title: Different shades of cholesterol: Gold nanoparticles supported on MoS2 nanoribbons for enhanced colorimetric sensing of free cholesterol.
abstract: In the present study, we manifest that traditionally used gold nanoparticles when supported on molybdenum disulfide nanoribbons matrix (MoS2 NRs-Au NPs) show synergistically enhanced intrinsic peroxidase like catalytic activity and can catalyze the oxidation of 3,3',5,5' tetramethyl benzidine by H2O2 to produce a highly sensitive blue shade product depending on level of free cholesterol, when tested on complex system of human serum. Further the system attests appreciable kinetics, owing to Km value as low as 0.015 mM and better loading capacity (Vmax=6.7×10(-6) M s(-1)). Additionally, the proposed system is stable for weeks with ability to perform appreciably in wide pH (3-6) and temperature range (25-60 °C). Utilizing this potential, the present work proposes a cholesterol detection color wheel which is used along with cost effective cholesterol detection strips fabricated out of proposed MoS2 NRs-Au NPs system for quick and reliable detection of free cholesterol using unaided eye.
authors.affiliation: Department of Zoology, Banaras Hindu University,Varanasi 221005, India.
authors.forename: Narsingh R
authors.initials: NR
authors.lastname: Nirala
authors.affiliation: Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.
authors.forename: Shobhit
authors.initials: S
authors.lastname: Pandey
authors.affiliation: Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.
authors.forename: Anushka
authors.initials: A
authors.lastname: Bansal
authors.affiliation: Department of Physics, Banaras Hindu University, Varanasi 221005 , India.
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Singh
authors.affiliation: Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.
authors.forename: Bratindranath
authors.initials: B
authors.lastname: Mukherjee
authors.affiliation: Department of Zoology, Banaras Hindu University,Varanasi 221005, India. Electronic address: pssaxena@rediffmail.com.
authors.forename: Preeti S
authors.initials: PS
authors.lastname: Saxena
authors.affiliation: Department of Physics, Banaras Hindu University, Varanasi 221005 , India. Electronic address: anchalbhu@gmail.com.
authors.forename: Anchal
authors.initials: A
authors.lastname: Srivastava
mesh_terms: D001560:Benzidines / Q000737:chemistry; D015374:Biosensing Techniques; D002384:Catalysis; D002784:Cholesterol / Q000097:blood*; D003124:Colorimetry; D004220:Disulfides / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure; D010084:Oxidation-Reduction
chemical_list: D001560:Benzidines; D004220:Disulfides; C021758:3,3',5,5'-tetramethylbenzidine; D006046:Gold; D008982:Molybdenum; D002784:Cholesterol; D006861:Hydrogen Peroxide; C082964:molybdenum disulfide
keywords: Cholesterol; Color wheel; Colorimetric; Gold nanoparticles; Molybdenum disulfide nanoribons; Peroxidase mimetic