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Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Processing and storage of ratite oils affects primary oxidation status and radical scavenging ability

Suzanne Mashtoub A B C , Darin C. Bennett C D , Cuong D. Tran B E and Gordon S. Howarth B F G
+ Author Affiliations
- Author Affiliations

A School of Medicine and Pharmacology, University of Western Australia, Fremantle Hospital, Fremantle, WA 6160, Australia.

B Department of Gastroenterology, Women’s and Children’s Hospital, North Adelaide, SA 5006, Australia.

C Avian Research Centre, Faculty of Land and Food Systems, University of British Columbia, British Columbia V6T 1Z4, Canada.

D Animal Science Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA.

E Animal, Food and Health Sciences, Commonwealth Scientific and Industrial Research Organisation, Adelaide, SA 5000, Australia.

F School of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, SA 5371, Australia.

G Corresponding author. Email: gordon.howarth@adelaide.edu.au

Animal Production Science 55(10) 1332-1337 https://doi.org/10.1071/AN13556
Submitted: 28 December 2013  Accepted: 7 August 2014   Published: 28 October 2014

Abstract

Treatments for diseases such as coronary artery disease and gastrointestinal disorders seek to minimise oxidative damage by free radicals through the use of antioxidants. Oils derived from ratites (flightless birds) have therapeutic potential, with varying fatty acid composition between species. The current study investigated the influence of farm location, rendering method, duration and storage mode on radical scavenging activity (RSA) and primary oxidation status of ratite oils. Emu Oil (n = 8; EO1, EO2a/b, EO3–7; varying processing and storage factors), Ostrich Oil (OsO), Rhea Oil (RO) and olive oil (OlO) were tested for free RSA against 2,2-diphenyl-1-picryl hydracyl (expressed as 1/IC50 g/mL) and primary oxidation (peroxide mEqO2/kg). RSA (g/mL) of EO1 (558 ± 22) was greater than EO2a (8 ± 0.6), EO5 (413 ± 26), EO6 (16 ± 0.3) and EO7 (2 ± 0.2), OsO (313 ± 12), RO (32 ± 12) and OlO (196 ± 4), and less than EO3 (717 ± 32; P < 0.001). Antioxidant properties of OsO were more pronounced than RO (P < 0.001). Primary oxidation (mEqO2/kg) of EO1 (97 ± 0.6) was greater than EO2a (57 ± 0.6), EO2b (28 ± 0.2), EO5 (11 ± 0.6), OsO (50 ± 0.9) and OlO (61 ± 0.9). The wide variability in RSA of oils highlights the need for standardisation of farm location, diet composition, rendering procedures, time of render and duration of storage. Regulatory control of these parameters is recommended in order to minimise differences in therapeutic efficacy of ratite oils.

Additional keyword: Emu Oil.


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