مقدار پلی فنول در شراب سفید بر روی یک تجزیه کننده تزریق جریان میکرو فلوئیدیک با فیبرهای نوری جاسازی شده
|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|147806||2017||32 صفحه PDF||سفارش دهید|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Food Chemistry, Volume 221, 15 April 2017, Pages 1062-1068
Absorbance detection in food microdevices has not been thoroughly used due to low levels of sensitivity in measurements. Thus, it is necessary to develop microfluidic methods for improving photometric detection. For this purpose, a simple coupled-optical-fiber-polydimethylsiloxane (PDMS) microdevice was developed, to quantify polyphenols content in white wine employing the Folin-Ciocalteu reaction method. A 6Â V and 10Â W halogen lamp with an optical path length of 7Â mm between optical fibers, which were placed into the microchip, using guides at the outlet of the flow, increased the level of sensitivity during detection. The linear range was from 0.03Â mmol/L to 0.18Â mmol/L. Thus, the corresponding equation was: AbsÂ =Â 4.00(Â Â±Â 0.16) [tannic acid]Â +Â 0.17(Â Â±Â 0.017). Intra-laboratory repeatability and reproducibility percentages were 2.95% and 6.84%, respectively. Such results were compared to those obtained from applying the conventional flow-injection analysis method, based on the same type of reaction. The relative error between methods was less than 13%.