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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 11, No. 2, 2007, pp. 99-103
Bioline Code: ja07033
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 11, No. 2, 2007, pp. 99-103

 en Determination Of In Vitro And In Vivo Production Of Polygalacturonase (pg) By Storage mold Aspergillus Niger check for this species in other resources V. Tieghem, During Storage Of Rice ( Oryzae Sativa check for this species in other resources L) Seeds
Ibiam, O.F.A & Arinze, A.E.

Abstract

The in vitro and in vivo production of pectic enzyme polygalacturonase (PG) by storage mold of rice Aspergillus niger and the effect of temperature and pH on the activity of the mold were investigated. The result of the assay for the production of polygalacturonase (PG) by the mold in vitro and in vivo showed that the activity of the enzyme when tested viscometrically, using 10% pectin was 142.9 R.V.U (Relative viscometric units) at 25°C. The optimum activity of the enzyme secreted in vitro by Aspergillus niger was obtained at a temperature of 25 °C, and at temperature of 25 °C and 30 °C for that secreted in vivo., with a value of 142.9 R. V.U. The least activity of the enzyme was obtained at 20 °C, 40 °C, 45 °C and 50 °C in vitro, and at 20 °C ,45 °C and 50 °C with a value of 111.1 R.V.U each. The optimum activity of the enzyme produced in vitro by the fungus obtained at pH 5 and 6 with a value of 125R.V.U, and at pH 5 with a value of 142.9 R .V. U. in vivo. The activity of the enzyme was least at pH 2, 3, 4, 7,8, 9 and 10 in vitro, and at pH 2,3,8,9 and 10. in vivo with a value of 111.1 R. V. U.

 
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