Abstract
Papaya peel is a good source of papain enzyme (cysteine protease) but currently unutilized for any commercial purpose and disposed of as waste, thereby becoming a source of pollution. Therefore, this study investigates the behavior of papain enzyme (cysteine protease) in an aqueous two-phase system (ATPS) comprising polymer/salt. Considering the excluded volume effect, polyethylene glycol (PEG) with a molecular weight of 6000 g/mol was used to form the ATPS. Sulphate salts (ammonium sulphate and sodium sulphate) were chosen to form phases owing to their ability to promote the hydrophobic difference between the phases. From the result, the best ATPS condition for the partitioning of cysteine protease was 10% (w/w) PEG 6000 + 18% (w/w) Na2SO4 at constant pH 9 and obtained the highest enzyme activity (Ke) 1.43 which increased the purity by 4.08-fold (PF) with the yield of 26.38%. PEG/salt ATPS has been shown to work well to purify partitioned cysteine protease, which can be scaled up and extracted with a high yield and purity factor. In addition, the paper studies the (Sodium dodecyl-sulfate polyacrylamide gel electrophoresis) SDS-PAGE patterns of cysteine protease partitioned from papaya peels. The ATPS system is therefore effective in recovering and purifying papain enzymes from papaya peel.
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Acknowledgements
The authors would like to acknowledge the fellowship received from All India Council of Technical Education (AICTE), New Delhi, India for carrying out the work. The authors would also like to acknowledge the help received from Prof. Robin Doley and Ms. Nyumpi Bagra for using the facilities of their lab and helping in analysis of the samples.
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Mohit Singla: Methodology, validation, Formal analysis, investigation, Writing-original draft; Nandan Sit: Conceptualization, validation, writing-review and editing, visualization, supervision, project administration.
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Singla, M., Sit, N. Isolation of papain from ripe papaya peel using aqueous two-phase extraction. Food Measure 17, 1685–1692 (2023). https://doi.org/10.1007/s11694-022-01741-3
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DOI: https://doi.org/10.1007/s11694-022-01741-3