|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|147220||2017||43 صفحه PDF||سفارش دهید|
نسخه انگلیسی مقاله همین الان قابل دانلود است.
هزینه ترجمه مقاله بر اساس تعداد کلمات مقاله انگلیسی محاسبه می شود.
این مقاله تقریباً شامل 9970 کلمه می باشد.
هزینه ترجمه مقاله توسط مترجمان با تجربه، طبق جدول زیر محاسبه می شود:
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : International Journal of Food Microbiology, Volume 260, 2 November 2017, Pages 65-74
In this study, the effects of Ultraviolet light-emitting diodes (UV-LEDs) on the inactivation of E. coli K12 (ATCC 25253), an indicator organism of E. coli O157:H7, and polyphneoloxidase (PPO) in cloudy apple juice (CAJ) were investigated. The clear (AJ) and cloudy apple juice were exposed to UV rays for 40Â min by using a UV device composed of four UV-LEDs with peak emissions at 254 and 280Â nm and coupled emissions as follows: 254/365, 254/405, 280/365, 280/405 and 254/280/365/405Â nm. UV-LEDs at 254Â nm achieved 1.6Â Â±Â 0.1 log10 CFU/mL inactivation of E. coli K12 at UV dose of 707.2Â mJ/cm2. The highest inactivation of E. coli K12 (2.0Â Â±Â 0.1Â log10 CFU/mL and 2.0Â Â±Â 0.4Â log10Â CFU/mL) was achieved when the cloudy apple juice was treated with both 280Â nm and 280/365Â nm UV-LEDs. For clear apple juice the highest inactivation 4.4Â log10Â CFU/mL obtained for E. coli K12 was achieved using 4 lamps emitting light at 280Â nm for 40Â min exposure time. For the same treatment time, the experiments using a combination of lamps emitting light at 280 and 365Â nm (2lamp/2lamp) were resulted in 3.9Â Â±Â 0.2Â log10Â CFU/mL reductions. UV-A and UV-C rays in combination showed a better inactivation effect on PPO than UV-C rays used separately. Residual activity of PPO in CAJ was reduced to 32.58% when treated with UV-LED in combination of UV-C (280Â nm) and UV-A (365Â nm) rays. Additionally, the total color change (ÎE) of CAJ subjected to combined UV-LED irradiation at 280/365Â nm was the lowest compared to other studied processing conditions. This study provides key implications for the future application of UV-LEDs to fruit juice pasteurization.