Method for detecting polyhexamethylene biguanide hydrochloride in textiles

A method for detecting polyhexamethylene biguanide hydrochloride in textiles, characterized in that the method comprises the following steps:

• (1) sample pretreatment:
• adding a textile under test into an extraction solvent, and performing ultrasonic extraction and filtration to obtain a sample test solution;
• and
• (2) high-performance liquid chromatography detection:
• analyzing the sample test solution under the following chromatographic conditions to obtain a chromatogram, and determining a content of the polyhexamethylene biguanide hydrochloride in the textile through analytical chemistry calculation based on the chromatogram, wherein
• in step (1), the extraction solvent comprises an ammonium chloride solution and methanol, a volume fraction of the ammonium chloride solution is 20% to 70%, a concentration of the ammonium chloride solution is 0.5 mol/L to 2.0 mol/L, and a pH value of the ammonium chloride solution is 1.5 to 4.0;
• the chromatographic conditions in step (2) comprise:
• chromatographic column:
• C18 liquid chromatographic column or cyano chromatographic column of 4.6×150 mm and 5 μm or 4.6×75 mm and 3.5 μm in size;
• column temperature:
• 30° C. to 50° C.;
• mobile phase A:
• water;
• mobile phase B:
• aqueous phosphoric acid solution, with a volume fraction 0.1‰ to 1.2‰;
• mobile phase C:
• acetonitrile;
• and
• flow rate:
• 0.8 mL/min to 1.2 mL/min.