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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. 18, No. 2, 2014, pp. 223-228
Bioline Code: ja14031
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 18, No. 2, 2014, pp. 223-228

 en Biochemical Investigation on the activities of Acid and Alkaline Phosphatases in two varieties of Carica papaya check for this species in other resources L. (Pawpaw) during ripening
AGOREYO, B.O. & NWEKE, M.A.

Abstract

The activities of acid phosphatase and alkaline phosphatase were investigated in two varieties of ripening Carica papaya check for this species in other resources fruit; Oblong-shaped variety which is also known as ‘Agric pawpaw’ and Pear-shaped variety which is also known as ‘Local pawpaw’. Acid phosphatase activity decreased significantly (p < 0.01) throughout the ripening stages from 0.0186 ± 0.0006 to 0.0037 ± 0.0002µmol/min/g fresh weight in the Oblong-shaped variety: ‘Agric pawpaw’ and from 0.0134 ± 0.0008 to 0.0068 ± 0.0004µmol/min/g fresh weight in the Pear-shaped variety: ‘Local pawpaw’. Conversely, alkaline phosphatase activity was found to increase significantly (p < 0.01) throughout the ripening stages from 0.0044 ± 0.0006 to 0.0135 ± 0.0006µmol/min/g fresh weight in the Oblong-shaped variety: ‘Agric pawpaw’ and from 0.0074 ± 0.0012 to 0.033 ± 0.0023µmol/min/g fresh weight in the Pear-shaped variety: ‘Local pawpaw’. These results suggest that acid phosphatase is the main non-specific phosphatase that is responsible for the production and supply of inorganic phosphate in the unripe stage of Carica papaya fruits, while alkaline phosphatase is responsible for the production and supply of inorganic phosphate in the overripe stage. Acid phosphatase and alkaline phosphatase could be obtained from the unripe and overripe stages of Carica papaya fruits respectively for research purposes, for commercial exploitation and industrial gains.

Keywords
Ripening; Phosphatases; Carica papaya; Agric pawpaw; Local pawpaw

 
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