TY - JOUR T1 - Preparation of Dextran Cryogels and Some of Their Applications TT - Dekstran Kriyojellerinin Hazırlanması ve Bunların Bazı Uygulamaları AU - Sahiner, Nurettin AU - Ari, Betül PY - 2019 DA - December Y2 - 2019 DO - 10.28979/comufbed.644327 JF - Çanakkale Onsekiz Mart Üniversitesi Fen Bilimleri Enstitüsü Dergisi PB - Çanakkale Onsekiz Mart University WT - DergiPark SN - 2459-1580 SP - 187 EP - 200 VL - 5 IS - 2 LA - en AB - Inthis study, dextran (DEX) cryogels were prepared using 50% divinyl sulfone(DVS) crosslinker based on the repeating unit of DEX, under cryogenicconditions via cryogellation technique. It was shown that DEX cryogels can beused as column fillers to remove toxic substances such as organic dye,methylene blue (MB), pesticide, and paraquat (PQ) which are harmful to theenvironment and human health. The maximum absorption capacity of 15 mg DEXcryogels was determined as 10.69±0.14 mg/g using 5 mL of 100 ppm MB dye inabout seven minutes, and as 2.87±0.33 mg/g from 5 mL of 40 ppm PQ pesticide inabout ten minutes. The reusability of DEX cryogel for MB was also examined. Inthe consecutive use of DEX cryogel weighing ~30 mg, initially cryogel absorbed6.43±0.15 mg MB/g cryogel from 20 ppm 30 mL MB dye, but this value decreased to4.71±0.48 mg MB/g cryogel after the fifth use. The same cryogel released thesame amount of MB dye after the first use of 3.78±0.33 mg MB/g cryogel, butafter the fifth use the release amount decreased to 0.92±0.38 mg MB/g cryogelupon treatment with 1 M 30 mL HCl solution. The adsorption kinetics of DEXcryogel for MB were also examined and the Langmuir isotherm model with acorrelation coefficient of 0.9983 and the KLvalue of 0.36, representing the best fit amongstthe other well-known models such as theFreundlich isotherm, Temkin,Elovich and Dubinin-Radushkevich. KW - dextran cryogel KW - dye and pesticide removal KW - natural polymer KW - superporous/macro porous material N2 - Buçalışmada, dekstran (DEX) kriyojeleri, tekrarlayan DEX birimine göre %50divinil sülfon (DVS) çapraz bağlayıcı kullanılarak kriyojenik koşullar altındakriyojelasyon tekniği ile hazırlanmıştır. DEXkriyojellerinin çevreye ve insan sağlığına zararlı organik boya, metilen mavisi(MB), pestisit, parakuat (PQ) gibi toksik maddeleri uzaklaştırmak için kolondolgu maddesi olarak kullanılabileceği gösterilmiştir. DEX kriyojelinin 15 mg’ıiçin maksimum absorpsiyon kapasitesine, MB için yaklaşık yedi dakikada 5 mL-100ppm çözeltiden 10,69±0,14 mg/g, PQ için ise yaklaşık on dakikada 2,87±0,33 mg/gabsorblayarak ulaşmıştır. DEXkriyojelinin MB için yeniden kullanılabilirliği de yapılmıştır. ~30 mgağırlığındaki DEX kriyojelinin art arda kullanımında, başlangıçta 20 ppm, 30 mLolan MB çözeltisinden absorplanan miktar 6,43±0,15 mg MB/g kriyojel olarakhesaplanmış, bu değer beşinci kullanımdan sonra 4,71±0,48 mg MB/g kriyojelolarak hesaplanmıştır. MB absorplamış DEX kriyojeli ile yapılan salımçalışmalarında ilk kullanımda 3,78±0,33 mg MB/g kriyojel salmıştır, ancakbeşinci kullanımdan sonra, salınan miktar, 1 M 30 mL HC1 ile muamele üzerine0,92±0,38 mg MB/g kriyojel olarak hesaplanmıştır. DEX kriyojelinin MB içinadsorpsiyon kinetiği de incelenmiş olunup, 0,9983 korelasyon katsayısı ve 0,36KL değeri ile Freundlich, Temkin, Elovich ve Dubinin-Radushkevichizotermleri gibi diğer iyi bilinen modeller arasında en uygun olan Langmuirizoterm modelini temsil ettiği belirlenmiştir CR - Akilbekova D., Shaimerdenova, Adilov S., Berillo D., 2018. Biocompatible scaffolds based on natural polymers for regenerative medicine. 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UR - https://doi.org/10.28979/comufbed.644327 L1 - https://dergipark.org.tr/en/download/article-file/881004 ER -