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Physical characterisation of drug encapsulated soybean oil nano-emulsions

Haidar, Iman and Harding, Ian H. and Bowater, Ian C. and McDowall, Alasdair W. (2020) Physical characterisation of drug encapsulated soybean oil nano-emulsions. Journal of Drug Delivery Science and Technology, 55 . Art. No. 101382. ISSN 1773-2247.

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Lecithin based soybean oil emulsions, similar to Intralipid®, were used to successfully encapsulate drugs having a range of hydrophobicity and acid-base characteristics. The drugs studied were phenanthrene, diazepam, histamine and chloroquine and these were compared with previous studies involving halofantrine. The drug encapsulated emulsions were tested for pH, stability, particle size, zeta potential and morphology (cryo electron microscopy). Encapsulation of any drug was found to decrease the stability of the emulsion, increase the particle size, decrease the (negative) zeta potential and in some cases, resulted in distortions to the particles. Specifically, close to the isoelectric point, gross distortions were observed involving large, elongated, worm like structures for the drugs halofantrine and histamine. The short term stability of all drug encapsulated emulsions were good, however all showed some signs of instability with time, probably due to a concomitant pH drift to low pH values, resulting in a decreased zeta potential and loss of stability. Neither hydrophobicity nor the acid-base nature of the encapsulated drug was found to have a strong influence on the stability, particle size or zeta potential profile of the emulsion.

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Additional Information:© 2019 Elsevier B.V. Received 7 August 2019, Revised 18 October 2019, Accepted 9 November 2019, Available online 11 November 2019. Chemical compounds studied in this article: Halofantrine CID: 37393; Phenanthrene CID: 995; Chloroquine CID: 2719; Histamine CID: 774; Diazepam CID: 3016. The authors would like to thank Dr W. Charman, Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, for project advice and access to equipment and consumables. The authors wish to declare there are no conflicts of interest.
Subject Keywords:Intralipid; Cryo EM; Particle deformation; Instability; Soybean emulsion; Isoelectric point; Zeta potential; Particle size
Record Number:CaltechAUTHORS:20191112-094855738
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Official Citation:Iman Haidar, Ian H. Harding, Ian C. Bowater, Alasdair W. McDowall, Physical characterisation of drug encapsulated soybean oil nano-emulsions, Journal of Drug Delivery Science and Technology, 2019, 101382, ISSN 1773-2247, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99800
Deposited By: Tony Diaz
Deposited On:12 Nov 2019 17:55
Last Modified:19 Nov 2019 18:46

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