کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10600180 | 982080 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimal routine conditions for the determination of the degree of acetylation of chitosan by 1H-NMR
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Optimal routine conditions for the determination of the degree of acetylation of chitosan by 1H-NMR Optimal routine conditions for the determination of the degree of acetylation of chitosan by 1H-NMR](/preview/png/10600180.png)
چکیده انگلیسی
Chitosan applications and properties mostly depend on its degree of acetylation, so methods that allow its accurate determination are needed. 1H-NMR taken in 2% DCl solutions at 70 °C is usually employed for that purpose but suffers from long experimental times. Here, it is demonstrated that this time can be dramatically reduced more than six-fold by simply performing the 1H-NMR experiment at 27 °C (the standard NMR probe temperature) with 90° pulses. Routine conditions allowing DA determinations in less than 3.5 min of NMR time per sample are described.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 61, Issue 2, 4 August 2005, Pages 155-161
Journal: Carbohydrate Polymers - Volume 61, Issue 2, 4 August 2005, Pages 155-161
نویسندگان
Eduardo Fernandez-Megia, Ramón Novoa-Carballal, Emilio Quiñoá, Ricardo Riguera,