Development of a Novel Integrated Approach to Monitor Processing of Cassava Roots into Gari: Macroscopic and Microscopic Scales
Gari is a key staple food in several western African countries. This is a cassava traditional semolina obtained after peeling, rasping, fermentation, pressing, sieving, and roasting (cooking/drying). The process of gari production is artisanal and relies on human know-how, and the final properties of gari are highly dependent on the human skills. So as to understand the combined effect of the various transformation steps on the final quality of gari, the main objective of this work was to develop a lab-scale integrated approach to follow the transformation of the product characteristics during the process using macroscopic (water content, solid volume fraction, and particles size) and microscopic (physicochemical and biochemical) responses. At the microscopic level, pressing is a key step insofar as it induces the draining of many soluble compounds (especially the toxic cyanogenic compounds). At the macroscopic level, despite the strong similarity in median diameters of the intermediate and final products, two distinct agglomeration mechanisms occurred during the pressing/sieving and the roasting. These mechanisms highlight the structuration of the product at two different scales and at two different moments. Finally, results showed a high swelling capacity for fermented gari. The approach developed in this work will make it possible to identify the robust mechanisms, i.e., those little affected by a change in scale or in operating conditions. This identification will thereafter allow to distinguish unit operations, fairly easy to mechanize, from those requiring strict control to achieve the final product quality sought.
KeywordsCassava Gari Lab-scale processing Physicochemical properties Hydro-textural diagram
This work was supported by the CIAT Cassava Project (Colombia), CIRAD Qualisud Research Unit, and CIRAD - PhD fellowships, helps to PhD students (France), and University of Abomey Calavi, Faculty of Agronomic Sciences (Benin), and funded mainly by the CGIAR Research Program on Roots, Tubers and Bananas (RTB) with support from CGIAR Fund Donors (http://www.cgiar.org/about-us/governing-2010-june-2016/cgiar-fund/fund-donors-2/).
- Agriculture IIoT (1990) Le manioc en Afrique tropicale: un manual de reference. Institut international d'agriculture tropicale.Google Scholar
- Bechoff A, Tomlins K, Fliedel G, Becerra Lopez-lavalle LA, Westby A, Hershey C & Dufour D (2016) Cassava traits and end-user preference: relating traits to consumer liking, sensory perception, and genetics. Critical Reviews in Food Science and Nutrition, 1–21.Google Scholar
- Collard, P. & Levi, S. (1959). A two-stage fermentation of cassava. Nature, Lond. 183(4661: 620621).Google Scholar
- Ejiofor MAN, Okafor, N. (1981) Comparison of pressed and unpressed cassava pulp for gari making. In: E.R. Terry KAO, and F. Caveness (ed) Tropical root crops: research strategies for the 1980s. Proceedings of the first triennial root crops symposium of the international society for tropical root crops Africa branch, 8–12 September 1980, Ibadan, Nigeria. p^pp 154–158, International Development Research Centre Monograph IDRC- 163E.Google Scholar
- FAO/WHO (1995) Joint FAO/WHO Food Standards Programme, Codex Alimentarius Commission In, vol XV. p^pp 101-106. FAO, Roma, Italy.Google Scholar
- James B, Okechukwu R, Abass A, Fannah S, Maziya-Dixon B, Sanni L, Osei-Sarfoh A, Fomba S & Lukombo SS (2012) Producing gari from cassava: an illustrated guide for smallholder cassava processors. International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria.Google Scholar
- Muchnik, J. & Vinck, D. (1984). La transformation du manioc: technologies autochtones. Agence de coopération culturelle et technique.Google Scholar
- Nago CM (1995) Artisanal gari production in Benin. Technological and physico-chemical aspects. In: Cassava processing. p^pp 475–493, Paris ORSTOM editions.Google Scholar
- Olayinka Sanni, M. (1991). Gari processing in Ibadan metropolis: factors controlling quality at the small-scale level. In, 1994. International Society for Horticultural Science (ISHS), Leuven, Belgium, pp 256–260.Google Scholar
- Samira, S., Seyed, S. S., Mortaza, A., Evangelos, T., & Abdolreza, K. (2017). Microencapsulation of walnut oil by spray drying: effects of wall material and drying conditions on physicochemical properties of microcapsules. Innovative Food Science and Emerging Technologies., 39, 101–112.CrossRefGoogle Scholar