Characterization of O/W Pickering emulsion by NMR

Name: Wiphada Mitbumrung

Address: 333 Moo1, Thasud, Muang, Chiang Rai 57100

Organization : School of Agro-Industry, Mae Fah Luang University

Email : ask.library@mfu.ac.th

Name: Shingo Matsukawa

Name: Surangna Jain

Name: Thunnalin Winuprasith

keyword: Emulsion - Nanofibrillated cellulose - Restricted diffusion - Pulsed-field-gradient nuclear magnetic resonance (PFG-NMR)

ThaSH: Food sciences

ThaSH: Agricultural industries

ThaSH: Emulsions

ThaSH: Cellulose

ThaSH: Cellulose nanocrystals

Abstract: Nuclear magnetic resonance (NMR) is defined as a non-invasive technique for measuring emulsion droplet size. The diffusion of oil molecules in oil-in-water (O/W) emulsions is restricted within oil droplet which directly affected by the oil droplet radius. Thus, restricted diffusion of oil molecules can be used to determine the oil droplet diameter. This research was aimed to investigate the influence of emulsifier type on emulsion droplet diameter by NMR comparing with conventional light scattering technique. The 10% wt oil O/W emulsions were prepared using nanofibrillated cellulose (NFC) or whey protein isolate (WPI) at concentration of 0.3, 0.5 and 0.7% wt as an emulsifier. Diffusion coefficients (D) were measured by pulsed-field-gradient stimulated spin-echo (PFG-STE) pulse sequence using High-field NMR. The results showed that the diffusion coefficients of the O/W emulsions were dependence on diffusion time (Δ). The increase in diffusion time found the decay of attenuation of a coherent magnetic signal. Since the diffusion of oil molecules was limited by adsorbing of NFC at oil-water interfaces, the restricted diffusion was found in NFC-stabilized emulsions by observing constantly of mean square displacement (Z2) when the diffusion time was increased. On the other hand, free diffusion was found in WPI-stabilized emulsions which may occur from the diffusion of oil molecules within oil droplet and the movement of oil droplet itself. The droplet size determined by NMR technique showed the results in the same agreement with the light scattering technique. Hence, the restricted diffusion measurement by PFG-NMR is a novel and an alternative technique for monitoring emulsion droplet size. However, it is more suitable for emulsions with slow movement of oil droplets or emulsions with high viscosity of continuous phase.

Mae Fah Luang University. Learning Resources and Educational Media Center

Address: CHIANG RAI

Email: library@mfu.ac.th

Modified: 2021-10-12

Issued: 2021-10-12

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Journal of Food Science and Agricultural Technology (2019) Vol.5 (Spcl. Iss.): 89-93

eng

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