کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
866558 1470980 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interference-free determination of ischemia-modified albumin using quantum dot coupled X-ray fluorescence spectroscopy
ترجمه فارسی عنوان
تعیین بی اختیاری آلبومین اصلاح شده با ایسکمی با استفاده از طیف سنجی فلورسانس اشعه ایکس با کوانتوم نقطه
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• A Q-XRF assay is proposed for IMA determination by calculating the difference between HSA and iHSA.
• Quantum dot-coupled sandwich immunoassay is developed to quantify HSA.
• Intact HSA (iHSA) is quantified by measuring XRF intensity of Co (II).
• XRF enables rapid and interference-free determination of IMA.

Ischemia-modified protein (IMA) is the most sensitive diagnostic biomarker of ischemic heart disease, but differentiation of IMA from human serum albumin (HSA), a ubiquitous serum protein, is still challenging owing to the shared antigenicity. In this investigation, we developed a rapid and interference-free approach for IMA determination using quantum dots-coupled X-ray Fluorescence Spectroscopy (Q-XRF). In a typical Q-XRF assay, serum total HSA is quantified using quantum dot-coupled sandwich immunoassay, and intact HSA (iHSA) is determined using a XRF spectroscopy, by measuring XRF intensity of Co (II) bonded to iHSA. IMA concentration is automatically determined within 30 min by calculating the difference between total HSA and iHSA. This strategy can effectively eliminate the interference from native HSA level. Results show that no significant influences have been observed from hemolysis or high levels of cholesterol (7 mg/L), triglyceride (5.2 mg/L), IgG (10 g/L), and fibrinogen (4 g/L). A linearity of 1–100 mg/mL is obtained in iHSA determination using XRF (r2=0.979). The proposed Q-XRF assay demonstrates a lowest detection limit of 0.05 U/mL. Receiver-operating characteristic (ROC) curves reveal that Q-XRF assay provide an improved sensitivity than ACB assay (95.9% vs. 82.9%) in differentiating ischemic patients from health individuals, at an optimal cutoff point of 79.2 U/mL. The proposed approach provides a new strategy for interference-free, simple and rapid evaluation of IMA concentration by combining sandwich immunoassay and XRF spectroscopy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biosensors and Bioelectronics - Volume 51, 15 January 2014, Pages 136–142
نویسندگان
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