کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1266776 972300 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sonochemical effects on free phenolic acids under ultrasound treatment in a model system
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Sonochemical effects on free phenolic acids under ultrasound treatment in a model system
چکیده انگلیسی

Sonochemical effects on seven free phenolic acids under ultrasound treatment in a model system have been investigated. The degradation products have also been tentatively identified by FTIR and HPLC-UV-ESIMS. Five phenolic acids (protocatechuic acid, p-hydroxybenzoic acid, vanillic acid, p-coumaric acid, and ferulic acid) proved to be stable, while two others (caffeic acid and sinapic acid) were degraded under ultrasound treatment. The nature of the solvent and the temperature has been identified as important factors in determining the degradation reaction. Liquid height, ultrasonic intensity, and duty cycle of the ultrasound exposure affected only the degradation rate and did not change the nature of the degradation. The degradation rates of caffeic acid and sinapic acid decreased with increasing temperature. The degradation kinetics of these two acids under ultrasound conformed to zeroth-order reactions at −5 to 25 °C. Both decomposition and polymerization reactions occurred when caffeic acid and sinapic acid were subjected to ultrasound. Degradation products, such as the corresponding decarboxylation products and their dimers, have been tentatively identified.


► The effects of factors of free phenolic acids degradation under ultrasound treatment were investigated.
► Degradation kinetics of free phenolic acids under ultrasound treatment were developed.
► The compounds of degradation were also tentatively identified by FT-IR and HPLC-UV-ESIMS.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 20, Issue 4, July 2013, Pages 1017–1025
نویسندگان
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