Dipartimento di Fisica, Università di Pavia, Via Bassi 6, 27100 Pavia, Italy.
Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100 Pavia, Italy.
Sensors (Basel). 2023 Nov 7;23(22):9015. doi: 10.3390/s23229015.
Handly and easy-to-use optical instrumentation is very important for food safety monitoring, as it provides the possibility to assess law and health compliances at every stage of the food chain. In particular, the Surface-enhanced Raman Scattering (SERS) method appears highly promising because the intrinsic drawback of Raman spectroscopy, i.e., the natural weakness of the effect and, in turn, of the signal, is overcome thanks to the peculiar interaction between laser light and plasmonic excitations at the SERS substrate. This fact paved the way for the widespread use of SERS sensing not only for food safety but also for biomedicine, pharmaceutical process analysis, forensic science, cultural heritage and more. However, the current technological maturity of the SERS technique does not find a counterpart in the recognition of SERS as a routine method in compliance protocols. This is mainly due to the very scattered landscape of SERS substrates designed and tailored specifically for the targeted analyte. In fact, a very large variety of SERS substrates were proposed for molecular sensing in different environments and matrices. This review presents the advantages and perspectives of SERS sensing in food safety. The focus of the survey is limited to specific analytes of interest for producers, consumers and stakeholders in Oltrepò Pavese, a definite regional area that is located within the district of Pavia in the northern part of Italy. Our attention has been addressed to (i) glyphosate in rice fields, (ii) histamine in a world-famous local product (wine), (iii) tetracycline, an antibiotic often detected in waste sludges that can be dangerous, for instance in maize crops and (iv) Sudan dyes-used as adulterants-in the production of saffron and other spices, which represent niche crops for Oltrepò. The review aims to highlight the SERS performance for each analyte, with a discussion of the different methods used to prepare SERS substrates and the different reported limits of detection.
便于使用的光学仪器对于食品安全监测非常重要,因为它提供了在食物链的每个阶段评估法律和健康合规性的可能性。特别是,表面增强拉曼散射(SERS)方法具有很大的应用前景,因为拉曼光谱的固有缺陷,即效应的自然强度较弱,进而信号较弱,这一缺陷通过 SERS 衬底上激光光与等离子体激发之间的特殊相互作用得到克服。这一事实为 SERS 传感的广泛应用铺平了道路,不仅用于食品安全,还用于生物医学、药物过程分析、法医学、文化遗产等领域。然而,SERS 技术的当前技术成熟度在合规协议中并未得到 SERS 作为常规方法的认可。这主要是由于针对目标分析物专门设计和定制的 SERS 衬底的景观非常分散。事实上,为了在不同的环境和基质中进行分子传感,提出了非常多种类的 SERS 衬底。本综述介绍了 SERS 传感在食品安全中的优势和前景。调查的重点仅限于 Oltrepò Pavese 地区生产者、消费者和利益相关者感兴趣的特定分析物,该地区位于意大利北部帕维亚区。我们关注的是 (i) 稻田中的草甘膦,(ii) 一种世界闻名的当地产品(葡萄酒)中的组氨酸,(iii) 四环素,一种经常在废泥中检测到的抗生素,可能对玉米作物等造成危险,以及 (iv) 苏丹染料——作为掺杂物——在藏红花和其他香料的生产中,这些都是 Oltrepò 的特色作物。本综述旨在突出 SERS 对每种分析物的性能,讨论了用于制备 SERS 衬底的不同方法以及不同报道的检测限。