treatment extended the storage period of Baldwin blueberry from 42 days to 63 days.The combination of PCA and cluster analysis could more scientifically, systematically, and accurately evaluate the effect of TKL coating on the postharvest preservation of blueberries, providing a theoretical basis for the application of TKL coating on postharvest fruit preservation.
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