The Synthesized Exploitation Of Silkworm Pupa And The Study On The Uv-Induced Surface Modification Of PBT Nonwovens For Blood Filtration With Oleic Acid

Silkworm pupa is one of the most important byproducts of China's textile industry. With the rapid development of this promising industry, the synthesized exploitation of silkworm resources is becoming more and more popular. The main compositions of silkworm pupa are protein, oil and chitin, etc. all of which possess good healthcare, medical and pharmaceutical values. In this article, we mainly study the extraction methods, procedure and the analysis of these three main compositions and discuss some of the factors that affect the efficiency of the extraction procedure.The organic solvent extraction was used to gain silkworm oil from silkworm pupa which is mainly made up of fatty acid glycerides in which the unsaturated fatty acid glycerides account for the most percentage. The GC-MS was used to characterize the hydrolyzed silkworm oil qualitatively and quantitatively and the results showed that the unsaturated fatty acids account for 70% of the total, the fatty acid 30%. Oleic acid, linoleic acid andlinolenic acid are the main unsaturated fatty acids of hydrolyzed silkworm oil which are all the necessary long chain unsaturated fatty acids of human being with the same length of carbon chain and different unsaturated degrees. The urea inclusion was used to further enrich the unsaturated fatty acids in hydrolyzed silkworm oil.After the extraction of silkworm oil, the remaining part of silkworm pupa is mainly made up of protein and chitin. The alkaline solution was used to dissolve the protein molecules and after adjusting the pH value of the solution, the protein can precipitate from the solution. The scentless protein powder can be gained after whiten and dryness procedures. The powder can be used as food, feeding stuff or further hydrolyzed to produce mixed amino acids. After the extraction of protein, the acid and alkaline solutions were used to remove the remaining protein and non-organic minerals to produce chitin.On the basis of the extraction experiment, we finally summed up the extraction procedures and came up with the synthesized exploitation procedure of silkworm pupa. The application values of the synthesized exploitation of silkworm pupa were discussed.Oleic acid is one of the main unsaturated fatty acids of hydrolyzed silkworm oil (above 30%). We explored the possible application of oleic acid for the surface modification of hydrophobic polybutylene terephthalate (PBT) used for blood filtration. Oleic Acid was grafted on the surface of PBT nonwoven fabric through the free radical polymerization which was initiated by ultraviolet radiation and BP (benzophenone). The modification conditions and the influenced factors such as the grafting time, the concentration of the initiator are investigated. Fourier transforms infrared spectroscopy (FT-IR),scanning electron microscope (SEM) and contact angle measurements were used to characterize the modified surface of the PBT fabrics. The results proved that the graft reaction was successful and the grafted oleic acid was able to greatly improve the hydrophilic and filtration performance of the PBT blood filtration material. The treated PBT nonwovens maintain the good compatibility and meet the requirement of the clinical application.