Somogyi Múzeumok Közleményei 11. - A népvándorláskor fiatal kutatói 5. találkozójának előadásai (1995)

Csapó János - Csapó Jánosné - Költő László - Pap Ildikó - Sándor Némethy: Gyapjúszőnyegekkorának meghatározása a cisztin, ciszteinsav, a metionin és a tirozin tartalom alapján

258 CSAPÓ JÁNOS-CSAPÓ JÁNOSNÉ-KÖLTŐ LÁSZLÓ-PAP ILDIKÓ-SÁNDOR NÉMETHY AGE ESTIMATION OF OLD CARPETS BASED ON CYSTINE, CYSTEIC ACID, METHIONINE AND TYROSINE CONTENT Abstract A method for evaluation of age of wool carpets and textiles was developed based on the age dependent alteration of amino acid composition of proteins. Samples of 23 wool carpets and textiles of known age, obtained from the Hungarian Museum of Industrial Arts and the Hungarian National Museum were analysed for amino acid content. Results were compared with data obtained for contemporary, untreated wool and wool carpet. The cysteic acid content of wool increased with age. The contemporary wool

4 carpet contained 0.31 g of cysteic acid in 100 g of protein. Comparable figures were 1.87 g for 550year old carpet and 4.01-4.39 g for the 16001750-year old wool carpets. Cystine content decreased with age corresponding figures being 7.88, 3.12, 1.19-0.97, respectively. Corresponding contents of methionine were 0.43, 0.21, and 0.20-0 and for tyrosine were 3.07, 2.11 and 0.200. Prediction equations were developed as linear regressions "of age of wool on cysteic acid, cystine and tyrosine contents. The 95% confidence intervals of estimates for two samples of unknown age were estimates plus or minus 30 and 38 years. Keywords: Age estimation, cysteic acid, cystine, methionine, tyrosine, wool carpet, wool cloth. 1. táblázat. A magyar merino gyapjának aminosav összetétele különböző idejű hidrolízis után Aminosavak 24 Hidrolízis idő (óra) 48 72 96 120 Ciszteinsav 0.15 0.15 0.16 0.16 0.19 Aszparaginsav (Asp) 7.3 7.4 8.0 8.3 8.3 Treonin (Thr) 6.2 5.9 6.0 6.1 6.2 Szerin (Ser) 7.5 7.6 7.1 7.1 7.2 Glutaminsav (Glu) 11.3 12.7 15.0 15.4 15.5 Prolin (Pro) 6.0 6.5 6.6 6.9 7.2 Glicin (Gly) 4.9 4.6 4.6 5.0 4.8 Alanin (Ala) 4.5 4.5 4.4 4.9 4.4 Cisztin (Cys) 12.0 10.2 8.0 7.6 7.1 Valin (Val) 6.8 7.0 7.0 7.3 7.3 Metionin (Met) 0.4 0.5 0.4 0.3 0.4 Izoleucin (lie) 3.3 3.6 3.7 3.5 3.2 Leucin (Leu) 7.8 8.2 8.2 7.9 8.4 Tirozin (Tyr) 3.5 2.9 • 2.4 1.4 1.2 Fenilalanin (Phe) 4.2 4.2 4.0 4.0 4.1 Lizin (Lys) 3.5 3.2 3.2 3.3 3.5 Hisztidin (His) 0.8 0.8 0.8 0.8 0.8 Arginin (Arg) 7.7 7.7 7.8 7.8 8.1 Ammonia 2.3 2.4 2.2 2.2 2.3