title: Thermal and spectroscopic studies on sorption of nickel(II) ion on protonated baker's yeast.
abstract: Protonated form (Hy) of yeast was subjected to thermal analysis (TGA and DTG) in the temperature range 60-800 degrees C. Chemically bound water volatilizes around 200 degrees C and the matrix undergoes extensive oxidative decomposition at 450 degrees C, the weight loss reaching 75% at 800 degrees C. The sorption capacity of the matrix for nickel(II) ion increases on heat treatment from 60 to 200 degrees C (from 16.9 to 25.0 mg/g), but was reduced on heating to higher temperatures at an initial nickel(II) ion concentration of 1200 mg/g. The FTIR spectra of Hy and nickel(II) ion saturated yeast, indicated that biosorption occurs on the sugar and nucleic acid regions, possibly involving --COOH and --NH groups.
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, 110 016 Delhi, India.
authors.forename: V
authors.initials: V
authors.lastname: Padmavathy
authors.forename: Padma
authors.initials: P
authors.lastname: Vasudevan
authors.forename: S C
authors.initials: SC
authors.lastname: Dhingra
mesh_terms: D000042:Absorption; D002241:Carbohydrates / Q000737:chemistry; D006358:Hot Temperature; D009532:Nickel / Q000737:chemistry* / Q000378:metabolism; D009696:Nucleic Acids / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D011522:Protons; D012441:Saccharomyces cerevisiae / Q000737:chemistry* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D002241:Carbohydrates; D009696:Nucleic Acids; D011134:Polysaccharides; D011522:Protons; D029701:Saccharomyces cerevisiae Proteins; D009532:Nickel