Flow injection spectrophotometric determination of polyhexamethylene biguanide hydrochloride in contact-lens detergents using anionic dyes

Takashi Masadome, Shota Oguchi, Teruyuki Kobayashi, Toshiaki Hattori

Research output: Contribution to journalArticle

Abstract

Background: A cationic polyelectrolyte, polyhexamethylene biguanide hydrochloride (PHMB), is widely used for disinfectants in personal-care products for cosmetics and toiletries. Several colloidal titration methods for the determination of PHMB are very tedious and time-consuming. A Flow Injection Analysis (FIA) is a very advantageous analytical method because of its ease of handling, high reproducibility and high sampling rate. Therefore, the development of a simple and sensitive FIA method for the determination of PHMB is required. In this paper, we report the FIA method for the determination of PHMB based on the electrostatic and hydrophobic interactions between an anionic dye, Bromocresol purple (BCP) and PHMB. Methods: The FIA manifold consists of a two-channel system which is composed of a double plunger pump equipped with a sample injector, a flow-through type spectrophotometer and a strip chart recorder. A sample solution (140 μL) of PHMB was injected into a distilled and deionized water stream. This stream was subsequently merged with a reagent solution stream of a solution of 20 μM BCP adjusted to pH 8.0. The absorbance of ion associate formed between BCP and PHMB was measured at 588 nm. Results: The absorption spectra of several anionic dye (10 μM) with PHMB (50 μM) were measured at 400-750 nm by changing pH of the solution. The wavelength at the largest change in the absorbance between the mixed PHMB solution and the reagent blank, and the change of the absorbance at the wavelength was examined. When BCP is used as the anionic dye, the largest change in the absorbance was obtained at 588 nm and the change of the absorbance at the wavelength was-0.56 at pH = 8.0. From the results, BCP was selected as the anionic dye for the FIA determination of PHMB. Under the optimal FIA conditions, a linear relationship between the peak height and concentration of PHMB was obtained in the concentration range from 2.0 to 10.0 μM. The present FIA method was applied to the determination of PHMB in contact-lens detergents. Conclusion: A new spectrophotometric FIA method was developed for the determination of PHMB, based on electrostatic and hydrophobic interactions between PHMB and the anionic dye, BCP. Under the optimal flow conditions of the FIA system, a good linear relationship between peak heights and concentrations of PHMB in a concentration range from 2.0 to 10.0 μM was obtained. The present FIA method uses more simpler instrumentation, and is more rapid (sample throughput: 13 samples h-1) than other reported methods, and has the advantages of high sensitivity and no toxic organic solvent than other analytical methods. The present method will be very useful for the determination of PHMB in commercially available contact-lens detergents and also be applied to the determination of PHMB in the sample solution, which has similar matrix to the contact-lens detergent.

Original languageEnglish
Pages (from-to)446-451
Number of pages6
JournalCurrent Analytical Chemistry
Volume14
Issue number5
DOIs
Publication statusPublished - 2018 Jan 1

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Contact lenses
Detergents
Coloring Agents
Bromcresol Purple
polyhexamethylene biguanide
Wavelength
Electrostatics
Cosmetics

Keywords

  • Anionic dyes
  • Bromocresol purple
  • Contact-lens detergents
  • Flow injection analysis
  • Polyhexamethylene biguanide hydrochloride
  • Spectrophotometric analysis

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Flow injection spectrophotometric determination of polyhexamethylene biguanide hydrochloride in contact-lens detergents using anionic dyes. / Masadome, Takashi; Oguchi, Shota; Kobayashi, Teruyuki; Hattori, Toshiaki.

In: Current Analytical Chemistry, Vol. 14, No. 5, 01.01.2018, p. 446-451.

Research output: Contribution to journalArticle

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abstract = "Background: A cationic polyelectrolyte, polyhexamethylene biguanide hydrochloride (PHMB), is widely used for disinfectants in personal-care products for cosmetics and toiletries. Several colloidal titration methods for the determination of PHMB are very tedious and time-consuming. A Flow Injection Analysis (FIA) is a very advantageous analytical method because of its ease of handling, high reproducibility and high sampling rate. Therefore, the development of a simple and sensitive FIA method for the determination of PHMB is required. In this paper, we report the FIA method for the determination of PHMB based on the electrostatic and hydrophobic interactions between an anionic dye, Bromocresol purple (BCP) and PHMB. Methods: The FIA manifold consists of a two-channel system which is composed of a double plunger pump equipped with a sample injector, a flow-through type spectrophotometer and a strip chart recorder. A sample solution (140 μL) of PHMB was injected into a distilled and deionized water stream. This stream was subsequently merged with a reagent solution stream of a solution of 20 μM BCP adjusted to pH 8.0. The absorbance of ion associate formed between BCP and PHMB was measured at 588 nm. Results: The absorption spectra of several anionic dye (10 μM) with PHMB (50 μM) were measured at 400-750 nm by changing pH of the solution. The wavelength at the largest change in the absorbance between the mixed PHMB solution and the reagent blank, and the change of the absorbance at the wavelength was examined. When BCP is used as the anionic dye, the largest change in the absorbance was obtained at 588 nm and the change of the absorbance at the wavelength was-0.56 at pH = 8.0. From the results, BCP was selected as the anionic dye for the FIA determination of PHMB. Under the optimal FIA conditions, a linear relationship between the peak height and concentration of PHMB was obtained in the concentration range from 2.0 to 10.0 μM. The present FIA method was applied to the determination of PHMB in contact-lens detergents. Conclusion: A new spectrophotometric FIA method was developed for the determination of PHMB, based on electrostatic and hydrophobic interactions between PHMB and the anionic dye, BCP. Under the optimal flow conditions of the FIA system, a good linear relationship between peak heights and concentrations of PHMB in a concentration range from 2.0 to 10.0 μM was obtained. The present FIA method uses more simpler instrumentation, and is more rapid (sample throughput: 13 samples h-1) than other reported methods, and has the advantages of high sensitivity and no toxic organic solvent than other analytical methods. The present method will be very useful for the determination of PHMB in commercially available contact-lens detergents and also be applied to the determination of PHMB in the sample solution, which has similar matrix to the contact-lens detergent.",
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T1 - Flow injection spectrophotometric determination of polyhexamethylene biguanide hydrochloride in contact-lens detergents using anionic dyes

AU - Masadome, Takashi

AU - Oguchi, Shota

AU - Kobayashi, Teruyuki

AU - Hattori, Toshiaki

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N2 - Background: A cationic polyelectrolyte, polyhexamethylene biguanide hydrochloride (PHMB), is widely used for disinfectants in personal-care products for cosmetics and toiletries. Several colloidal titration methods for the determination of PHMB are very tedious and time-consuming. A Flow Injection Analysis (FIA) is a very advantageous analytical method because of its ease of handling, high reproducibility and high sampling rate. Therefore, the development of a simple and sensitive FIA method for the determination of PHMB is required. In this paper, we report the FIA method for the determination of PHMB based on the electrostatic and hydrophobic interactions between an anionic dye, Bromocresol purple (BCP) and PHMB. Methods: The FIA manifold consists of a two-channel system which is composed of a double plunger pump equipped with a sample injector, a flow-through type spectrophotometer and a strip chart recorder. A sample solution (140 μL) of PHMB was injected into a distilled and deionized water stream. This stream was subsequently merged with a reagent solution stream of a solution of 20 μM BCP adjusted to pH 8.0. The absorbance of ion associate formed between BCP and PHMB was measured at 588 nm. Results: The absorption spectra of several anionic dye (10 μM) with PHMB (50 μM) were measured at 400-750 nm by changing pH of the solution. The wavelength at the largest change in the absorbance between the mixed PHMB solution and the reagent blank, and the change of the absorbance at the wavelength was examined. When BCP is used as the anionic dye, the largest change in the absorbance was obtained at 588 nm and the change of the absorbance at the wavelength was-0.56 at pH = 8.0. From the results, BCP was selected as the anionic dye for the FIA determination of PHMB. Under the optimal FIA conditions, a linear relationship between the peak height and concentration of PHMB was obtained in the concentration range from 2.0 to 10.0 μM. The present FIA method was applied to the determination of PHMB in contact-lens detergents. Conclusion: A new spectrophotometric FIA method was developed for the determination of PHMB, based on electrostatic and hydrophobic interactions between PHMB and the anionic dye, BCP. Under the optimal flow conditions of the FIA system, a good linear relationship between peak heights and concentrations of PHMB in a concentration range from 2.0 to 10.0 μM was obtained. The present FIA method uses more simpler instrumentation, and is more rapid (sample throughput: 13 samples h-1) than other reported methods, and has the advantages of high sensitivity and no toxic organic solvent than other analytical methods. The present method will be very useful for the determination of PHMB in commercially available contact-lens detergents and also be applied to the determination of PHMB in the sample solution, which has similar matrix to the contact-lens detergent.

AB - Background: A cationic polyelectrolyte, polyhexamethylene biguanide hydrochloride (PHMB), is widely used for disinfectants in personal-care products for cosmetics and toiletries. Several colloidal titration methods for the determination of PHMB are very tedious and time-consuming. A Flow Injection Analysis (FIA) is a very advantageous analytical method because of its ease of handling, high reproducibility and high sampling rate. Therefore, the development of a simple and sensitive FIA method for the determination of PHMB is required. In this paper, we report the FIA method for the determination of PHMB based on the electrostatic and hydrophobic interactions between an anionic dye, Bromocresol purple (BCP) and PHMB. Methods: The FIA manifold consists of a two-channel system which is composed of a double plunger pump equipped with a sample injector, a flow-through type spectrophotometer and a strip chart recorder. A sample solution (140 μL) of PHMB was injected into a distilled and deionized water stream. This stream was subsequently merged with a reagent solution stream of a solution of 20 μM BCP adjusted to pH 8.0. The absorbance of ion associate formed between BCP and PHMB was measured at 588 nm. Results: The absorption spectra of several anionic dye (10 μM) with PHMB (50 μM) were measured at 400-750 nm by changing pH of the solution. The wavelength at the largest change in the absorbance between the mixed PHMB solution and the reagent blank, and the change of the absorbance at the wavelength was examined. When BCP is used as the anionic dye, the largest change in the absorbance was obtained at 588 nm and the change of the absorbance at the wavelength was-0.56 at pH = 8.0. From the results, BCP was selected as the anionic dye for the FIA determination of PHMB. Under the optimal FIA conditions, a linear relationship between the peak height and concentration of PHMB was obtained in the concentration range from 2.0 to 10.0 μM. The present FIA method was applied to the determination of PHMB in contact-lens detergents. Conclusion: A new spectrophotometric FIA method was developed for the determination of PHMB, based on electrostatic and hydrophobic interactions between PHMB and the anionic dye, BCP. Under the optimal flow conditions of the FIA system, a good linear relationship between peak heights and concentrations of PHMB in a concentration range from 2.0 to 10.0 μM was obtained. The present FIA method uses more simpler instrumentation, and is more rapid (sample throughput: 13 samples h-1) than other reported methods, and has the advantages of high sensitivity and no toxic organic solvent than other analytical methods. The present method will be very useful for the determination of PHMB in commercially available contact-lens detergents and also be applied to the determination of PHMB in the sample solution, which has similar matrix to the contact-lens detergent.

KW - Anionic dyes

KW - Bromocresol purple

KW - Contact-lens detergents

KW - Flow injection analysis

KW - Polyhexamethylene biguanide hydrochloride

KW - Spectrophotometric analysis

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