Department of Food Processing Technology and Management

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Author: search.filters.author.Subramani, Ramesh

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    TWO DISTINCT FLUORESCENT QUANTUM CLUSTERS OF GOLD STARTING FROM METALLIC NANOPARTICLES BY PH-DEPENDENT LIGAND ETCHING
    (Springer Link, 2008) Madathumpady, Abubaker Habeeb Muhammed; Subramani, Ramesh; Sudarson, Sekhar Sinha; Samir Kumar, Pal; Thalappil, Pradeep
    Two fluorescent quantum clusters of gold, namely Au25 and Au8, have been synthesized from mercaptosuccinic acid-protected gold nanoparticles of 4–5 nm core diameter by etching with excess glutathione. While etching at pH ∼3 yielded Au25, that at pH 7–8 yielded Au8. This is the first report of the synthesis of two quantum clusters starting from a single precursor. This simple method makes it possible to synthesize well-defined clusters in gram quantities. Since these clusters are highly fluorescent and are highly biocompatible due to their low metallic content, they can be used for diagnostic applications.
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    GREEN SYNTHESIZED SILVER NANOPARTICLES: TOXICITY AGAINST POECILIA RETICULATA FISHES AND CERIODAPHNIA CORNUTA CRUSTACEANS
    (Springer Link, 2016-11-30) Ramachandran, Ishwarya; Baskaralingam, Vaseeharan; Sathappan, Shanthi; Subramani, Ramesh; Pitchaimani, Manogari,; Kannan, Dhanalakshmi; Sekar, Vijayakumar; Giovanni, Benelli
    Recently, the green synthesis of silver nanoparticles gained increasing attention due to interesting properties for optical, antimicrobial and pest control applications. However, their toxicity against micro-crustaceans and fishes has been scarcely explored, while most of the research efforts focused on mosquito control with the green-synthesized nanocomposites. In this study, we investigated the toxic effects of AgNO3, Cissus quadrangularis (Cq)-synthesized AgNPs and Cq extract in two different study models, the larvae of Poecilia reticulata fishes and adults of the micro-crustacean Ceriodaphnia cornuta. In both species, AgNO3 and Cq-AgNPs showed high mortality rates even if tested at very low doses. Molecular analysis revealed high DNA damages induced by Cq-AgNPs on both aquatic organisms. Furthermore, light microscopy studies evidenced lesions in the gills and vacuolization in the gills and in the abdomen of P. reticulata larvae. Overall, our research pointed out that the exposure of aquatic organisms to AgNO3 or green-fabricated AgNPs can damage fishes and crustaceans, posing noteworthy risks to the aquatic ecosystems.
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    TWO DISTINCT FLUORESCENT QUANTUM CLUSTERS OF GOLD STARTING FROM METALLIC NANOPARTICLES BY PH-DEPENDENT LIGAND ETCHING
    (Springer Link, 2010-04-08) Madathumpady Abubaker, Habeeb Muhammed; Subramani, Ramesh; Sudarson, Sekhar Sinha; Samir Kumar, Pal; Thalappil, Pradeep
    Two fluorescent quantum clusters of gold, namely Au25 and Au8, have been synthesized from mercaptosuccinic acid-protected gold nanoparticles of 4 5 nm core diameter by etching with excess glutathione. While etching at pH ~3 yielded Au25, that at pH 7 8 yielded Au8. This is the fi rst report of the synthesis of two quantum clusters starting from a single precursor. This simple method makes it possible to synthesize well-defined clusters in gram quantities. Since these clusters are highly fl uorescent and are highly biocompatible due to their low metallic content, they can be used for diagnostic applications.