کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5521928 1401283 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Time domain nuclear magnetic resonance to monitor mass transfer mechanisms in apple tissue promoted by osmotic dehydration combined with pulsed electric fields
ترجمه فارسی عنوان
دامنه زمان ریزنموس مغناطیسی هسته ای برای نظارت بر مکانیزم انتقال توده در بافت سیب، به وسیله کاهش آب و هوای اسمتی همراه با میدان های الکتریکی پالسی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی


- Water loss and solid gain were significantly affected by PEF pre-treatment.
- TD-NMR with a contrast agent eased the observation of electroporation effects.
- Field strengths higher than 150 V cm− 1 caused the loss of compartmentalization.
- Water was redistributed from vacuole toward extracellular space at 100 V cm− 1.
- Dw and the longest T2 could be used to control OD and PEF effects, respectively.

Pulsed electric field (PEF) technology is gaining momentum as a pre-treatment to enhance mass transfer of vegetable tissues obtained by further processing. In this study PEF pre-treatment increased osmotic dehydration (OD) effectiveness, in terms of water loss and solid gain in apples, as a function of electric field strength and number of pulses. Mass transfer was particularly high when average electric fields of 250 and 400 V cm-1 were applied. Time domain nuclear magnetic resonance (TD-NMR), with the use of a contrast agent, clarified structural changes that drive mass transfer. Treatments at 100 V cm-1 redistributed water between vacuole, cytoplasm and extracellular space, while at 250 and 400 V cm-1 the membrane breakages caused the loss of cellular compartmentalization. Two non-destructive and fast acquirable parameters, the longest measured relaxation time (T2) and water self diffusion coefficient (Dw), allowed the separate and accurate observation of PEF treatment and osmotic dehydration effects.Industrial relevanceThe developed non-destructive method, here described, allows the measure of the effects of PEF treatment on apple tissue which can be exploited to have reliable control of the process within minutes. Since mass transfer parameters depend on subcellular water redistribution, the present work provides a tool to boost the development and optimization of agri-food processes on fresh vegetable tissues.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Innovative Food Science & Emerging Technologies - Volume 37, Part C, October 2016, Pages 345-351
نویسندگان
, , , , , ,