Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.
Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning 530006, China.
Int J Biol Macromol. 2023 May 15;237:124081. doi: 10.1016/j.ijbiomac.2023.124081. Epub 2023 Mar 20.
In order to improve the utilization of industrial lignin as an effective component for ultraviolet (UV) shielding, organic solvent (methanol, ethanol, and acetone) fractionation was applied to improve its UV absorption performance and reduce its apparent color. Physicochemical properties of lignin and lignin-based sunscreens, such as molar mass fraction, functional group content, color change and UV shielding properties, were characterized in detail by GPC, UV spectroscopy, P NMR and HSQC-NMR spectroscopy. The results showed that the color and UV-shielding properties of the soluble fraction were significantly superior to those of the original and insoluble fractions. Different lignin fractions were acted as the only active substance in the pure cream and its UV-shielding properties were compared. Among them, the composite sunscreen by adding 5 wt% acetone fractionated lignin had highest sun protection factor (SPF) value of 6.6, approximately 4.5 times higher than those sunscreens mixed with pristine lignin. Overall, this work offers the potential of industrial lignin in value-added applications such as UV protection and cosmetics.
为了提高工业木质素作为紫外线（UV）屏蔽有效成分的利用率，采用有机溶剂（甲醇、乙醇和丙酮）分级法来提高其紫外吸收性能并降低其表观颜色。通过凝胶渗透色谱（GPC）、紫外光谱、磷核磁共振（P NMR）和异核单量子相干（HSQC-NMR）光谱详细表征了木质素和木质素基防晒霜的物理化学性质，如摩尔质量分数、官能团含量、颜色变化和 UV 屏蔽性能。结果表明，可溶性部分的颜色和 UV 屏蔽性能明显优于原始和不溶性部分。不同木质素部分作为纯乳膏中的唯一活性物质，并比较其 UV 屏蔽性能。其中，添加 5wt%丙酮分级木质素的复合防晒霜的防晒系数（SPF）值最高，达到 6.6，约为混合原木质素的防晒霜的 4.5 倍。总的来说，这项工作为工业木质素在附加值应用，如 UV 保护和化妆品方面提供了潜力。
