Effect Of Pepsin And Trypsin Enzymes Used In Textile Conservation On Natural Dyedtextiles Samples.

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This paper discusses the pepsin and trypsin enzymes behavior towards natural fibers dyed with natural dyes. In this study four natural fibers were used: cotton, linen, wool, silk dyed with 14 of natural dyes extracted fromR.tinctoria L(madder), Humuluslupulus L(common hop), P.tormentillaneck (blood-root), A.cepa L(onion skin), Punicagranatum L(pomegranate skin), A.catechuwilld(catechu tree), Juniperuscommunis L(common juniper tree), R.coriaria L(dyer's sumac), Bongardiachyso- gonumboiss(golden rod), A.arabicawilld(Egyptian L(dog׳s fennel) and acacia),Bixaorellana L(annatto), S.officinalis L(common sage),A.cotula Dactylopiuscoccus (American cochineal). Alum was used as mordant to fixate dyes with fibers. The dyed samples were divided in three groups; the first group was treated with buffer solution to study the effect of buffer solution used with enzymes on the dye, the second group was treated with slight concentration of enzymes and the last group was treated with high concentration of enzymes to study the effect of enzymes concentration on natural dyes. Each treatment continues for four hours at 40C˚ with stirring the solution. The strength of color and color difference were measured for each sample to show the effect of treatment on dyes, it concluded that the pepsin and trypsin enzymes have not any side effects on dyed samples, the side effect back to the buffers solution.

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