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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 11 to 11 of 11 (0.076 seconds)Spelling suggestions: "subject:"pectinesterase"" "subject:"pectinesterases""
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Pectinesterase do mamão (Carica papaya L.) / Pectinesterase from papaya (Carica papaya L.)Adelaide Tie Catutani 23 December 1982 (has links)
Não consta resumo na publicação. / Pectinesterase (E C 3.1.1.11) was extracted from papaya (Carica papaya L.) tissue and purified 4,48 fold by fractionated ammonium sulphate precipitation, dialysis and chromatography on DEAE-celulose and Sephadex G-100. Extraction conditions of enzyme were studied and their properties characterized. The increase on the activity of pectinesterase was practically followed by increase on the content of soluble pectin, during ripening. The molecular weight of the enzyme eluted in one peak of activity was 53.000 daltons. The pectinesterase has its maximum activity at pH 8,0 and at 0,2 M of NaCl. Optimum temperature for the enzyme assay was 60°C. The enzymatic reaction was linear with the time and protein concentration. With citric pectin as substrate, pectinesterase had a Km of 0,012% and was inhibited competitively by polygalacturonic acid with a Ki of 0,007%. Papaya pectinesterase was inhibited by sucrose, glucose and glicerol.
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