The Effect Of The Pigment From Root Of Dioscorea Cirrhosa Lour On The Structure Of Gummed Canton Silk Proteins

Gummed Canton silk is a kind of traditional silk clothing material which is popular in Canton province. It is comfortable to wear especially in summer for its soft and smooth texture and moisture adsorption and release. Its unique fabric style and performance are mainly due to its special processing methods. The main raw materials of Gummed Canton silk were silk, pigment juice form root of Dioscorea Cirrhosa Lour and mud. The processing of Gummed Canton silk relies on traditional manual methods, and highly depends on the weather. So far, it can not be produced throgh industrialization proceduces since the production mechanism has still unclear. Therefore, this paper studied the influence of processing prodecues on the structure and property of Gummed Canton silk. In view of Fe3+ in the mud, which may react with the dyes from roots of Dioscorea Cirrhosa Lour and fabrics during the shaping of Gummed Canton silk, we made pigment blended films of silk fibroin, Fe Cl3 and tannin, then studied the structure and performance of the films. Finally, the influence of tannin on the structure of sericin sponge was studied.In this paper, the structure of Gummed Canton silk and the semi-finished fabric was firstly studied by using scanning electron microscopy（SEM）, X-ray diffractometer and FT-IR spectroscopy. The result showed that the crystallinity of the raw fabric did not change significantly during the fabric processing, except for the molecular conformation. The antioxidant property of the semi-finished fabric decreased upon the color fastness of the fabric improved. Other properties of Gummed Canton silk, such as moisture adsorption and release, antibacterial property were also studied. The moisture absordtion and release rate of Gummed Canton silk were higher than common silk. Gummed Canton silk showed excellent antibacterial property and it was durable to domestic washing.Silk fibroin, tannin and FeCl₃ were made to blend films. The film’s structure and thermal property were analyzed by using X-ray diffractometer, FT-IR spectroscopy, SEM, differential scanning calorimetry（DSC） and thermogravimetric analysis（TG）, and weight loss in hot water. The color of tannin-Fe Cl3-fibroin blend films caused by the reaction between tannin and Fe3+ appears black, which were close to the color of Gummed Canton silk. The addition of tannin and Fe3+ increased the crystallinity of silk fibroin film, which greatly reduced the weight lossrate of silk fibroin films in hot water. Addition of tannin and Fe3+ can destroy the original structure of silk fibroin, and the tannin-Fe3+ complex induces conformal transformation of the structure of partial silk fibroin from amorphism to crystallization.In order to study the interaction of tannin and sericin, tannin-sericin protein sponges containing of different concentrations of tanninwere made. Fluorescence quenching analysis, FT-IR spectroscopy, X-ray diffractometer, SEM, differential scanning calorimetry（DSC） and thermogravimetric analysis（TG） were used to analyse the influence of tannin on the structure and thermal property of sericin. The results showed that hydrophobic amino acid side groups of sericin molecular chain had interacted with tannin. Tannin-sericin sponge and pure sericin sponge were mainly random coil structure, but the crystallinity increased, and partly structure changed from random coil to β-sheet structure occurred when tannin were added. The structure became tighter when condensed tannin contents were less than 15%, but addition of higher condensed tannin content（20%, 30%） led tophase separation between tannin and sericin.In addition, tannin improved the structure of sericin material and the thermal stability of sericin.