• P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

A simple method to determine folic acid in soft-capsule-type dietary supplements using heat and ultrasound-assisted dissolution and liquid chromatography

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2024, v.37 no.6, pp.339-346
https://doi.org/10.5806/AST.2024.37.6.339
Kim Young Min (Dankook University)
Kim Jun Yeop (Dankook University)
Shin Ye Bin (Dankook University)
Kwon Min Kyeong (Dankook University)
KIm Jin Hwan (Dankook University)
Kim Yoon Gyoon (Dankook University)
Lee Dong-Kyu (Chung-Ang University)
Han Sang Beom (Chung-Ang University)
Choi Yong Seok (Dankook University)
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Abstract

Folic acid, a form of vitamin B9, plays a critical role in producing healthy blood cells, developing the fetal nervous system, and breaking down homocysteine to maintain its optimal blood level. Consequently, a wide variety of dietary supplements containing folic acid are available in the market, including tablets, powders, hard capsules, and soft capsules. However, our research group recently discovered that the folic acid assay (II) specified in the Health Functional Food Code of South Korea is not applicable to soft-capsule-type folic acid dietary supplements. To address this issue, a simple method for determining folic acid content in softcapsule-type dietary supplements was developed. This approach combines heat and ultrasound-assisted dissolution with liquid chromatography, utilizing a UV absorbance detector. The method underwent validation following the guidelines set by the Ministry of Food and Drug Safety. All validation parameters examined in this study met the acceptable criteria outlined in the guidelines. These parameters include selectivity, linearity (r2 ≥ 0.999), a lower limit of quantification (0.820 μg/mL), accuracy (expressed as recovery between 100.36 % and 102.81 %), repeatability (with relative standard deviation (RSD) values for recovery ranging from 0.26 % to 0.45 %), and reproducibility (with an RSD value of 0.09 % for interlaboratory recovery). Furthermore, the practical applicability of the validated method was confirmed by analyzing soft-capsule-type folic acid dietary supplements. The experimental content-to-nominal content ratio ranged from 108.60 to 113.27 %. Therefore, the present method has the potential to enhance the safety management system for dietary supplements in South Korea.

keywords
folic acid, heat and ultrasound-assisted dissolution, liquid chromatography, soft capsule, dietary supplements, Health Functional Food Code


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