A microplate spectrophotometric method for analysis of indole-3-carbinol in dietary supplements using p-dimethylaminocinnamaldehyde (DMACA) as a chromogenic reagent
Issued Date
2022-08-09
Resource Type
ISSN
17599660
eISSN
17599679
Scopus ID
2-s2.0-85138157605
Pubmed ID
36039897
Journal Title
Analytical Methods
Volume
14
Issue
35
Start Page
3366
End Page
3374
Rights Holder(s)
SCOPUS
Bibliographic Citation
Analytical Methods Vol.14 No.35 (2022) , 3366-3374
Suggested Citation
Chaisiwamongkhol K., Phonchai A., Pon-In S., Bunchuay T., Limbut W. A microplate spectrophotometric method for analysis of indole-3-carbinol in dietary supplements using p-dimethylaminocinnamaldehyde (DMACA) as a chromogenic reagent. Analytical Methods Vol.14 No.35 (2022) , 3366-3374. 3374. doi:10.1039/d2ay01129h Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/84587
Title
A microplate spectrophotometric method for analysis of indole-3-carbinol in dietary supplements using p-dimethylaminocinnamaldehyde (DMACA) as a chromogenic reagent
Author's Affiliation
Other Contributor(s)
Abstract
This work presents the development of a microplate spectrophotometric method for determination of indole-3-carbinol in dietary supplements. The colorimetric procedure is based on the reaction of indole-3-carbinol with the p-dimethylaminocinnamaldehyde (DMACA) reagent under acidic conditions. The absorbance of the colored product measured at 675 nm was used to determine the target analyte. To achieve optimal spectrophotometric performance, the DMACA reagent concentration, the hydrochloric acid concentration, and the reaction time were optimized. The developed technique performed well under the optimal conditions, with a linear calibration range of 30 to 300 mg L−1 and a high correlation coefficient (r2 = 0.9954). The limit of detection and limit of quantification were 7.8 mg L−1 and 26.2 mg L−1, respectively. This approach demonstrated good repeatability (intra- and inter-day precision) with a % RSD lower than 9.4%, good accuracy with acceptable relative recoveries in the range of 98 to 106%, and high sample throughput (24 detection per min). This simple, rapid, and multi-sample analysis approach for routine analysis of indole-3-carbinol has the potential to be used for the quality control of dietary supplements.