Effect of Natural Dyeing Using Flos Sophora Japonica L. on the UV Protection of Cotton Fabric
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The purpose of this research was to investigate the effect of UV protection function of cotton fabric dyed with Flos Sophora japonica L. The study also aimed to out whether the amount of rutin or quercetin fixed on the fiber through dyeing with Flos Sophora japonicaL. has effect on the degree of UV protection of the dyed cotton fabric. UV protection of dyed samples was measured using the Ultraviolet transmittance analyzer (UV-2000F, Labsphere) based on the American Society for Testing and Materials (ASTM) Test method 183. Four measurements were taken from each sample. High performance liquid chromatography-diode array detector (HPLC-DAD, Ultimate-3000, Dionex, USA) was used to confirm rutin and quercetin fixed on the dyed cotton. Following ASTM D6603, Cotton samples dyed using the dyebath containing Flos Sophora japonicaL. extract and water 1:2 ratio at 70°C for 60 minutes or 90°C for 30~60 minutes, and all quercetin dyed cotton samples showed ‘Good UV Protection’ rating indicating that the samples block approximately 93.3~95.8% UV radiation from the sun. The UVA and UVB transmittance of these cotton samples were lower than 9.76% and 6.49% consecutively. The results indicate that cotton dyed with Flos Sophora japonica L. does have UV protective function and that the protection increases as higher dye concentration is applied. UV protection of cotton dyed with Flos Sophora japonica L. is due to the presence of quercetin in Flos Sophora japonica L. extract and its fixation on cotton fabric.