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2849879 
Journal Article 
Extraction and purification of beta-amylase from stems of Abrus precatorius by three phase partitioning 
Sagu, ST; Nso, EJ; Homann, T; Kapseu, C; Rawel, HM 
2015 
Yes 
Food Chemistry
ISSN: 0308-8146
EISSN: 1873-7072 
183 
144-153 
English 
25863622 
The stems of Abrus precatorius were used to extract a beta-amylase enriched fraction. A three phase partitioning method and a Doehlert design with 3 variables (ratio of crude extract/t-butanol, the ammonium sulphate saturation and pH) were used. The data was fitted in a second-order polynomial model and the parameters were optimized to enrich beta-amylase. Experimental responses for the modulation were recovery of activity and the purification factor. The optimal conditions were: a ratio of crude extract/t-butanol of 0.87 (v/v), saturation in ammonium sulphate of 49.46% (w/v) and a pH of 5.2. An activity recovery of 156.2% and a purification factor of 10.17 were found. The enriched enzyme was identified as a beta-amylase and its molecular weight was 60.1kDa. Km and Vmax values were 79.37mg/ml and 5.13U/ml, respectively and the highest activity was registered at a temperature of 70°C and a pH between 6 and 6.5. A significant stabilization of the beta-amylase was observed up to 65°C. 
Abrus precatorius; Beta-amylase; Doehlert design; Purification; Three phase partitioning 
IRIS
• tert-Butanol
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