Baicalin, an active flavonoid ingredient of Scutellaria baicalensis Georgi, was extracted by heat reflux extraction and showed the same significance UV absorption property with standard baicalin. Active films were prepared from polyvinyl alcohol (PVA) containing baicalin extract by casting method. The effect of baicalin extracts on the UV-blocking, optical, antioxidant property, water vapor permeability, swelling and mechanical properties of the films were studied. UV–vis transmittance spectra showed that PVA films incorporated with baicalin extract blocked ultraviolet light range from 280–400 nm even with low concentration of baicalin (0.5 wt%) and maintain the high transparency in visible spectrum. The outstanding UV-blocking properties of PVA films incorporated with baicalin extract were also confirmed by Rhodamine B degradation. Baicalin conferred antioxidant properties to PVA films as determined by DPPH radical scavenging activity. Due to the interaction between hydroxy groups of baicalin and PVA molecule, water vapor permeability, swelling and elongation at break of the films were decreased accompanied with the increasing in tensile strength and Young’s modulus. FTIR reveal that the interaction between PVA molecules was significant changed by the introduction of baicalin. These results suggest that PVA film incorporated with baicalin extract can be used for the development of functional protective film.

中文翻译：

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黄ba提取物中掺入黄ical苷的紫外线阻滞和抗氧化剂聚乙烯醇薄膜

黄ical素是黄cut的活性黄酮类成分，通过热回流萃取法提取，并显示出与标准黄the素相同的显着紫外吸收性能。通过流延法从含有黄ical苷提取物的聚乙烯醇（PVA）制备活性膜。研究了黄ical苷提取物对薄膜的紫外线阻隔，光学，抗氧化性能，水蒸气渗透性，溶胀和机械性能的影响。紫外可见透射光谱表明，加入黄P苷提取物的PVA薄膜即使在低浓度的黄ical苷（0.5 wt％）的情况下也能阻挡280-400 nm的紫外线，并在可见光谱中保持较高的透明度。罗丹明B降解也证实了掺入黄ba苷提取物的PVA膜具有出色的紫外线阻隔性能。通过DPPH自由基清除活性测定，黄ical苷赋予PVA膜抗氧化性能。由于黄ical苷的羟基与PVA分子之间的相互作用，使薄膜的水蒸气透过率，溶胀和断裂伸长率降低，同时拉伸强度和杨氏模量增加。FTIR显示，通过引入黄in苷，PVA分子之间的相互作用发生了显着变化。这些结果表明，掺入黄ical苷提取物的PVA膜可用于功能性保护膜的开发。随着拉伸强度和杨氏模量的增加，膜的溶胀和断裂伸长率降低。FTIR显示，通过引入黄in苷，PVA分子之间的相互作用发生了显着变化。这些结果表明，掺入黄ical苷提取物的PVA膜可用于功能性保护膜的开发。随着拉伸强度和杨氏模量的增加，膜的溶胀和断裂伸长率降低。FTIR显示，通过引入黄in苷，PVA分子之间的相互作用发生了显着变化。这些结果表明，掺入黄ical苷提取物的PVA膜可用于功能性保护膜的开发。