The Chemical Composition of Oils and Cakes of _Ochna serrulata_ (Ochnaceae) and Other Underutilized Traditional Oil Trees from Western Zambia  
[PERSON]  
1 Department of Food Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamycka 129, 16500 Praha-Suchdol, Czech Republic; [EMAIL_ADDRESS] (A.F. ); [EMAIL_ADDRESS] (B.R. ); [EMAIL_ADDRESS] (C.P.) 2 Department of Crop Sciences and Agrorostry, Faculty of Tropical AgriSciences, Czech University of Life Sciences Prague, Kamycka 129, 16500 Praha-Suchdol, Czech Republic; [EMAIL_ADDRESS] (A.M.); [EMAIL_ADDRESS] (Z.P.) 3 Department of Chemistry, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamycka 129, 16500 Praha-Suchdol, Czech Republic; [EMAIL_ADDRESS]  
4 Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamycka 129, 16500 Praha-Suchdol, Czech Republic; [EMAIL_ADDRESS] (C.N. ); [PERSON]_ADDRESS] (D.D.) 5 PriedelDCATE, P.O. Box 910316, Mongu, Zambia; [EMAIL_ADDRESS]  
6 School of Natural Resources, University of Baroesteland, P.O. Box 910316, Mongu, Zambia; [EMAIL_ADDRESS]  
7 [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]. systems are thus at significant risk of being lost due to the expansion of intensive agriculture and concentration on a single crop. A similar trend can be seen in the loss of traditional knowledge, culture, and skills of indigenous peoples. With this decline, agroobidiversity is also disappearing as well as many traditionally consumed edible species (including varieties), whose existence is considered to be threatened or that are already extinct [4]. Particularly in developing countries, these consequences can ultimately lead to food insecurity and the use of unsafe food sources [5]. Zambia is one of the third-world countries where food security and safety are significantly worsened by agroobidiversity loss. Parts of Zambia, especially the western province (formerly Barotseland), now suffer from hidden hunger and limited accessibility to good-quality food [6; 7]. High-yielding crops such as maize, rice, cassava, mangos, tomatoes, cashew nuts, and groundnuts that require a lot of water and fertilizer are often substituted for traditional food plants and wild foods. Because of the semiarid climate in the western province, conditions for cultivation of high-value, resource-demanding species are challenging to achieve (personal communication, 28 November 2018). Given the proximity to the botanically rich South African floristic regions, Zambia has a diverse range of flowering plants covering more than 3500 species [8]. Despite this fact, the local people seem to overlook the nutritional and commercial potential in these traditionally used species, and the knowledge about these local fruits, vegetables, and oil crops is rapidly disappearing ([PERSON], unpublished data). The vast majority of these species have not been described by means of modern scientific methods [9]. Hence, the identification and documentation of traditional foods from developing countries is currently of the utmost interest. Undoubtedly it can lead to advantages to both developed and developing countries in terms of economic potential from their commercialization as food or food supplements. This can be demonstrated by açai fruit (_Euterpe oleracea_) and camu camu (_Mycaria duibia_). Those plants, traditionally used in South America, remained unknown to the western market until the 1990s, but nowadays are sold worldwide as rich sources of vitamin C and other antioxidants [10]. Nowadays the market with edible oils in Zambia is increasing; however, the local production covers only one-third of the market demand. The major cultivated oil-bearing plants are soybean, cotton seed and sunflower, accounting for 60, 19 and 15% of local production, respectively.