کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1229679 1495234 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of trypsin–CdSe quantum dot interactions via spectroscopic methods and effects on enzymatic activity
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Investigation of trypsin–CdSe quantum dot interactions via spectroscopic methods and effects on enzymatic activity
چکیده انگلیسی


• Study of trypsin–CdSe quantum dots interactions.
• Fluorescence quenching suggests static mechanism resulting in trypsin–CdSe complex.
• α-Helix content of trypsin increases for trypsin–QD complex.
• Trypsin retained the enzymatic activity upon CdSe addition.
• Enzymatic activity of trypsin–CdSe is affected by temperature and pH.

The paper presents the interactions between trypsin and water soluble cadmium selenide (CdSe) quantum dots investigated by spectrophotometric methods. CdSe quantum dots have strong ability to quench the intrinsic fluorescence of trypsin by a static quenching mechanism. The quenching has been studied at three different temperatures where the results revealed that electrostatic interactions exist between CdSe quantum dots and trypsin and are responsible to stabilize the complex. The Scatchard plot from quenching revealed 1 binding site for quantum dots by trypsin, the same has been confirmed by making isothermal titrations of quantum dots against trypsin. The distance between donor and acceptor for trypsin–CdSe quantum dot complexes is calculated to be 2.8 nm by energy transfer mechanisms. The intrinsic fluorescence of CdSe quantum dots has also been enhanced by the trypsin, and is linear for concentration of trypsin ranging 1–80 μl. All the observations evidence the formation of trypsin–CdSe quantum dot conjugates, where trypsin retains the enzymatic activity which in turn is temperature and pH dependent.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 134, 5 January 2015, Pages 173–183
نویسندگان
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