亚硝酰氢对冷藏草莓保鲜效果的影响
2018-08-14高彬周慧张树芹朱树华
高彬 周慧 张树芹 朱树华
摘要:为探究亚硝酰氢(nitroxyl,HNO)对草莓果实冷藏保鲜效果的影响,以“甜查理”草莓作为试验材料,用不同浓度HNO供体1-亚硝基环己酸酯(1-nitroso cyclohexanoate,NCA)溶液浸泡处理草莓果实,在0℃条件下恒温贮藏,研究不同浓度HNO供体处理对“甜查理”草莓采后冷藏期间果实硬度、可溶性固形物、活性氧(reactive oxygen species,ROS)、丙二醛(malondialdehyde,MDA)、脯氨酸含量及抗氧化酶活性等的变化。结果表明,HNO供体处理有效地保持了采后草莓果实的硬度,减缓了果实中可溶性固形物含量的升高,抑制了ROS和MDA含量的升高,减缓了脯氨酸含量降低,使草莓果实在采后冷藏过程中能较长时间保持果实风味。HNO供体处理延缓草莓超氧化物歧化酶(superoxide dismutase,SOD)活性降低,抑制过氧化物酶(peroxidase,POD)、多酚氧化酶(polyphenol oxidase,PPO)活性,从而增强对超氧自由基的清除能力,减轻超氧自由基引起的伤害,延缓果实褐变腐败。综合来看,当HNO浓度为0.2 g/L時,草莓的冷藏保鲜效果最佳。
关键词:草莓;亚硝酰氢;冷藏;贮藏品质
中图分类号:S668.4:TS255.3文献标识号:A文章编号:1001-4942(2018)05-0129-07
Abstract To investigate the effect of nitroxyl (HNO) on preservation of strawberry fruits during cold storage, the strawberry fruits of Sweet Chalie cultivar were treated with different concentrations of HNO donor solution and stored at 0℃. The physiological indicators including fruit firmness, soluble solid content, reactive oxygen (ROS) activity, malonaldehyde (MDA) content, proline content and antioxidant enzyme activities were investigated in this paper. The results showed that HNO donor treatment effectively maintained the fruit firmness of postharvest strawberry fruits, delayed the decrease of soluble solid content, inhibited the contents of reactive oxygen species and malondialdehyde, and delayed the content decrease of proline, so the strawberry fruits could be preserved for longer time with better flavour under cold storage. The HNO treatment decreased the increase of SOD activity and inhibited the activities of POD and PPO of strawberry during storage, so as the ability of scavenging superoxide radicals was enhanced and the damage caused by superoxide radicals was reduced, which delayed the fruit browning and rot. In conclusion, treating strawberry fruits with 0.2 g/L HNO could obtain the optimum preservation effect under cold storage.
Keywords Strawberry fruits; HNO; Cold storage; Quality
草莓(Fragaria ananassa Duch)属蔷薇科草莓属多年生常绿草本植物,由于其色艳形美、柔软多汁、酸甜可口,有较高的营养价值,被誉为“水果皇后”,受到广大消费者青睐。但是,草莓含水量高,组织娇嫩,极易受机械损伤和真菌感染,腐败变质,限制了草莓的销售与加工。因此,研究适宜的草莓贮藏保鲜技术,使其保持较好的品质,降低草莓采后损失是草莓生产销售中的当务之急。
在草莓保鲜方面,国内外开展了大量研究。不同的保鲜剂对草莓具有不同的保鲜效果。……
