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Titolo:
Fat emulsification measured using NMR transverse relaxation
Autore:
Marciani, L; Ramanathan, C; Tyler, DJ; Young, P; Manoj, P; Wickham, M; Fillery-Travis, A; Spiller, RC; Gowland, PA;
Indirizzi:
Univ Nottingham, Sch Phys & Astron, Magnet Resonance Ctr, Nottingham NG7 2RD, England Univ Nottingham Nottingham England NG7 2RD , Nottingham NG7 2RD, England AFRC, Inst Food Res, Norwich NR4 7UA, Norfolk, England AFRC Norwich Norfolk England NR4 7UA s, Norwich NR4 7UA, Norfolk, England Univ Nottingham Hosp, Queens Med Ctr, Nottingham NG7 2UH, England Univ Nottingham Hosp Nottingham England NG7 2UH tingham NG7 2UH, England
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 1, volume: 153, anno: 2001,
pagine: 1 - 6
SICI:
1090-7807(200111)153:1<1:FEMUNT>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
DROPLET SIZE DISTRIBUTIONS; IN-WATER EMULSIONS; SPIN RELAXATION; PFG-NMR; SUSCEPTIBILITY; DIFFUSION; SYSTEMS; TISSUES;
Keywords:
relaxation rate; susceptibility; olive oil; emulsion; droplet size;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Gowland, PA Univ Nottingham, Sch Phys & Astron, Magnet Resonance Ctr, Nottingham NG7 2RD, England Univ Nottingham Nottingham England NG7 2RD NG7 2RD, England
Citazione:
L. Marciani et al., "Fat emulsification measured using NMR transverse relaxation", J MAGN RES, 153(1), 2001, pp. 1-6

Abstract

This paper presents a novel method of measuring the droplet size in oil-in-water emulsions. It is based on changes in the NMR transverse relaxation rate due to the effect of microscopic magnetic susceptibility differences between fat droplets and the surrounding water. The longitudinal and transverse relaxation rates of a series of emulsions with constant oil volume fraction and five different mean droplet sizes, in the range 0.4-20.9 mum, were measured in vitro at 37 degreesC using EPI. While the longitudinal relaxation rate 1/T-1 did not change significantly, 1/T-2 was observed to increase with mean droplet size. The measured changes in 1/T-2 were found to be in good agreement with results predicted from proton random walk simulations, and were also consistent with analytical solutions based on an outer sphere relaxation model. Measurements of 1/T-2 on emulsions with a higher oil volume fraction, and on emulsions of a fixed size where the water phase was doped with gadolinium to modulate the susceptibility difference between the phases, also showed the predicted behavior. As part of this study the susceptibility difference between olive oil and water was measure toe 1.55 ppm. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 18:03:48