四种特色品种小苹果采后生理及耐贮性比较

    Comparison of postharvest physiology and storage tolerance of four characteristic small apples

    • 摘要: 探究四个特色小苹果品种采后生理品质及质地变化规律,为制定特色小苹果最佳贮藏货架期提供科学依据和理论参考。该研究以'龙丰''金红''塞外红''乙女'4个特色小苹果为试验材料,在常温(20±1) ℃条件下放置14 d,测定果实品质指标(硬度、可溶性固形物、可滴定酸、维生素C、乙醇和乙醛含量、乙烯释放量)以及穿刺参数(果肉硬度、果肉做功、破裂力、屈服力)和质地多面分析(Texture Profile Analysis)参数(脆裂性、内聚性、弹性、胶黏性、咀嚼性)等指标的动态变化,并对以上指标进行综合评分。结果表明不同品种小苹果果实的硬度、可滴定酸、维生素C含量随贮藏时间不断下降,可溶性固形物含量变化较小,其中'龙丰'果实硬度、维生素C含量和可滴定酸含量下降均较低,常温贮藏性能优良;'塞外红'刚采收时品质高,但在常温贮藏期间,硬度下降最大,品质下降较快,常温贮藏性能较差。'金红'和'乙女'硬度、维生素C含量下降也较大,且'金红'和'乙女'果实的乙醇、乙醛含量出现峰值,而其他小苹果的乙醇、乙醛含量均大体呈缓慢上升的趋势。不同品种小苹果果实的乙烯释放量呈现先增加后下降的趋势,均出现一个呼吸高峰,'龙丰''乙女''金红'和'塞外红'果实的呼吸高峰出现时间分别是12、6、10和8 d。小苹果果实的穿刺参数和TPA参数均呈现下降趋势,其中'塞外红'果实的穿刺参数和TPA参数在贮藏期间下降速度最快,其次是'金红'和'乙女'果实也呈现较大幅度的下降,而'龙丰'果实则下降最为缓慢。综合评分可知不同品种小苹果常温贮藏性能由高到低依次为'龙丰''金红''乙女''塞外红'。根据常温贮藏期间果实硬度等生理品质并结合果实口感变化,'塞外红''金红'品种的自然贮藏的最佳货架期应为8 d,'龙丰'为12 d,'乙女'为3 d,在以上最佳货架期间,4个品种特色小苹果果实口感保持良好且营养价值损失最低。研究结果为特色小苹果最佳贮藏货架期提供参考。

       

      Abstract: Abstract: Taste and textural attributes of foods have been changed as a result of the storage after harvest in the fruit production. This study aims to explore the physiological quality and texture of the four varieties of characteristic small apples after harvest, particularly for a better shelf life. Four varieties of small apples ('Longfeng', 'Jinhong', 'Saiwaihong', and 'Yinv') were used as the experimental materials. Some indicators were measured at room temperature (20±1℃) to comprehensively scored, including the fruit hardness, soluble solids, titratable acid, vitamin C, ethanol and acetaldehyde contents, ethylene, puncture parameters (pulp hardness, pulp work, rupture force, and yield force), and TPA parameters (brittleness, cohesion, elasticity, stickiness, and chewiness). The results showed that the hardness, titratable acid, and vitamin C content of various small apple fruits decreased continuously, where there was only a small change in the soluble solid content. Among them, the 'Longfeng' fruit presented excellent storage performance, indicating relatively decreased hardness, titratable acid, and vitamin C content. By contrast, the 'Saiwaihong' fruits behaved with the lowest storage performance, where the hardness decreased the most, and the quality decreased rapidly during normal temperature storage after harvest. There was also a great decrease in the hardness and vitamin C content of 'Jinhong' and 'Yinv' fruits. Furthermore, there was a peak in the ethanol and acetaldehyde contents of 'Jinhong' and 'Yinv' fruits, but a slow upward trend was generally observed in the rest small apples. The ethylene release of different varieties of small apple fruits increased first and then decreased, indicating a respiratory peak. The respiratory peaks of 'Longfeng', 'Yinv', 'Jinhong', and 'Saiwaihong' fruits were 12, 6, 10, and 8 days, respectively. The puncture and TPA parameters of small apple fruit showed a downward trend. Among them, the 'Saiwaihong' fruit decreased the fastest during storage, followed by 'Jinhong' and 'Yinv' fruit, and the 'Longfeng' fruit was the slowest. Correspondingly, the storage performances of different varieties of small apples were ranked from high to low as the 'Longfeng', 'Jinhong', 'Yinv', and 'Saiwaihong', according to the comprehensive score. Therefore, the fruit qualities after harvest were also ranked in the descending order of the 'Jinhong', 'Saiwaihong', 'Yinv', and 'Longfeng', in terms of the comprehensive score of various indexes. Nevertheless, the qualities of small apples after 14 days of normal temperature storage were ranked in the descending order of the 'Longfeng', 'Jinhong', 'Yinv', and 'Saiwaihong'. Consequently, the quality of 'Longfeng' fruit decreased the slowest during storage, while the quality of 'Saiwaihong' fruit decreased the fastest. As such, it was recommended that the best shelf life of 'Saiwaihong' and 'Jinhong' was 8 days, while that of 'Longfeng' was 12 days, and that of 'Yinv' was 3 days, according to the physiological qualities (such as fruit hardness) and fruit taste during normal temperature storage. An excellent taste and the lowest loss of nutritional value were achieved in the four varieties of characteristic small apples during the best shelf life. The finding can also provide a theoretical reference to formulate the best storage shelf life of characteristic small apples.

       

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