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. 2020 Spring;19(2):153-159.
doi: 10.22037/ijpr.2019.1100790.

Simultaneous Spectrophotometric Determination of Trigonelline, Diosgenin and Nicotinic Acid in Dosage Forms Prepared from Fenugreek Seed Extract

Neda Mohamadi  1 , Mostafa Pournamdari  2 , Fariba Sharififar  3 , Mehdi Ansari  4
Affiliations

Simultaneous Spectrophotometric Determination of Trigonelline, Diosgenin and Nicotinic Acid in Dosage Forms Prepared from Fenugreek Seed Extract

Neda Mohamadi et al. Iran J Pharm Res. 2020 Spring.

Abstract

Mathematical algorithms offer a useful method for quantitative analysis of compounds in multi-component mixtures to overcome the overlapping problems occurred in UV spectrophotometry. The aim of this study is to develop a method for simultaneous determination of bioactive compounds in herbal dosage forms produced from fenugreek extract. A UV- spectrophotometric method based on mathematical algorithm was used to simultaneous determination of trigonelline (TRG), diosgenin (DI), and nicotinic acid (NA). The maximum absorbance (λmax) was determined to be 232.65 nm, 296.23 nm, and 262.60 nm for TRG, DI, and NA, respectively. The calibration curves showed good linearity for all analytes in the concentration range of 1-20 μg/mL (R2=0.9995, 0.9997, 0.9994 for TRG, DI and NA, respectively). The Intra- and inter-day precisions were in the range of 1.1-10.7% and 1.2-8.2%, respectively. The accuracy of the method was 96.0% for TRG, 92.9% for DI, and 104.2% for NA. The limits of detection (LOD) and quantification (LOQ) were found to be 0.91 and 3.06 µg/mL for TRG, 0.99, and 3.30 µg/mL for DI and 0.33 and 1.10 µg/mL for NA. The validated method was applied for determination of the analytes in the tablet, capsule and thin film dosage forms prepared from the fenugreek seed extract. The mean recovery percentages of the analytes were in the range of 90.0-97.4%, 85.6-105.4%, and 90.0-99.0% for tablet, capsule, and film dosage forms, respectively. Generally, the validated method could be a good candidate for routine spectrophotometric determination of the analytes without any necessity for pre-analysis extraction.

Keywords: Diosgenin; Fenugreek; Herbal Dosage Forms; Nicotinic Acid; Simultaneous determination; Spectrophotometry; Trigonelline.

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Figures

Figure 1
Figure 1
Chemical structures of trigonelline, diosgenin and nicotinic acid
Figure 2.
Figure 2.
Zero-order (a) and Third-derivative (b) UV spectra of standard TRG, DI and NA at concentration of 10 µg/mL
Figure 3.
Figure 3.
UV-absorption spectra of 100 µg/mL of the table, capsule and thin film dosage forms of fenugreek extract
See this image and copyright information in PMC

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