Abstract
A method to extract proteins from natural rubber (NR) samples has been developed to characterize the protein composition of NR by SDS-PAGE electrophoresis. While the incubation of NR pieces in aqueous buffers did not provide satisfactory results (no protein bands detected by SDS-PAGE), the solubilization of NR pieces in an organic solvent, prior to centrifugation and protein extraction from the obtained pellet, was found efficient to highlight protein bands by SDS-PAGE. Pure cyclohexane was used to solubilize NR pieces and resulted in a low share of nitrogen in the pellet (29%). The addition of 10% (v/v) ethanol to cyclohexane allowed to significantly increase this share to 73% and to detect 13 protein bands by SDS-PAGE. The molecular weights of the four most intense bands suggest the presence in NR of the following proteins: rubber elongation factor, small rubber particle protein, hevamine, and β-1-3 glucanase.
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Abbreviations
- ADS:
-
Air-dried sheet
- CV:
-
Constant viscosity
- FT-IR:
-
Fourier transform infrared
- NR:
-
Natural rubber
- PBS:
-
Phosphate-buffered saline
- SDS-PAGE:
-
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- SMR:
-
Standard Malaysian rubber
- STR:
-
Standard Thai rubber
- TEM:
-
Transmission electron microscope
- THF:
-
Tetrahydrofuran
- TSR:
-
Technically specified rubber
- USS:
-
Unsmoked sheet
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Acknowledgements
This research is supported in part by the Graduate Program Scholarship from the Graduate School, Kasetsart University. Agropolis Foundation is thanked for the support to the creation of LipPolGreen-Asia platform in Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Bangkok. The authors thank Union Rubber Co. Ltd for providing latex in their plantation. This work was undertaken under the umbrella of Hevea Research Platform in Partnership (HRPP).
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Srisomboon, S., Wadeesirisak, K., Vaysse, L. et al. Optimization of a protein extraction method from natural rubber sheets made of Hevea brasiliensis latex. J Rubber Res 24, 27–39 (2021). https://doi.org/10.1007/s42464-020-00069-1
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DOI: https://doi.org/10.1007/s42464-020-00069-1