title: Biogenic unmodified gold nanoparticles for selective and quantitative detection of cerium using UV-vis spectroscopy and photon correlation spectroscopy (DLS).
abstract: The ability of self-functionalized biogenic GNPs towards highly selective colorimetric detection of rare earth element cerium is being reported for the first time. GNPs underwent rapid aggregation on addition of cerium indicated by red shift of SPR peak followed by complete precipitation. Hereby, this concept of co-ordination of cerium ions onto the GNP surface has been utilized for detection of cerium. The remarkable capacity of GNPs to sensitively detect Ce without proves beneficial compared to previous reports of colorimetric sensing. MDL was 15 and 35 ppm by DLS and UV-vis spectroscopy respectively, suggesting DLS to be highly sensitive and a practical alternative in ultrasensitive detection studies. The sensing system showed a good linear fit favouring feasible detection of cerium in range of 2-50 ppm. Similar studies further showed the superior selectivity of biogenic GNPs compared to chemically synthesized counterparts. The sensing system favours on-site analysis as it overcomes need of complex instrumentation, lengthy protocols and surface modification of GNP.
authors: Academy of Scientific and Innovative Research, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.
authors: E
authors: E
authors: Priyadarshini
authors: Academy of Scientific and Innovative Research, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India; Bioresources Engineering Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India. Electronic address: nilotapala_pradhan@yahoo.co.in.
authors: N
authors: N
authors: Pradhan
authors: Bioresources Engineering Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.
authors: P K
authors: PK
authors: Panda
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.
authors: B K
authors: BK
authors: Mishra
mesh_terms: D015374:Biosensing Techniques; D002563:Cerium / Q000302:isolation & purification*; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D017785:Photons; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002563:Cerium; D006046:Gold
keywords: Aspergillus candidus; Biogenic; Cerium; Colorimetric detection; Dynamic light scattering; Gold nanoparticles