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Photoreversible polymer-surfactant micelles using the molecular recognition of α-cyclodextrin.

Langmuir : the ACS journal of surfaces and colloids (2013-02-05)
Zhen-Qiang Dong, Ya Cao, Xiao-Juan Han, Min-Min Fan, Qi-Juan Yuan, Yi-Fu Wang, Bang-Jing Li, Sheng Zhang
RESUMEN

Photoreversible micelles were achieved by a combination of commercially available components sodium alginate (Alg), tetradecyltrimethylammonium bromide (TTAB), α-cyclodextrin (α-CD), and 4-(phenylazo)benzoic acid (PBA). Under visible light irradiation, α-CD interacted more favorably with PBA than with alkyl chains of TTAB. Therefore, polymer-surfactant micelles were formed by the self-assembly of Alg and TTAB through electrostatic attraction. After UV irradiation, micelles were disrupted because PBA in the cis form lost its ability to complex with α-CD, and then the latter was interacted with TTAB to prevent the association of alkyl chains of TTAB. On alternating irradiation of this quaternary system with UV and visible light, this reversible micellization process can be recycled many times.

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Sigma-Aldrich
α-Cyclodextrin, ≥98%
Sigma-Aldrich
Benzoic acid, ACS reagent, ≥99.5%
Sigma-Aldrich
α-Cyclodextrin, Produced by Wacker Chemie AG, Burghausen, Germany, Life Science, 98.0-101.0% cyclodextrin basis (HPLC)
Sigma-Aldrich
Myristyltrimethylammonium bromide, ≥99%
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Benzoic acid, ≥99.5%, FCC, FG
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Benzoic acid, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
α-Cyclodextrin, produced by Wacker Chemie AG, Burghausen, Germany, ≥98.0% (HPLC)
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Benzoic acid, analytical standard, (for the calibration of the melting point system), traceable to primary standards (LGC)
Sigma-Aldrich
Benzoic acid, ReagentPlus®, 99%
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Trimethyl-tetradecylammonium chloride, ≥98.0% (AT)
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Melting point standard 121-123°C, analytical standard
Sigma-Aldrich
α-Cyclodextrin, powder, BioReagent, suitable for cell culture, ≥98%
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Benzoic acid, meets analytical specification of Ph. Eur., BP, USP, FCC, E210, 99.5-100.5% (alkalimetric)
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Benzoic acid, natural, ≥99.5%, FCC, FG
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Benzoic acid, reference material for titrimetry, certified by BAM, >99.5%
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Benzoic acid, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.9% (alkalimetric)
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Benzoic acid, purified by sublimation, ≥99%
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Benzoic acid, Standard for quantitative NMR, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
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Myristyltrimethylammonium bromide, 98% (AT)
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Potassium benzoate, ReagentPlus®, 99%
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α-Cyclodextrin, purum, ≥98.0% (HPLC)
Sigma-Aldrich
Benzoic acid, SAJ special grade, ≥99.5%
Sigma-Aldrich
Benzoic acid, SAJ first grade, ≥99.5%
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Myristyltrimethylammonium bromide, suitable for ion pair chromatography, LiChropur, ≥99.0% (AT)