UV Protection Effect of Natural Dyed Cotton Using Flos Sophorae

UV protection effect of cotton dyed with Flos Sophorae (Sophora Japonica L.) extracted with acid hydrolysis

“…The UPF values obtained from the cotton dyed with hydrolyzed extract was in the range of 10.84-13.80. These values are lower than the UPF value which can be labeled on the garment that is designed for the purpose of UV protection (Gorjanc et al, 2014;Narantuya & Ahn, 2020;Sungrubbies, 2022; "Sun protective clothing, " 2021). However, by dyeing with hydrolyzed Flos Sophorae extract the UPF value of the light-weight summer cotton was enhanced to 13.80 which indicated 92.76% blockage of the UV rays as Based on the results it is possible to suggest that the present dyeing method could produce light-weight summer cotton with yellow color which could provide a moderate UV protection for daily summer attire.…”

“…The UPF rating system along with the allowed textile labels designated by the Australian/New Zealand standard, ASTM D6544, ASTM D6603, AATCC 183 etc. is shown in Table 1 (Gorjanc et al, 2014;Narantuya & Ahn, 2020;Sungrubbies, 2022; "Sun protective clothing, " 2021). UPF value of 15 or above is required for a garment to receive the label designating the UV protective garment (Crews & Hustvedt, 2005).…”

“…Sophora Japonica L. (also known as pagoda tree) is widely distributed in Asia, Europe, North America (Gong et al, 2021). Its dried flower bud Flos Sophorae has been used traditionally for dyeing textiles yellow in the presence of aluminum mordant (Chu & Soh, 2002;Gong et al, 2021;Narantuya & Ahn, 2020). The main coloring compounds of Flos Sophorae are quercetin (C 15 H 10 O 7 ) and its glycoside rutin (C 27 H 30 O 16 ) which are the phenolic compounds responsible for the antioxidant, anti-inflammatory, and UV protective characteristics of Flos Sophorae (Fig.…”

“…(1) EWT = 1 UPF Table 1 UPF ratings and corresponding labels allowed for UV protective clothing (Gorjanc et al, 2014;Narantuya & Ahn, 2020;Sungrubbies, 2022 Among the many UV protective compounds found in plants, quercetin and rutin are the most extensively studied substances (Cefali et al, 2016). Quercetin has higher UV protection over rutin in both SPF (Sun protection factor) and UPF (Ultraviolet protection factor) values (Choquenet et al, 2008;Kostyuk et al, 2018;Monsalve-Bustamante et al, 2020;Narantuya & Ahn, 2020;Zhou & Tang, 2017).…”

“…(1) EWT = 1 UPF Table 1 UPF ratings and corresponding labels allowed for UV protective clothing (Gorjanc et al, 2014;Narantuya & Ahn, 2020;Sungrubbies, 2022 Among the many UV protective compounds found in plants, quercetin and rutin are the most extensively studied substances (Cefali et al, 2016). Quercetin has higher UV protection over rutin in both SPF (Sun protection factor) and UPF (Ultraviolet protection factor) values (Choquenet et al, 2008;Kostyuk et al, 2018;Monsalve-Bustamante et al, 2020;Narantuya & Ahn, 2020;Zhou & Tang, 2017). Currently, quercetin is a widely used sunscreen agent in many facial cosmetic products (INCIDecoder, 2022) Owing to the physiological effect of quercetin and rutin, dyeing cotton with Flos Sophorae would produce a yellow colored cotton with antioxidant, anti-inflammatory, and UV protective function.…”