Biobleaching of industrial important dyes with peroxidase partially purified from garlic.
An acidic peroxidase was extracted from garlic (Allium sativum) and was partially purified threefold by ammonium sulphate precipitation, dialysis, and gel filtration chromatography using sephadex G-200. The specific activity of the enzyme increased from 4.89 U/mg after ammonium sulphate precipitation to 25.26 U/mg after gel filtration chromatography. The optimum temperature and pH of the enzyme were 50°C and 5.0, respectively. The Km and V max for H2O2 and o-dianisidine were 0.026 mM and 0.8 U/min, and 25 mM and 0.75 U/min, respectively. Peroxidase from garlic was effective in decolourizing Vat Yellow 2, Vat Orange 11, and Vat Black 27 better than Vat Green 9 dye. For all the parameters monitored, the decolourization was more effective at a pH range, temperature, H2O2 concentration, and enzyme concentration of 4.5-5.0, 50°C, 0.6 mM, and 0.20 U/mL, respectively. The observed properties of the enzyme together with its low cost of extraction (from local sources) show the potential of this enzyme for practical application in industrial wastewater treatment especially with hydrogen peroxide. These Vat dyes also exhibited potentials of acting as peroxidase inhibitors at alkaline pH range.
Department of Biochemistry, University of Nigeria, Nsukka, Nigeria.
Akudo Chigozirim
AC
Osuji
Department of Biochemistry, University of Nigeria, Nsukka, Nigeria.
Sabinus Oscar O
SO
Eze
Department of Plant Sciences and Biotechnology, University of Nigeria, Nsukka, Nigeria.
Emmanuel Emeka
EE
Osayi
Department of Biochemistry, University of Nigeria, Nsukka, Nigeria.
Ferdinand Chiemeka
FC
Chilaka
D002850:Chromatography, Gel / Q000379:methods; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D005737:Garlic / Q000201:enzymology*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007221:Industry / Q000191:economics / Q000379:methods*; D009195:Peroxidase / Q000737:chemistry / Q000302:isolation & purification*; D062065:Wastewater / Q000737:chemistry
D004396:Coloring Agents; D006861:Hydrogen Peroxide; D009195:Peroxidase; D062065:Wastewater