کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
235132 465629 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cocoa powder surface composition during aging: A focus on fat
ترجمه فارسی عنوان
ترکیب سطح پودر کاکائو در هنگام پیری: تمرکز روی چربی
کلمات کلیدی
پودر کاکائو، ترکیب سطح، چربی کاکائو، ساختار ذرات، مهاجرت چربی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Two mechanisms happen on cocoa powder depending on storage temperature.
• Particle internal modifications occur whatever the storage temperature.
• Surface fat migration occurs only at elevated temperatures.
• Fat migration leads to surface fat patches, fat bridges between particles and caking.

The surface of 11 wt.% fat cocoa particles was thoroughly investigated during a 2-month storage at 20 and 40 °C and at aw = 0.2. Surface fat migration was evidenced only for powders stored at 40 °C by X-ray Photoelectron Spectroscopy. This was confirmed by ToF-SIMS, which allowed visualizing bigger fat patches at the surface of 40 °C-stored powders. These observations emphasize that fat need to be under a melted form to move toward the surface during storage. However, an increase in the free fat content was observed at both 20 °C and 40 °C. These results suggest rearrangements of particle structure during storage; free fat being more accessible to solvents at both temperatures. Confirmation was done by Scanning and Transmission Electron Microscopy images. Free and encapsulated fat were also extracted and analyzed during storage and no significant difference in fatty acids distribution (C16, C18, C18:1, C18:2) was observed by gas chromatography.

That two mechanisms may have occurred during storage: (1) Internal particle modifications due to aging whatever the storage temperature, and (2) fat melting at 40 °C inducing surface fat migration, leading to the formation of fat patches at the cocoa particle surface and fat bridges between particles and caking.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Powder Technology - Volume 292, May 2016, Pages 195–202
نویسندگان
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