Abstract
A simple and effective capillary electrophoresis (CE) method for the separation and quantification of d-allose in the presence of its process impurities, namely sucrose, d-glucose, d-fructose, d-psicose, and d-altrose, has been developed and validated. The optimum conditions for the separation with an acceptable resolution are found to be as follows: background electrolyte (BGE): 36 mM of Na2HPO4 and 130 mM NaOH; pH: 12.6; and voltage: 18 kV with direct UV detection at 265 nm. The present method overcomes the limitations of existing analytical method like sample preparation, poor resolution, and sensitivity. The method is optimized with the established standard curves for d-allose and its related impurities in the concentration range 0.25 to 3.0 mM with coefficient of determinations > 0.99 and the limit of detection (LOD) in the range of 0.11 to 0.20 mM. Separation of d-allose and its impurities present in the mixture is achieved using the current method with good resolution, linearity, and reproducibility. The present method is suitable for the analysis of the final product in the enzymatically synthesized d-allose and also for reaction monitoring of in-process samples.
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Acknowledgments
We thank Koneru Lakshmaiah Education Foundation, Green Fields, Vaddeswaram, Guntur District, Andhra Pradesh, and the Management of Vimta labs, Hyderabad, for providing us the necessary facilities to carry out this work. We thank Dr. U. Satyanarayana, senior marketing manager, Waters India Pvt Ltd., Hyderabad, India, for his constant guidance and critical suggestions while the work is in progress.
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SRKS and KR designed and executed the experiments.
SR analyzed the data and drafted the manuscript.
GSSK and SR drafted the manuscript.
SRKS, KR, and SRS helped in providing scientific and technical inputs, interpreting the data, and reviewing the manuscript.
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Sri Rama Krishna Surapureddi declares no conflict of interest. Kunta Ravindhranath declares no conflict of interest. Ghantasala S Sameer Kumar declares no conflict of interest. Sreedhar Reddy Sappidi declares no conflict of interest.
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Surapureddi, S.R.K., Ravindhranath, K., Sameer Kumar, G.S. et al. Separation and Determination of d-Allose in Presence of Process-Related Impurities by Capillary Electrophoresis. Food Anal. Methods 13, 2269–2278 (2020). https://doi.org/10.1007/s12161-020-01842-z
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DOI: https://doi.org/10.1007/s12161-020-01842-z