کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5157182 | 1500589 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Complexation of κ-carrageenan with gelatin in the aqueous phase analysed by 1H NMR kinetics and relaxation
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کلمات کلیدی
κ-CarrageenanArginine (PubChem CID: 6322)Sodium alginate (PubChem CID: 6850754)Leucine (Pubchem CID: 6106)Lysine (Pubchem CID: 5962)Histidine (PubChem CID: 6274)Phenylalanine (PubChem CID: 6140)Deuterium oxide (PubChem CID: 24602)Alanine (PubChem CID: 5950)Glutamic acid (PubChem CID: 611)distilled water (PubChem CID: 962)Tyrosine (PubChem CID: 6057)Polyelectrolyte complexes - مجتمع های پلی الکترولیتیGelatin - ژلاتینChitosan (PubChem CID: 21896651) - کیتوزان (PubChem CID: 21896651)Glycine (PubChem CID: 750) - گلیسین (PubChem CID: 750)
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The 1H NMR spectroscopy is used to study the kinetics of gelation in the aqueous mixtures of κ-carrageenan with gelatin. The time dependence of NMR signals intensities shows that the kinetics of gel formation consists of classical 'fast' (rate constant k â 6 hâ1) and 'slow' (k â 1 hâ1) periods, corresponding to a coil â helix transition and subsequent aggregation of helices. Upon increase of the κ-carrageenan/gelatin (w/w) ratio Z the rate of the fast process slows down by a factor of 1.6-2.4. Further analysis was done by studying the dependence of spin-spin relaxation times of protons of gelatin on Z in the aqueous phase. A qualitative scheme describing hydrogel formation in the complex solution is given. It is hypothesized that at higher concentration of PECs the hydrogel structure network is stabilized by three types of nodes: triple helices of gelatin and intra-/inter-molecular double helices of κ-carrageenan.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 169, 1 August 2017, Pages 117-126
Journal: Carbohydrate Polymers - Volume 169, 1 August 2017, Pages 117-126
نویسندگان
Nicolay G. Voron'ko, Svetlana R. Derkach, Mikhail A. Vovk, Peter M. Tolstoy,