Silver nano-colloid particles embedded on Langmuir-Blodgett film matrix of stearic acid serving as a SERS active sensor for detecting the herbicide ‘Paraquat’

IF 4.3 2区 化学 Q1 SPECTROSCOPY
Anabadya Pal , Priyabrata Maity , Md Azaharuddin , Soumajit Chakrabarty , Susmita Nandi , Abhijit Das , Sourav Ghosh , Upasana Sett , Pathikrit Bandopadhyay , Sanchita Nandy , Joydeep Chowdhury , Tarakdas Basu
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Abstract

The herbicide Paraquat, widely used for efficient weed control, poses significant health risks to humans viz., severe toxicity to vital organs and induction of neurodegenerative disorder like Parkinson’s disease, underscoring the urgent need for developing sensitive detection methods for the herbicide. This study aims at fabricating a novel SERS-active substrate SA-LB/Ag (silver nano-colloids adsorbed on Langmuir-Blodgett film of stearic acid), as a SERS based sensor having high sensitivity, uniformity, and reproducibility to detect ultra-trace amounts of paraquat. The sensor was built up by immersing bilayer LB films of SA in silver nano-colloid suspension, prepared by mixing silver nitrate and sodium borohydride with vigorous stirring. Quantitative evaluations establish a significant linear regression across the concentration spectrum (100 ppm to 75 ppb) of paraquat, with a remarkable 15 ppb limit of detection (LOD) value. In practical terms, this SERS based sensor exhibits notable proficiency in detecting paraquat residues in (a) agricultural water from rice and vegetable fields and environmental water from adjoining water-logged areas, and (b) soil extracts of the agricultural fields. Moreover, the minimum toxic concentration of paraquat at the developmental stage of zebrafish embryos and larvae is found to be approximately 20 ppb, implying that the SA-LB/Ag sensor is sensitive enough to determine the limiting toxic level of paraquat for animal systems. Thus, the designed sensor holds far-reaching implications in ensuring food safety, monitoring the environment, and framing regulatory measures for paraquat use.

Abstract Image

嵌入硬脂酸Langmuir-Blodgett膜基质的银纳米胶体粒子作为检测除草剂百草枯的SERS主动传感器
除草剂百草枯(Paraquat)被广泛用于有效的杂草控制,对人类健康构成重大风险,即对重要器官产生严重毒性,并诱发帕金森病等神经退行性疾病,因此迫切需要开发对该除草剂敏感的检测方法。本研究旨在制备一种新型的SERS活性底物SA-LB/Ag(吸附在硬脂酸Langmuir-Blodgett膜上的银纳米胶体),作为一种基于SERS的传感器,具有高灵敏度、均匀性和重复性,用于检测超痕量百草枯。将SA双层LB膜浸泡在硝酸银和硼氢化钠搅拌制备的银纳米胶体悬浮液中,构建传感器。定量评估在百草枯的浓度谱(100 ppm至75 ppb)上建立了显著的线性回归,检测限(LOD)值显著为15 ppb。在实际应用中,这种基于SERS的传感器在检测(a)稻田和菜地的农业用水以及邻近水涝地区的环境用水以及(b)农田土壤提取物中的百草枯残留方面表现出显著的熟练程度。此外,发现斑马鱼胚胎和幼虫发育阶段百草枯的最低毒性浓度约为20 ppb,这意味着SA-LB/Ag传感器足够敏感,可以确定百草枯对动物系统的极限毒性水平。因此,所设计的传感器在确保食品安全、监测环境和制定百草枯使用的监管措施方面具有深远的意义。
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来源期刊
CiteScore
8.40
自引率
11.40%
发文量
1364
审稿时长
40 days
期刊介绍: Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.
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