Abstract
Saliva has garnered a lot of interest as a non-invasive, easy to collect, and biochemical rich sample for attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) based disease diagnosis. Although a large number of studies have explored its potential, the preparation methods used differ greatly. For large scale clinical studies to aid translation into clinics, the collection/processing methodology needs to be standardized. Therefore, in this study, we explored different saliva collection (spitting, method A/cotton soaking, method B) and processing protocols (unprepared, TS; supernatant from the centrifugation, CS; and drying, C) to find which gives the best ATR-FTIR signals. Analysis showed highest proteins, carbohydrates, amino acids, and nucleic acid + proteins/lipids in BTS, BCS, ACS, and BC, respectively. Notably, only BC shows a 1377 cm−1 nucleic acid band that is also uniquely identified in multivariate analysis. We conclude that the collection-processing protocol should be based on a biochemical component that best gives a differential diagnosis.
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Acknowledgments
The authors would like to thank the Coordenaçào de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the Breno Pupin scholarship (CAPES PNPD 20132078-330510110009P0), Daniele Riêra Paschotto (CAPES, PROSUC, Financing Code 001) and Tanmoy T. Bhattacharjee (PNPD/CAPES/ 2016) scholarship.
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Paschotto, D.R., Pupin, B., Bhattacharjee, T.T. et al. Saliva Preparation Method Exploration for ATR-FTIR Spectroscopy: Towards Bio-fluid Based Disease Diagnosis. ANAL. SCI. 36, 1059–1064 (2020). https://doi.org/10.2116/analsci.20P029
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DOI: https://doi.org/10.2116/analsci.20P029