Abstract
The sulfo-phospho-vanillin assay is a well-known method to measure the lipid content of microalgae. Following hydrolysis with sulfuric acid, a pink color develops after the addition of sulfo-phospho-vanillin and the absorbance at 530 nm is measured. As any colorimetric method, several factors might affect results consistency such as reaction time, matrix effects and sample background color. In this study, the measurement was carried out on freeze-dried samples of Chlorella and Spirulina to assess these impacts. The results showed the increase of absorbance with time even after the usual 30 min resting period. The main observation is a sample background color following acid hydrolysis and phosphoric acid addition, which questions the generally accepted SPV method reaction mechanism.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on request.
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Acknowledgements
The authors thank Carole Lutz and Marie-Pierre Ottermatte of the ENGEES chemistry laboratory (Laboratoire d’Etude des Eaux, LEE) for their technical help during the analyses.
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This study was supported financially and technically by Strasbourg University and the National Engineering School of Water and Environment of Strasbourg (ENGEES).
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Julie Farinacci: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Resource, Writing - Original Draft, Writing - Review & Editing, Visualization. Julien Laurent: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Writing - Review & Editing, Visualization, Supervision.
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Farinacci, J., Laurent, J. Critical assessment of the sulfo-phospho-vanillin method to quantify lipids in freeze-dried microalgae. J Appl Phycol 35, 997–1008 (2023). https://doi.org/10.1007/s10811-023-02930-3
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DOI: https://doi.org/10.1007/s10811-023-02930-3