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A Comparative Study on Properties and Proteolytic Components of Papaya Peel and Latex Proteases


Paper Type 
Contributed Paper
Title 
A Comparative Study on Properties and Proteolytic Components of Papaya Peel and Latex Proteases
Author 
Phanuphong Chaiwut, Sarote Nitsawang, Lalida Shank, and Pawinee Kanasawud
Email 
lalida_shank@yahoo.com
Abstract:
Proteases from papaya peels were extracted with water followed by precipitation with ethanol and 57.6% yield was obtained. Their maximum hydrolysis of casein comparing to proteases from latex were similar in temperature but different in pH. Both of papaya proteases were fully activated by 5 mM cysteine, the peel enzymes were activated 1.6 times higher than latex enzymes. The peel proteases are also more stable in pH ≥ 8 and at 80oC than the latex proteases. Cathodic polyacrylamide gel electrophoresis and in situ proteolysis verified that papaya peel proteases are composed of papain as a major component, chymopapain, and possible two proteases which are absent in crude papain. Separation by anodic polyacrylamide gel electrophoresis and in situ proteolysis illustrated that proteases from papaya peels contained a protease with pI less than 8.3. Anion-exchange chromatography indicated that papaya peel proteases consisted of a number of proteins and proteases different from those found in papaya proteases.
Start & End Page 
109 - 118
Received Date 
2006-07-24
Revised Date 
Accepted Date 
2006-11-23
Full Text 
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Keyword 
papaya latex, papaya peel, proteases, properties, proteolytic component
Volume 
Vol.34 No.1 (JANUARY 2007)
DOI 
Citation 
Chaiwut P., Nitsawang S., Shank L., and Kanasawud P., A Comparative Study on Properties and Proteolytic Components of Papaya Peel and Latex Proteases, Chiang Mai Journal of Science, 2007; 34(1): 109-118.
View:1,263 Download:350

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