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A Microneedle Technology for Sampling and Sensing Bacteria in the Food Supply Chain

机译：用于食品供应链中的采样和传感细菌的微针技术

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摘要

Food quality monitoring, particularly, the detection of bacterial pathogens and spoilage throughout the food supply chain, is critical to ensure global food safety and minimize food loss. Incorporating sensors into packaging is promising, but it is challenging to achieve the required sampling volume while using food-safe sensor materials. Here, by leveraging water-based processing of silk fibroin, a platform for the detection of pathogenic bacteria in food is realized using a porous silk microneedle array; the microneedle array samples fluid from the interior of the food by capillary action, presenting the fluid to polydiacetylene-based bioinks printed on the backside of the array. Through the colorimetric response of bioink patterns,Escherichia colicontamination in fish fillets is identified within 16 h of needle injection. This response is distinct from spoilage measured via the increase in sample pH. It is also shown that the microneedles can pierce commercial food packaging, and subsequently sample fluid and present it to the sensor, enabling the adaptation of the technology downstream in food supply chains such as in stores or at home. This study highlights that regenerated structural biopolymers can serve as safe materials for food contact and sensing with robust mechanical properties and tailored chemistry.
机译：食品质量监测，特别是在整个食品供应链中检测细菌病原体和腐败，对确保全球食品安全性并尽量减少食物损失至关重要。将传感器纳入包装是有前途的，但在使用食品安全传感器材料时达到所需的采样体积是具有挑战性的。这里，通过利用水性加工丝素蛋白，使用多孔丝微针阵列实现用于检测食物中的病原细菌的平台;微针阵列通过毛细管作用从食物的内部进行样品流体，将流体呈现给阵列背面印刷的基于多迪亚乙烯的生物丝。通过生物链图案的比色响应，在针注射的16小时内鉴定了鱼片中的大肠杆菌粉化。这种响应与通过样品pH的增加测量的腐败不同。还表明微针可以刺穿商业食品包装，随后将流体刺穿并将其呈现给传感器，使得能够在食品供应链中的下游改编在商店或家中。该研究突出显示再生结构生物聚合物可以用作食品接触和具有鲁棒机械性能和量身定制的化学的安全材料。

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