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Klorin A ve B Türevlerinin Farkli pH larda H2O2 , t-BuOOH ve NaOCI Oksidantlarina Kar§i Yapisal Kararliligi (Seri A)

Different pH, chlorine derivatives A and B H2O2, t-BuOOH and NaOCl Oksidantlarina Snow § i of structural stability (Series A)

Journal Name:

  • Çankaya University Journal of Arts and Sciences

Publication Year:

  • 2006

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
This study investigated the structural stability of pheophytine a and b, pheophorbide a and b, and chlorophylide a and b in an oxidant free medium at a pH level between 1.00-14.00, in the dark an at room temperature. This study also investigated the structural stability of pheophytine a and b, pheophorbide a and b, and chlorophylide a and b towards the oxidants H2O2, t-BuOOH, and NaOCl at a pH level between 8.00¬14.00, in the dark an at room temperature. It is observed that the examined chlorine complexes are instable in an acidic medium (pH<7.00) but stable in a basic medium (pH > 8.00). It was found that chlorine complexes under the same circumstances are more stable in H2O2 and t-BuOOH oxidants compared to the NaOCl oxidant. It was found that pheophytine a is more stable than the other molecules examined in all the oxidants, that pheophytine b is most stable in H2O2 and t-BuOOH oxidants, and that chlorophylide a is the most instable in the NaOCl oxidants. While pheophorbide a and b are more stable compared to pheophytine a, chlorophylide a and b are more stable compared to pheophorbide b.
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Abstract (Original Language): 
Bu çalışmada feofitin a ve b, feoforbid a ve b ve klorofîlid a ve b pH 1.00-14.00 aralığında oksidantsız ve pH 8.00-14.00 aralığında H2O2, t-BuOOH ve NaOCl oksidantlarına karşı karanlıkta, oda sıcaklığında yapısal kararlılıkları incelenmiştir. İncelenen klorin kompleksleri, asidik ortamda (pH<7.00) kararsız, bazik ortamda (pH>8.00) ise kararlı olduğu görülmektedir. Klorin komplekslerinin aynı koşullar altında, NaOCl oksidantına göre H2O2 ve t-BuOOH oksidantlarında daha kararlı olduğu bulunmuştur. Feofitin a bütün oksidantlarda incelenen diğer molekülerden daha kararlı olduğu, H2O2 ve t-BuOOH oksidantlarında feofitin b, NaOCl oksidantında ise klorofilid a'nın en kararsız olduğu görülmüştür. Feoforbid a ve b, feofitin a'ya göre kararsız olurken, klorofilid a ve b ve feoforbid b'ye göre daha kararlı olduğu bulunmuştur.
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