کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
69384 48761 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enzymatic proteolysis of peptide bonds by a metallo-endoproteinase under precise temperature control with 5.8-GHz microwave radiation
ترجمه فارسی عنوان
پروتئولوز آنزیمی پیوند های پپتیدی توسط یک فلز آنتروپتیدیناز تحت کنترل دمای دقیق با اشعه مایکروویو 5.8 گیگاهرتز
کلمات کلیدی
اثرات غیر گرمایی مایکروویو، میدان مغناطیسی، پروتئولیز، پروتئین، فعالیت آنزیم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• The 5.8-GHz microwave device which can perform precise thermal management was proposed.
• Microwave non-thermal effects were examined in Asp-N enzymatic reaction.
• The promoted enzymatic reaction was shown by a microwave magnetic field.

The present article examined the advantages of 5.8-GHz microwaves versus the more commonly used 2.45-GHz microwaves using a modular non-commercial apparatus on the proteolysis of the Arg-Arg-Leu-Ile-Glu-Asp-Ala-Glu-Tyr-Ala-Ala-Arg-Gly peptide at the amino side of the aspartic acid (Asp) using the Asp-N metallo-endoproteinase enzyme. The microscale sample was subjected to microwaves’ electric field (E-field) and magnetic field (H-field) radiation; good temperature control for samples at the μL scale was achieved using an apparatus that emitted microwaves at a precise frequency (5.800000 GHz). Temperature-dependent experiments with the Asp-N metallo-enzyme confirmed the activity of this enzyme to be greatest at 37 °C reached within 15 s on irradiation with the 5.8-GHz microwaves’ H-field component with an input power of 1.7 W under air cooling conditions. Enzymatic activity decreased significantly above and below this temperature by a slight temperature change of 1 °C. Proteolysis yields of the peptide by the Asp-N enzyme at 30–42 °C under microwave E-field and H-field heating and under conventional heating revealed that enhancement of the proteolysis of the peptide at 37 °C by E-field irradiation (42.6%) was 1.5 times greater than by conventional heating (27.5%), whereas under microwave H-field irradiation (63.5%) it was 2.3 times greater than conventional heating. The relative dielectric loss factors (ɛr″) of the sample solution (peptide + enzyme) were also determined: 22.19 (5.8 GHz) and 12.78 (2.45 GHz) at 22 °C, which decreased with increasing temperature (faster for the 5.8-GHz microwaves) so that the initial heating efficiency of 5.8-GHz microwaves was nearly twofold greater than for 2.45-GHz microwaves. Results indicated that in addition to a thermal factor, microwave non-thermal factors also had a significant influence as the microwaves considerably enhanced the proteolytic process relative to traditional heating.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis B: Enzymatic - Volume 116, June 2015, Pages 52–59
نویسندگان
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