Voltammetric determination of cystine and cysteines development of the method and applications

dc.contributor.advisorNişli, Gürel
dc.contributor.authorŞahbaz, İlyas
dc.date.accessioned2024-08-19T19:37:13Z
dc.date.available2024-08-19T19:37:13Z
dc.date.issued1995
dc.departmentEge Üniversitesi, Fen Bilimleri Enstitüsüen_US
dc.descriptionBu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır. Yayınlanma izni olmayan tezlerin basılı kopyalarına Üniversite kütüphaneniz aracılığıyla (TÜBESS üzerinden) erişebilirsiniz.en_US
dc.description.abstractABSTRAKT Sistin ve sisteinin polarografik (Brdicka yöntemiyle) ve voltammetrik (Cu(II) ortamı ve boraks tamponunda (pH 9.20) GCE ile) davranışı incelenmiştir. Polarografik yöntemde en uygun koşullar saptandıktan sonra (5x1 0"4 M) Co(Il) ve amonyak tamponu (pH 9.30); serum ve tükrük ortamına, örnekler denature edilerek (NaOH-NaCl ile) uygulanmıştır. Serum için denatürasyon süresi 45, tükrük için 30 dakika bulunmuştur. Sistin ve sisteinin tayin aralığı 5xl0~7-l()-5 m arasında doğrusal bulunmuştur. Diyabetli ve sağlıklı örnekler incelenerek serumlarda; 100 mi için 6,05±0,04 mg diyabetli, 7,26±0,04 mg sağlıklı ve tükrüklerde ise 0,25±0,04 mg diyabetli, 0,55±0,05 mg sağlıklıda, sistein miktarları standart katma yöntemiyle bulunmuştur. GCE ile voltammetrik çalışmada ise en uygun ortam..,«*. ooraks tamponu (pH 9.20) ve Cu(II) *~10-6 M; ile sağlanmıştır. Sistin ve sistein katılmasında, Cu-komplekslerinin indirgenmesine ilişkin ~-0.60 ve -1.20 V'da (SCE'a karşı) gözlenen piklerden ilkinin sistein derişimi ile değişimi 5,30x10" ^-2x10"^ M arasında doğrusal bulunmuştur. Clen_US
dc.description.abstractABSTRACT In this study, the polarographic behaviour of cystine and cysteine in Brdicka medium and the voltammetric behaviour of these amino acids in the presence of Cu(II) ion at carbon electrodes (GCE, CPE) were investigated. For polarographic studies best results were obtained by working with 5xl0~4 M Co(II) solution in pH 9.30 ammonia buffer. This method was exploited for the determination of cysteine in blood serum and saliva samples of healthy and diabetic patients. The samples were denaturated in NaOH-NaCl medium prior to the determination step. The optimum denaturation times were found to be 30 and 45 min for saliva and serum samples respectively. The samples were then transferred into Brdicka medium and the polarograms were recorded. The calibration curve was found to be linear in 5x10"?- 10"^ M concentration range. The cysteine contents of 100 ml serum samples were determined to be 6.05±Q.0â mg for diabetic and 7.26±0.04 mg for healthy patients by using standard addition method. The results for the saliva samples were 0.25+0.0.4 mg for diabetics and 0.55±0.05 mg per 100 ml sample of healthy patients. On the other hand the voltammetric behaviour of Cu(II) ion at carbon electrodes in the presence of cysteine was also investigated. On addition of cystine and cysteine into ~lxl0~6 M Cu(II) solution in pH 9.20 borate buffer two reduction peaks at -0.60 V and 1.20 V vs.SCE were observed. The calibration curve obtained by using the first peak was linear in the concentration range of 5.30xlO-10-2xlO"8 M cysteine. IVen_US
dc.identifier.endpage64en_US
dc.identifier.startpage1en_US
dc.identifier.urihttps://hdl.handle.net/11454/84982
dc.identifier.yoktezid46871en_US
dc.language.isoenen_US
dc.publisherEge Üniversitesien_US
dc.relation.publicationcategoryTezen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectKimyaen_US
dc.subjectChemistryen_US
dc.subjectBoraksen_US
dc.subjectBoraxen_US
dc.subjectPolarografien_US
dc.subjectPolarographyen_US
dc.subjectSisteinen_US
dc.subjectCysteineen_US
dc.subjectSistinen_US
dc.subjectCystineen_US
dc.subjectVoltametrien_US
dc.subjectVoltammetryen_US
dc.titleVoltammetric determination of cystine and cysteines development of the method and applicationsen_US
dc.typeMaster Thesisen_US

Dosyalar