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第186章 菜市场(1 / 2)

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近日,一种将大蒜瓣铺在西瓜上的猎奇保鲜的方法在网络热传。有人质疑,有人尝新。果蔬保鲜一直受到市民们的关注,尤其是对于忙于工作无法每天逛菜场买新鲜菜的打工人来说,难免需要利用冰箱适当“囤菜”。可不同于肉类,被采收上来以后果蔬仍然是有生命的有机体,会继续进行一系列生理和生化变化,如何储藏才科学合理?联合推出“食话实说”第二季系列短视频。本期,我们来到品冷链物流技术重

大蒜给西瓜保鲜?

不如将西瓜分块存放在保鲜盒里

“全国妈妈都一样?搞不懂这是为啥?蒜味西瓜?”“西瓜上放几瓣大蒜就能杀菌保鲜?还是‘蒜’了吧!”夏季食物不好保存,买回一个大西瓜常常一次吃不完,2023年8月,记者在网络平台上注意到,竟有人想出在切开的西瓜上铺上大蒜瓣儿的“神操作”。这样的方法受到的质疑可不少,事实究竟怎样?

“大蒜中的大蒜素确实对细菌、真菌等有抑制作用”,但这得是在大蒜被挤压或切割破损之后才会在蒜氨酸酶的作用下生成大蒜素,且并不意味着“杀菌”就是可以杀掉西瓜上的致腐菌。“其次,大蒜本身也会腐烂。最重要一点就是大蒜特殊的气味通常大家忍受不了,没有必要。”

作为夏季常见的一种消暑水果,西瓜最大的特点就是含水量高、糖分高、风味独特,营养也相对比较丰富,这就意味着在夏天西瓜可是微生物滋生的一个绝佳培养基质。那么在保鲜专家看来,西瓜该如何保鲜?首先建议切开的西瓜第一时间包上保鲜膜。这里尤其需要提醒的是,除了对于切开的西瓜瓤一面覆膜外,专家建议也要对西瓜皮部分覆膜,尽可能避免瓜皮上没洗干净的微生物和污渍污染冰箱在有条件的情况下更提倡用保鲜盒进行分块包装。这样不仅解决了瓜皮外面可能携带微生物对冰箱其他地方的二次污染,同时也能节约冰箱的空间。

哪些蔬果对温度“敏感”?冰箱存放有讲究,保鲜得当可放一个月

不仅是西瓜,其实果蔬保鲜一直受到市民们的关注。蔬菜的种类繁多,我们能买到的品类也越来越丰富。具体如何保鲜受到种植方式、地域、采收季节等各种情况的影响,因此有所不同。

对于忙碌于工作无法每天逛菜场买菜的打工人来说,利用冰箱适当“囤菜”是个普遍的选择。如今,大部分家庭使用的冰箱都分为上中下三层,分别是冷藏室、保鲜层和冷冻室。通常情况下,冷藏室的温度可调节范围在4-7℃;保鲜层在0-2℃左右;冷冻室温度在-18℃以下。农产品对温度的适应性是保鲜农产品的重要依据,不合适的温度会加速农产品的损耗。

哪些蔬菜对温度特别敏感?专家介绍,含淀粉量比较高的蔬菜,例如大家熟悉的根茎类土豆、芋头、红薯因为含淀粉量比较高,如果长时间在低温区储藏,比如说在5~7℃的冷藏室久放就会产生冷害。

所谓冷害,是指一些冷敏性植物在组织冰点以上的低温环境下造成的损伤。常见的香蕉皮变黑、茄子“褐变”由嫩绿色到麻麻赖赖的黑褐色等都是明显的冷害。冷害会引起果蔬内部结构破坏、营养成分流失、抗病性和耐贮性下降等,进而导致果蔬变质腐烂。“我们有时候感觉土豆煮不熟、煮不透就是淀粉型的蔬菜对低温的一种冷害,是淀粉变性的结果。”

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