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https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/epdf/10.1002/jssc.202200061

Simultaneous quantification of volatile fatty acids and nonvolatile organic acids in Hevea brasiliensis latex

Dewi Kusuma Arti,Wilairat Cheewasedtham,Thitima Rujiralai

First published: 19 July 2022

https://doi.org/10.1002/jssc.202200061

The current method used in latex industries to determine the volatile fatty acids contents of Hevea brasiliensis latex is steam distillation. However, the accuracy of the method has been debated for some time. We assessed the accuracy of the method and developed a new, more reliable high-performance liquid chromatographic method of determining acids in latex. The volatile fatty acids (formic, acetic, propionic, butyric, and valeric acids) and nonvolatile organic acids (oxalic, malic, lactic, citric, and succinic acids) in latex are directly determined simultaneously for the first time with high sensitivity and without losses during sample preparation. To avoid errors from derivatization, an acid-resistant Prevail HPLC column and a gradient mobile phase of 25 mM potassium dihydrogen phosphate (pH 2.5) and acetonitrile were employed. Under optimum conditions, the calibrations of both types of acids demonstrated satisfactory correlation coefficients of  ≥0.990, with limits of detection ranging from 0.02 to 395 mM. The developed method demonstrated the profiles of acids in field and concentrated latex of the same batch. Moreover, the evolution of the profiles of all studied acids in both types of latex during a 3-month period was also revealed.

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It’s good to see a progress in research on rubber in Thailand. Salute!

I like to know more but the $49 for the article puts it out of my curiosity range. Sigh!