Citation
Crafts R.C., . and Davey J.E., . and McSweeney G.P., . and Stephens I.S., . Comparison of free fatty acid values with individually determined organic and inorganic acid concentrations in the extracts of Malaysian natural rubber. pp. 275-285. ISSN 0127-7065
Abstract
Free fatty acid (FFA) values are frequently taken to be a measure of the long-chain fatty acid content of rubber samples. However from an analytical view-point it is apparent that the acidity measured during this test could not be due entirely to acids containing more than ten carbon atoms. Ion chromatography and gas chromatography have been used to identify and quantify the acidic components of the acetone extract of natural rubber. The combined acid concentrations measured by these techniques account for more than 85 percent of the FFA value and of this figure low molecular weight organic and inorganic acids account for up to one half. It may be concluded that expressing the result of an FFA titration as 'stearic acid' can seriously over-estimate the quantity of long-chain fatty acids present in natural rubber and may mask important differences in the composition of both these and the low molecular weight materials.
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Abstract
Free fatty acid (FFA) values are frequently taken to be a measure of the long-chain fatty acid content of rubber samples. However from an analytical view-point it is apparent that the acidity measured during this test could not be due entirely to acids containing more than ten carbon atoms. Ion chromatography and gas chromatography have been used to identify and quantify the acidic components of the acetone extract of natural rubber. The combined acid concentrations measured by these techniques account for more than 85 percent of the FFA value and of this figure low molecular weight organic and inorganic acids account for up to one half. It may be concluded that expressing the result of an FFA titration as 'stearic acid' can seriously over-estimate the quantity of long-chain fatty acids present in natural rubber and may mask important differences in the composition of both these and the low molecular weight materials.
Additional Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | 3 ill.; 5 tables; 8 ref. Summary (En) |
| AGROVOC Term: | HEVEA |
| AGROVOC Term: | CAUCHO |
| AGROVOC Term: | ACIDOS GRASOS LIBRES |
| AGROVOC Term: | CROMATOGRAFIA DE GASES/ CROMATOGRAFIA DE CAMBIO IONICO |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:56 |
| URI: | http://webagris.upm.edu.my/id/eprint/20235 |
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