2.1 UNIVERSITY

B.SC., B.SC.(HONS), M.SC., D.SC. POTCHEFSTROOM UNIVERSITY FOR CHE (Northwest University)

B.Med.Sc.(Hons)(Pharmacology), Post Graduate Teachers Diploma. University of the Orange Free State

2.2 POST UNIVERSITY POST-DOCTORAL RESEARCH

Department of Biochemistry, Bowman Gray School of Medicine, Wake Forest University, Winston Salem, North Carolina, USA. 1989-1990

RECENT PUBLICATION OF WORK (Out of total =78)

• 1A du Toit, M de Wit, G Osthoff, A Hugo (2015) Antioxidant content and capacity of fruit from different colour cactus pear (O. ficus-indica and O. robusta) cultivars. Acta Horticulturae 1067, 187-192.
• 2M. Madende, G Osthoff, H.G. Patterton, H.E. Patterton, P. Martin, D. Oppermann (2015). Characterization of casein and alpha lactalbumin of African elephant (Loxodonta africana) milk. J. Dairy Sci. 98, 8308-8318 (Imp 2.45)
• 3G. Osthoff, A. Hugo, M. Madende, F. Deacon and P.J. Nel (2017) Milk composition of free-ranging red hartebeest, giraffe, reedbuck and warthog and a phylogenetic comparison of the milk of African Artiodactyla. Comp. Biochem. Physiol. A. 204, 93-103 (Imp. 1.56)
• 4Huchzermeyer K.D.A., Woodborne S., Osthoff G., Hugo, A., Steyl, J.C.A., Myburgh J.G. (2017) Pansteatitis in polluted Olifants River impoundments: Nutritional perspectives on fish suffering from pansteatitis from Lake Loskop, South Africa. J. Fish Diseases 40, 1665 – 1680 (Imp 2.00)
• 5Dabrowski J., Oberholster P.P, Steyl, J., Osthoff G., Hugo, A., Power, D.M., Van Wyk, J. H.(2017) Thyroid function of steatitis-affected Mozambique tilapia Oreochromis mossambicus from a sub-tropical African reservoir. Diseases of Aquatic Organisms 125: 101–113 (Imp 1.752)
• 6Du Toit, A., De Wit, M., Osthoff, G., Hugo, A. (2018) Relationship and correlation between antioxidant content and capacity, processing method and fruit colour of cactus pear fruit. Food and Bioprocess Technology, 11, 1527-1535. (Imp 2.998)
• 7M Madende, G Osthoff, G Kemp, S Stoychev(2018) Characterization of African elephant beta casein and its relevance to the chemistry of caseins and casein micelles. International Dairy Journal, 85, 112-120. (Imp 2.201)
• 8Du Toit, A., De Wit, M., Osthoff, G., Hugo, A. (2018) Antioxidant properties of fresh and processed cactus pear cladodes from selected Opuntia ficus-indica and O. robusta cultivars. South African Journal of Botany 118, 44-51. (Imp 1.442)
• 9Sajjad Akhtar, Gernot Osthoff, Kingstone Mashingaidze and Maryke Labuschagne (2018) Iron and Zinc in Maize in the Developing World: Deficiency, Availability, and Breeding. Crop Science, 58 No. 6, 2200-2213doi:10.2135/cropsci2018.02.0133
• 10De Wit, M., Du Toit, A., Osthoff, G., Hugo, A. (2019) Cactus pear antioxidants: a comparison between fruit pulp, fruit peel, fruit seeds and cladodes of eight different cactus pear cultivars (Opuntia ficus-indica and Opuntia robusta) Journal of Food Measurement and Characterization 1-10 doi.org/10.1007/s11694-019-00154-z
• 11Madende M, OsthoffG (2019) Comparative genomics of casein genes. Journal of Dairy Research 86: 323-330 (Imp 1.17)
• 12Kobeni S, Osthoff G, Madende M, Hugo A, Marabini L (2020) The dynamic changes of African elephant milk composition over lactation. Animals 10, 948, 1-18. doi:10.3390/ani10060948
• 13Arita-Merino N, Yener S, Van Valenberg HJF, Hugo A, Osthoff G. (2020) Varying levels of medium-chain fatty acids affect triacylglycerol composition and crystallization behavior of African elephant milk fat. Eur. J. Lipid Sci. 122, 1-11. doi.org/10.1002/ejlt.202000119

   

• 14Osthoff, G, Madende, M, Hugo, A, Butler, HJB (2020) Milk evolution with emphasis on the Atlantogenata. African Zoology 55, 257-266.
• 15Osthoff, G, Hugo, A, Madende, M, Schmidt, L, Kobeni, S, Deacon, F. (2021) Impala tsessebe milk Animals 2021, 11, 516.
• 16G. Osthoff, Beukes, B, Steyn, AC, Hugo,A, Deacon, F, Butler, HJB, O’Neill, FH, Grobler, JP (2021) Milk composition of white rhinoceros over lactation and comparison with other Perissodactyla. Zoo Biology 2021; 1-12. doi.org/10.1002/zoo.21618
• 17Sigwela, V., DeWit, M., du Toit, A., Osthoff, G., Hugo, A. (2021). Bioactive betalain extracts from cactus pear fruit pulp, beetroot tubers, and amaranth leaves. Molecules 26: 5012.
• 18Akhtar S., Labuschagne M., Osthoff G., Mashingaidze K., Hossain A. 2021. Xenia and deficit nitrogen influence the iron and zinc concentration in the grains of hybrid maize. Agronomy 11: 1388
• 19Olckers S-L, Osthoff G, Ng PKW, Van Biljon A, Labuschagne M. (2022) The impact of low nitrogen conditions on the chemical composition and flour pasting properties of quality protein maize. Cereal Res. Commun. Doi.org/10.1007/s42976-022-00253-6
• 20Olckers S-L, Osthoff G, Guzman Garcia C,Wentzel B, Van Biljon A, Labuschagne M.(2022) Drought and heat stress effects on gluten protein composition and its relation to bread-making quality in wheat. J Cereal Sci. 108, doi.org/10.1016/j.jcs.2022.103562

Biochemistry and Food Chemistry 

Research

• Exploitation of new and underutilized crops and wild indigenous vegetables as food sources.
• Investigation of the effect of agricultural practice on food quality of crops.
• Milk chemistry and evolution. A comparative study of the milk of non-dairy animals
   

Biochemistry and Food Chemistry 

Areas of interest

• Enzymes of psychrotrophic bacteria: The heat stable proteolytic enzymes of flavobacteria of dairy origin are being investigated. Enzymes are purified and their effect on the hydrolysis of the proteins in milk and dairy products investigated, with emphasis on sensory characters.
• Chemical and sensory development in foods: The chemical consistency and its relationship with sensory properties of foods, i.e. South African cheddar cheese and dried sausage, are investigated, with emphasis on the role of protein breakdown.
• Improvement of the nutritious quality of dairy products and dairy processes by alternative biological and technological methodologies.
• Improvement of the cost effectiveness of dairy processes by alternative biological and technological methodologies.
• Investigation of the effect of agricultural practice on food quality of crops.
• Milk chemistry and evolution. A comparative study of the milk of non-dairy animals
   

FSCP3712 Plant products

FSCP4814 Plant products

BOCE3714 Enzymology and Metabolism

• VALUE-ADDING TO AGRICULTURAL FOOD PRODUCTS