这种粽子高温蒸煮会产生有害物质!专家提醒
As the Dragon Boat Festival approaches, many households are stocking up on zongzi, or sticky rice dumplings, to celebrate the holiday. But experts warn that consumers should look beyond the zongzi themselves and pay attention to the materials used to wrap and tie them.
近日,话题“这种粽子绳高温蒸煮会产生有害物质”登上热搜,引发网友热议。
市场上有不少品牌的散装粽子,会用尼龙绳或塑料绳捆绑,有的还贴上塑料标签。
据了解,化学纤维绳安全性较差,如尼龙绳、涤纶绳、丙纶绳等高分子化合物,经高温烹煮将产生甲醛、苯等有害物质。
A recent topic trending on social media raised concerns about nylon or plastic strings used to tie some zongzi. Experts warn that certain synthetic materials may not be suitable for prolonged exposure to high cooking temperatures and could potentially release substances not intended for food contact.
塑料包装绳是用化工原料制成的,大多由回收塑料制成,其主要成分有聚乙烯、聚苯乙烯和聚氯乙烯,这几种材质的绳子遇热后,会析出甲醛类和二甲苯类毒素。
另外,颜色艳丽丰富的塑料绳还添加化学色素,长时间烹煮会使其中的塑化剂、调色剂对粽子造成污染,食用过程中导致有害物质的累积,对人体产生一些不健康的影响,安全性相对最低。
Brightly colored plastic strings may pose additional food-safety concerns. During prolonged cooking, some dyes and additives can migrate onto the zongzi, potentially affecting food safety. Experts generally recommend choosing natural or food-grade tying materials instead.
浙江工商大学食品与生物工程学院教授顾振宇介绍,尼龙绳、塑料绳和塑料标签确实有危害风险,但并不需要恐慌。人体有一定的耐受度,除非是极其稀少的过敏体质人群,否则按照粽子所含有害化学物质数量来计算,一般人只有每天吃顿顿吃,连续吃上几千个粽子,才会中毒。
江苏省消保委也曾提醒消费者,化学纤维绳和塑料包装绳与粽子一起长时间高温蒸煮,会析出毒素,析出量相对较小,不用过于担心。但建议尽量不要购买绑化学纤维绳和塑料绳的粽子,家庭自制粽子或其他美食,也尽量不要使用此类材质的绳子,尽可能使用棉线、麻绳、棕树叶、稻草等天然纤维材料。
此外,不少家庭都会选择自己包粽子。在选购粽叶时有网友表示,买到了“返青粽叶”。
市面上最常见的一种粽叶,是箬(ruò)竹叶,叶面宽长,韧性极佳,基本3~5片箬竹叶就可以包一个粽子;另一种常见的粽叶是芦苇叶,宽度一般,长度却很长,比较厚实。
而“返青粽叶”是一些商家为保持粽叶鲜绿好看,在浸泡粽叶时,违规加入了工业硫酸铜,让已经失去原色的粽叶返青,使其表面光鲜、色泽亮绿。长期或大量摄入铜,可能会导致铜元素蓄积引起铜中毒。
Another food-safety concern involves so-called "rejuvenated reed leaves". According to reports, some vendors soak faded leaves in copper sulfate solutions to restore a vivid green appearance and make them look fresher. Experts warn that excessive exposure to copper residues over time may contribute to copper accumulation in the body.
rejuvenated /rɪ'dʒuvəneɪtɪd/ 使变年轻的,使恢复活力的
如何鉴别这些粽叶?
① 看颜色:天然的粽叶绿得自然,叶片泛黄;处理过的粽叶色泽青绿,叶片颜色很均匀;
② 闻味道:新鲜的粽叶有天然的粽香,“返青粽叶”会闻到一股刺激的气味;
③ 水煮粽叶:正常粽叶煮后水呈现淡黄色,“返青粽叶”煮后水变绿。
Consumers can look for several clues when selecting reed leaves. Natural leaves typically have an uneven green color with slight yellowing and give off a fresh plant aroma. Leaves that appear unusually bright and uniform in color, or that have a noticeable chemical odor, may warrant extra caution.
A simple home test is to boil a reed leaf on its own. Water from natural leaves is usually light yellow after boiling, whereas water from so-called "rejuvenated" leaves may turn green.
如何选购粽子?
❶ 选择正规品牌
优先选择证照齐全的商超、品牌专卖店或官方电商旗舰店,避免购买流动摊贩、无资质微商的“三无”产品。
❷ 注意粽子的情况
优质的粽子应使用新鲜、卫生的食材。如正常的粽叶应为黄绿、墨绿或暗褐色,警惕通体鲜亮翠绿的粽叶,可能经硫酸铜染色(“返青粽叶”),长期食用损害肝肾。
❸ 注意查看包装情况
购买粽子时,检查包装是否完整,真空袋是否平整,出现鼓袋、漏气、破损、积水浑浊一律不购,这预示内部变质。
同时,注意查看保质期和保存方式,如需冷藏或冷冻保存,以确保食品的新鲜度和安全性。
❹ 留存凭证
购买粽子后,记得保留购物小票、订单截图,遇质量问题可拨打12315维权。
跟着China Daily
精读英语新闻
“无痛”学英语,每天20分钟就够!
↓↓↓
推 荐 阅 读