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南京市食药检院金鑫团队:警惕新型高倍甜味剂的健康与生态风险 | 热心肠日报

  • 2026-05-09 16:25:02
南京市食药检院金鑫团队:警惕新型高倍甜味剂的健康与生态风险 | 热心肠日报
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本文要点

IF: 11.3
Newer high-intensity artificial sweeteners reduce bacterial susceptibility to ampicillin and induce intestinal inflammation in zebrafish
金鑫
Ling ZhangJun YangYu CaoZhen DaiXiaoming GeJing Chen
金鑫
Article|2026-04-19
10.1016/j.jhazmat.2026.142123

背景与设计

针对新型高倍甜味剂环境风险不明的问题,在食品法典委员会基准浓度下,利用大肠杆菌、枯草芽孢杆菌及斑马鱼模型评估了新甜味素(NTM)、阿力甜(ALT)和爱德万甜(ADM)的生物学效应。

总体概述

新型甜味剂诱导细菌产生伴随抗生素敏感性降低的应激适应性反应,且NTM特异性驱动斑马鱼肠道炎症,提示其潜在的生态与健康风险。

细菌表型

48小时暴露未抑制细菌生长,但导致两种细菌对氨苄西林的最低抑菌浓度升高最高达4倍,并呈剂量依赖性增加细胞内活性氧与细胞膜通透性。

分子机制

甜味剂暴露显著上调了多重耐药外排泵(acrA/tolC)、氧化应激(soxS)及细胞膜修复通路相关基因的表达。

物种毒性差异

在斑马鱼模型中,NTM的最大安全浓度(0.3 mg/L)远低于ALT与ADM(>2000 mg/L)。

肠道炎症终点

0.3 mg/L的NTM暴露导致斑马鱼肠道扩张、杯状细胞减少及中性粒细胞浸润,并显著升高TNF-α(79.7 pg/mL)等促炎细胞因子水平,表型类似TNBS诱导的肠炎。

核心关键词

人工甜味剂肠道炎症抗生素耐药性斑马鱼氧化应激食品安全生态毒理学

科普解读

在全球“减糖”浪潮的推动下,那些拥有极强甜度却几乎不提供热量的新型人工甜味剂,正以前所未有的速度渗透进食品供应链。然而,它们的化学稳定性使其在环境中如同“幽灵”般持久存在,不断汇入江河湖海。

如今,一项由南京市食品药品监督检验院的金鑫团队主导,发表于Journal of Hazardous Materials的研究揭示了一个令人不安的双重威胁:这些本应无害的化合物,不仅可能显著加剧肠道炎症,更可能充当细菌的“健身教练”,诱导它们对抗生素产生耐受性

细菌的“压力训练”

研究并非旨在模拟日常环境浓度,而是锚定于联合国粮农组织食品法典委员会(CAC/GSFA)规定的最大允许使用量,以探究最坏情况下的生物效应。团队将大肠杆菌和枯草芽孢杆菌分别暴露于纽甜(NTM)、阿力甜(ALT)和爱德万甜(ADM)这三种新型高强度甜味剂中。

直接结果显示,这些甜味剂并未直接杀死细菌。然而,当暴露持续48小时后,情况发生了微妙却关键的变化:细菌对抗生素氨苄青霉素的最低抑菌浓度显著攀升,最高甚至达到了原来的四倍。作为对照,暴露于普通葡萄糖的细菌则未出现这种敏感性下降。这暗示着,细菌对甜味剂的反应绝非简单的营养利用,而是一场主动的、非特异性的应激防御战

基因层面的“全面戒备”

为了解密这一防御机制,研究团队对细菌进行了转录组测序。数据显示,甜味剂处理组与对照组在基因表达谱上呈现出清晰的分离。进一步的基因分析揭示了细菌上演的“全武行”:首先是外排泵系统相关基因(如 acrA, tolC)的上调,这相当于细菌打开了强效的“外排泵”,将进入细胞的抗生素分子更卖力地泵出体外。

与此同时,胞内活性氧(ROS)水平的剂量依赖性升高,激活了核心调控基因 soxS(表达量激增超20倍)。这如同点燃了细菌内部的氧化应激警报,进而可能激活更广泛的防御网络。此外,与细胞膜通透性和修复相关的基因也出现广泛扰动,膜完整性受损伴随着补偿性的膜重塑反应。研究观察到的新型甜味剂诱导的适应性反应谱,与细菌在经典抗生素挑战下启动的应激模块有相当程度的重叠。

斑马鱼体内的“肠道风暴”

如果说细菌实验揭示了微观层面的耐药风险,那么在斑马鱼模型中的发现则直指更高等生物的健康威胁。在安全性评估中,三种甜味剂的命运截然不同。阿力甜和爱德万甜在浓度高达2000 mg/L时仍相对安全,而纽甜的最大安全浓度仅为0.3 mg/L,稍有逾越便会引发畸变甚至死亡。

在安全浓度下,研究团队对斑马鱼肠道作了精细评估。在仅0.3 mg/L的纽甜暴露下,幼鱼肠道出现了与化学诱导肠炎模型极为相似的病变:肠道管腔显著扩张、负责分泌保护性粘液的杯状细胞面积锐减,以及大量中性粒细胞向肠道组织浸润。

促炎因子检测印证了这一炎症风暴:纽甜组的TNF-α水平从对照组的44.0 pg/mL强力攀升至79.7 pg/mL, IL-1β更是从28.7 pg/mL增至75.0 pg/mL,其剧烈程度与阳性肠炎模型组相当。相较之下,阿力甜和爱德万甜在相同浓度下未引起显著异常。

不可忽视的环境交织风险

这项研究并未致力于寻求单一的因果定论,而是严谨地勾勒出一张潜在风险网。数据显示出的机制轮廓表明,细菌为应对化学应激启动的防御体系,恰巧编织出了对抗生素的“耐受外衣”。更深远地看,研究中观察到的膜适应性反应与特定基因下调,可能暗示环境中的这类亚致死压力,会为耐药基因在微生物群落间的水平转移创造更有利的条件。

论文的数据有力地论证了,以纽甜为代表的新兴强效甜味剂,其健康与环境风险亟需被重新审视。即便它们被准许直接添加到食品中,但其持续流入水体后的亚致死生物学扰动,可能会对微生态平衡形成不容忽视的“暗流”。研究团队展望,未来需在更低、更接近环境实际的浓度下,评估这些甜蜜“幽灵”在复杂基质和慢性暴露下的长期后果。

图片摘要

图片由AI生成,可能有错,请谨慎辨别。

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  1. CONNECT:[ UseTime:0.000445s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000717s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008400s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002611s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000517s ]
  6. SELECT * FROM `set` [ RunTime:0.001782s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000578s ]
  8. SELECT * FROM `article` WHERE `id` = 547944 LIMIT 1 [ RunTime:0.004191s ]
  9. UPDATE `article` SET `lasttime` = 1778802591 WHERE `id` = 547944 [ RunTime:0.018473s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003346s ]
  11. SELECT * FROM `article` WHERE `id` < 547944 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002877s ]
  12. SELECT * FROM `article` WHERE `id` > 547944 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.027199s ]
  13. SELECT * FROM `article` WHERE `id` < 547944 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009899s ]
  14. SELECT * FROM `article` WHERE `id` < 547944 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.029622s ]
  15. SELECT * FROM `article` WHERE `id` < 547944 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016195s ]
0.197771s