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Quantitation by magnetic resonance imaging of heating of commercial baby foods in glass jars
Author(s) -
Gao Amin Maryam H.,
Nott Kevin P.,
Hall Laurance D.
Publication year - 2007
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2006.01358.x
Subject(s) - microwave heating , microwave , microwave oven , materials science , thermal , physics , quantum mechanics , meteorology
Summary This study demonstrates how magnetic resonance imaging can be used to quantitate the heating of commercially available baby foods as sold in glass jars either ‘on‐line’ during immersion in warmed water in the scanner's magnet, or ‘off‐line’ following microwave heating. The internal temperature distribution can be measured in 2‐ or 3‐dimensions with a precision of ±1.5 °C compared with fibre optical thermo‐probe measurements. Illustrative examples include jars of Heinz ‘Banana & Apple’, Sainsbury's ‘Organic Banana Rice Pudding’ and Cow & Gate ‘Organic Roasted Vegetable Lasagne’. Localised thermal lags induced by pieces of vegetable in the lasagne were observed during on‐line immersion heating. Importantly, the spatially heterogeneous heating by microwaves demonstrates the need for strong warnings about using microwave ovens for heating baby foods.