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South African Journal of Chemistry

versión On-line ISSN 1996-840X
versión impresa ISSN 0379-4350

S.Afr.j.chem. (Online) vol.64  Durban  2011

 

RESEARCH ARTICLE

 

DSC of milk fats from various animals with high levels of medium-chain, unsaturated and polyunsaturated fatty acids

 

 

Gernot OsthoffI, *; Arno HugoI; Chris C. JoubertII; Jannie C. SwartsII

IDepartment of Microbial, Biochemical and Food Biotechnology, University of the Free State, Bloemfontein, South Africa
IIDepartment of Chemistry, University of the Free State, Bloemfontein, South Africa

 

 


ABSTRACT

Mammals of different species provide milk lipids with a wide variety of fatty acid composition yet with common stereospecific features. This allows the investigation of crystallographic properties of milk lipids that cannot be achieved by interesterified lipids due to the random stereospecific distribution that is obtained. The milk fats of elephant and white rhinoceros contain high amounts of 8:0, 10:0 and 12:0 which form triglyceride species that melt between 8 and 22 °C. The crystallographic behaviour of the milk lipids from blesbok and blue wildebeest differ from the other ruminant lipids, and that of horse and vervet monkey differ from the other non-ruminant lipids. It seems that a low content of 18:0 and 18:1, and a high content of saturated short- to medium-length fatty acids prevent the formation of the high and low temperature melting isotherms, between 35 and 42 °C, and between -45 and -10 °C, respectively, which are normally observed for milk fats.

Keywords: Triglyceride, differential scanning calorimetry, milk, medium-chain fatty acid, polyunsaturated fatty acid


 

 

Full text available only in pdf format.

 

ACKNOWLEDGEMENTS

The authors acknowledge the contribution of Mrs Eileen Roodt for the lipid extractions, Mr Johan du Toit of Raakvat Jagklub, Bultfontein, for allowing our presence during culling operations to collect milk, Dr Maria Delclaux Real de Asua, Zoo-Aquarium de Madrid for gorilla and bottle nose dolphin milk (Cites permit no. 048958), Dr Sharon Redrobe, Bristol Zoo Gardens for pudu and okapi milks (Cites permit no. 048957) and Ms Petro de Wit, National Hospital, Bloemfontein for collecting human milk from an anonymous willing donor.

 

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Received 29 August 2011
Accepted 6 December 2011

 

 

Submitted by invitation to celebrate 2011 the 'International Year of Chemistry'.
* To whom correspondence should be addressed. E-mail: osthoffg@ufs.ac.za

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