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Intra‐laboratory validation of microplate methods for total phenolic content and antioxidant activity on polyphenolic extracts, and comparison with conventional spectrophotometric methods

Bobo‐García, Gloria, Davidov‐Pardo, Gabriel, Arroqui, Cristina, Vírseda, Paloma, Marín‐Arroyo, María R, Navarro, Montserrat·2015·Journal of the Science of Food and Agriculture

Abstract

BACKGROUND: Total phenolic content (TPC) and antioxidant activity (AA) assays in microplates save resources and time, therefore they can be useful to overcome the fact that the conventional methods are time‐consuming, labour intensive and use large amounts of reagents. An intra‐laboratory validation of the Folin–Ciocalteu microplate method to measure TPC and the 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) microplate method to measure AA was performed and compared with conventional spectrophotometric methods. RESULTS: To compare the TPC methods, the confidence intervals of a linear regression were used. In the range of 10–70 mg L−1 of gallic acid equivalents (GAE), both methods were equivalent. To compare the AA methodologies, the F‐test and t‐test were used in a range from 220 to 320 µmol L−1 of Trolox equivalents. Both methods had homogeneous variances, and the means were not significantively different. The limits of detection and quantification for the TPC microplate method were 0.74 and 2.24 mg L−1 GAE and for the DPPH 12.07 and 36.58 µmol L−1 of Trolox equivalents. The relative standard deviation of the repeatability and reproducibility for both microplate methods were ≤6.1%. The accuracy ranged from 88% to 100%. CONCLUSION: The microplate and the conventional methods are equals in a 95% confidence level. © 2014 Society of Chemical Industry

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Metadata

Authors
Bobo‐García, G., Davidov‐Pardo, G., Arroqui, C., Vírseda, P., Marín‐Arroyo, M. R., & Navarro, M.
Venue
Journal of the Science of Food and Agriculture
Publisher
Wiley
Published
2014-05-21
Volume
95
Issue
1
Pages
204-209
ISSN
  • 0022-5142 (ISSN-L)
  • 1097-0010
OpenAlex
W1552103058
Cited by
322
References
14
FWCI
3.79
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Intra‐laboratory validation of microplate methods for total phenolic content and antioxidant activity on polyphenolic extracts, and comparison with conventional spectrophotometric methods. https://app.cochat.ai/papers/10.1002/jsfa.6706
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Bobo‐García, G., Davidov‐Pardo, G., Arroqui, C., Vírseda, P., Marín‐Arroyo, M. R., & Navarro, M. (2015). Intra‐laboratory validation of microplate methods for total phenolic content and antioxidant activity on polyphenolic extracts, and comparison with conventional spectrophotometric methods. Journal of the Science of Food and Agriculture. https://doi.org/10.1002/jsfa.6706

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