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Viana C, Ribeiro SM, Moreira AP, Müller LS, Motta MJ, Monserrat JM, de Carvalho LM, Bohrer D. Quantification of Alpha Lipoic Acid in Pharmaceutical Products by HPLC with Pulsed Amperometric Detection at a Gold Electrode. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180418155615] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Alpha-lipoic acid (ALA) has become a common ingredient in food supplements
and multivitamin formulas. ALA is widely used as therapy for preventing diabetic polyneuropathies,
scavenges free radicals, and restores intracellular glutathione levels. This study aimed to develop
a simple and fast analytical method to determine ALA content in dietary supplements using highperformance
liquid chromatography with pulsed amperometric detection (HPLC PAD).
Methods:
ALA was analyzed by HPLC in a mobile phase composed of 25 mmol/L potassium phosphate
in 50% (v/v) acetonitrile (pH 4.0) and PAD at a gold electrode (vs. solid-phase hydrogen reference
electrode). The PAD cycle was performed by applying a detection potential (E1) of +0.7 V for 0.4 s, an
oxidation potential (E2) of +1.0V for 0.4 s and a reduction potential (E3) of -0.2 V for 1.2 s.
Results:
The runtime method was shown a rapid procedure for the analysis of α-lipoic acid. The sampling
rate of 8 injections per hour was attained and measurements of the reproducibility of successive
injections (20 µL) showed an RSD of 1.89% for 16 successive injections. The method presented low
quantification limit of 0.21 mg/L. The industrialized ALA-based supplements ranged from to 97.8 to
104.1%, while manipulated capsules ranged from 69.2 to 95.4%.
Conclusion:
Electrochemical detector has been presented as an effective alternative for ALA determination,
which has weakly UV-absorbing. This detection has the benefits of sensitivity, simplicity and
low costs. The developed HPLC-DAD method proposes to be analytical tool applicable to quality control
of ALA supplements.
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Affiliation(s)
- Carine Viana
- Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil
| | - Sandra M. Ribeiro
- Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil
| | - Ana P.L. Moreira
- Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil
| | - Larissa S. Müller
- Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil
| | | | - José M. Monserrat
- Departamento de Ciencias Fisiologicas, Fundacao Universidade Federal do Rio Grande (FURG), Av. Italia km 8, Campus Carreiros, 96.201-900, Rio Grande, RS, Brazil
| | - Leandro M. de Carvalho
- Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil
| | - Denise Bohrer
- Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil
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Chen X, Chu B, Xi H, Xu J, Lai L, Peng H, Deng D, Huang G. Determination of chlorine ions in raw milk by pulsed amperometric detection in a flow injection system. J Dairy Sci 2018; 101:9647-9658. [PMID: 30146288 DOI: 10.3168/jds.2018-14395] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 06/28/2018] [Indexed: 11/19/2022]
Affiliation(s)
- Xingguang Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Beibei Chu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Huiting Xi
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Junjun Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Lizhi Lai
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Huifeng Peng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Danwen Deng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Ganhui Huang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China.
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Amperometric biosensors precision improvement. Application to phenolic pollutants determination. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.09.106] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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de Carvalho LM, Viana C, Moreira APL, do Nascimento PC, Bohrer D, Motta MJ, da Silveira GD. Pulsed amperometric detection (PAD) of diuretic drugs in herbal formulations using a gold electrode following ion-pair chromatographic separation. J Solid State Electrochem 2013. [DOI: 10.1007/s10008-013-2115-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Levent A, Keskin E, Yardım Y, Şentürk Z. Electrooxidation of thiourea and its square-wave voltammetric determination using pencil graphite electrode. REVIEWS IN ANALYTICAL CHEMISTRY 2011; 30. [DOI: https:/doi.org/10.1515/revac.2011.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2024]
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Ngamchana S, Surareungchai W. Sub-millimolar determination of formalin by pulsed amperometric detection. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2004.01.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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