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Pineapple fruit is rich in water, not suitable for storage, and has a relatively short shelf life, which seriously restricts the sales of fresh pineapple fruit. Low temperature storage is one of the effective measures to delay the quality deterioration of pineapple fruits after harvesting. To investigate the changes in antioxidant activity and quality of pineapples fruits at different shelf periods after low temperature storage, principal component analysis (PCA) and correlation analysis methods were used to comprehensively evaluate twelve antioxidant activity and quality parameters of pineapple fruits storage at 10 ℃ and shelf life at 25 ℃. The results indicated that the trend of phenylalanine ammonia lyase (PAL) activity and total phenolics (TP) content of fruits changes during the shelf life after low-temperature storage was consistent, with a significant decrease in titratable acidity (TA) and vitamin C (AsA) content, but no significant change in hydrogen peroxide (H2O2) and total soluble solids (TSS) content. Correlation analysis showed that the shelf life AsA content was significantly positively correlation with TAOC. PCA showed that the content of H2O2, malondialdehyde (MDA), and the activities of superoxide dismutase (SOD) and polyphenol oxidase (PPO) exhibited the determined antioxidant activity of pineapple fruits, while TP and TA content acted as important parameters for evaluating pineapple fruits during shelf life. The comprehensive evaluation score of pineapple fruits storage at low temperature for fifteen days showed the highest, and the comprehensive evaluation score of pineapple fruits with one day shelf life showed relatively high. Therefore, storing pineapples at low temperatures for 15-20 days followed by a shelf life of 1 day can effectively maintain their antioxidant activity and quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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