L-cysteine modified silver nanoparticles for selective and sensitive colorimetric detection of vitamin B1 in food and water samples

Beeta Rani Khalkho; Ramsingh Kurrey; Manas Kanti Deb; Kamlesh Shrivas; Santosh Singh Thakur; Shamsh Pervez; Vikas Kumar Jain

doi:10.1016/j.heliyon.2020.e03423

L-cysteine modified silver nanoparticles for selective and sensitive colorimetric detection of vitamin B1 in food and water samples

Heliyon. 2020 Feb 16;6(2):e03423. doi: 10.1016/j.heliyon.2020.e03423. eCollection 2020 Feb.

Authors

Beeta Rani Khalkho¹, Ramsingh Kurrey¹, Manas Kanti Deb¹, Kamlesh Shrivas¹, Santosh Singh Thakur², Shamsh Pervez¹, Vikas Kumar Jain³

Affiliations

¹ School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, 492010, Chhattisgarh, India.
² Department of Chemistry, Guru Ghasidas Vishwavidyalaya, Koni, Bilaspur, Chhattisgarh, 495009, India.
³ Department of Chemistry, Govt. Engineering Collage, Raipur, 492015, Chhattisgarh, India.

Abstract

The use of L-cysteine modified silver nanoparticles (Cys-capped AgNPs) as a colorimetric probe for determination of vitamin B1 (thiamine) is described in the present work. This method is based on the measurement of red shift of localized surface plasmon resonance (LSPR) band of Cys-capped AgNPs in the region of 200-800 nm. The color of Cys-capped AgNPs was changed from yellow to colorless by the addition of vitamin B1. The mechanism for detection of vitamin B1 is based on the electrostatic interaction between positively charged vitamin B1, which causes the red shift of LSPR band from 390 nm to 580 nm. The interaction between Cys-capped AgNPs and vitamin B1 was theoretically explored by density function theory (DFT) using LANL2DZ basis sets with help of Gaussian 09 (C.01) program. The morphology, size distribution and optical properties of Cys-capped AgNPs were characterized by transmission electron microscope (TEM), UV-Visible spectrophotometry, Fourier transform infrared spectroscopy (FTIR) and dynamic light scattering (DLS) techniques. The method is linear in the range of 25-500 μg mL^-1 with correlation coefficient (R²) 0.992 and limit of detection of 7.0 μg mL^-1. The advantages of using Cys-capped AgNPs as a chemical sensor in colorimetry assay are being simple, low cost and selective for detection of vitamin B1 from food (peas, grapes and tomato) and environmental (river, sewage and pond) water samples.

Keywords: Aggregation; Colorimetric probe; Cys-capped silver nanoparticles; Electrostatic interaction; Environmental science; Food and environmental water samples; Food science; Materials chemistry; Vitamin B1.