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Electrochemical detection method for quinhydrone

A detection method and electrochemical technology, applied in the direction of electrochemical variables of materials, measurement devices, scientific instruments, etc., can solve the problems of hydroquinone-induced mutation, liver and kidney effects, cytotoxicity, etc., achieving stable properties, simple detection process, and preparation. Simple process effect

Inactive Publication Date: 2009-11-18
NORTHWEST NORMAL UNIVERSITY
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Problems solved by technology

However, hydroquinone is highly mutagenic and cytotoxic, and excessive application can cause chloasma, etc., and long-term accumulation will leave terrible scars, and may also affect the liver and kidneys

Method used

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  • Electrochemical detection method for quinhydrone
  • Electrochemical detection method for quinhydrone
  • Electrochemical detection method for quinhydrone

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Embodiment Construction

[0025] In order to illustrate content of the present invention more clearly, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0026] The water used in the experiment process was double distilled water, and the reagents used in the experiment were all analytically pure. The carboxylation of multi-walled carbon nanotubes was carried out by ultrasonication for 8 hours with concentrated hydrochloric acid and hydrogen peroxide with a volume ratio of 4:1, and then washed to neutral. Durability, dry at 70°C before use.

[0027] (1), the instrument and reagent used in this embodiment

[0028] A multi-channel electrochemical workstation (VMP2, Princeton Instruments, USA) was used for AC impedance experiments and cyclic voltammetry experiments, and a quartz tube heating automatic double pure water still (1810B, Shanghai Asia-Pacific Technology Glass Co., Ltd.) was used for secondary distillation. distilled water. ...

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Abstract

The invention provides an electrochemical detection method for quinhydrone, which comprises the following steps: jointly inserting a bare glassy carbon electrode, a multi-wall carbon nano tube and a room-temperature ionic liquid glue-modified glassy carbon electrode into an electrochemical detection cell filled with phosphate buffer solution of quinhydrone to be detected together with a reference electrode and a platinum counter electrode respectively, and carrying out electrochemical cyclic voltammetry to obtain cyclic voltammetry peak current response (Ip) of the quinhydrone which is 43 times of bare glassy carbon electrode peak current response; and carrying out electrochemical impedance scanning in an electrochemical detection cell of potassium chloride electrolyte solution containing red potassium prussiate / yellow prussiate probe molecules to obtain charge transfer impedance value of the multi-wall carbon nano tube and the room-temperature ionic liquid glue. The Rct of the charge transfer impedance value of the multi-wall carbon nano tube and the room-temperature ionic liquid glue is close to 0 omega, while the Rct of the charge transfer impedance value of the bare glassy carbon electrode is about 1,000 omega. Therefore, the multi-wall carbon nano tube and the room-temperature ionic liquid glue have good electric conductivity and greatly increase the electronic transmission speed. The method for detecting the quinhydrone on the surfaces of the multi-wall carbon nano tube and the room-temperature ionic liquid glue-modified glassy carbon electrode is convenient and quick, and realizes electrochemical detection for the quinhydrone in cosmetics.

Description

technical field [0001] The invention relates to a simple, sensitive and rapid electrochemical method for detecting hydroquinone. Background technique [0002] In recent years, domestic whitening and freckle-removing products have become one of the mainstream products in skin care products. Statistics show that in China, with a population of 1.3 billion, the annual market share of freckle-removing beauty products has exceeded 10 billion yuan. Due to the huge profits, cosmetics companies producing whitening and freckle-removing products are also increasing. [0003] Hydroquinone, hydroquinone, molecular formula [C 6 h 4 (OH) 2 ], molecular weight 110.10, dihydric phenol, white crystal, boiling point 286.2°C, soluble in water, and compatible with alcohol in any proportion. Because hydroquinone has the function of antioxidant and complexing agent, it is widely used in the field of daily chemical industry. Hydroquinone directly acts on tyrosinase, blocking the process of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416G01N27/48G01N27/30
Inventor 刘秀辉丁珍何月华董存武张凯卢小泉
Owner NORTHWEST NORMAL UNIVERSITY
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