کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
226157 464527 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
NMR imaging of continuous and intermittent drying of pasta
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
NMR imaging of continuous and intermittent drying of pasta
چکیده انگلیسی

An NMR imaging technique published in literature was adapted to investigate the role of glass transition on Fickian and non-Fickian modes of moisture transport in pasta. The modified technique allowed measuring the moisture distribution in samples with initial moisture content from 10% to 50% or higher. A change in slope in the signal intensity versus moisture content curves indicated different state or distribution of water in pasta samples below 16.9% moisture content for both 22 °C and 40 °C data. Sharp shape of moisture content profiles during continuous drying experiments indicated non-Fickian moisture transport near the glass transition regime. With progress of drying at 40 °C, the moisture profiles became more round, as pasta approached towards the glassy state, which indicated Fickian transport. A sharp change in pasta’s moisture content during drying near glass transition caused a wide contrast in pasta’s mechanical properties across its cross-section, which may make it prone to stress-cracking. During intermittent drying, a wet layer near the surface of pasta samples was clearly observed, which caused greater amount of moisture loss than during continuous drying.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Food Engineering - Volume 78, Issue 1, January 2007, Pages 61–68
نویسندگان
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