Effect of Varying Drying Temperature on the Soluble Sugar and Nutritional Content of Banana

E.E Alagbe1, *
, Y.S Amlabu1, E.O Daniel2, M.E Ojewumi1
1 Department of Chemical Engineering, Covenant University, Ota, Nigeria
2 Department of Microbiology, Benson Idahosa University, Benin City, Nigeria

© 2020 Alagbe et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Chemical Engineering, Covenant University, Ota, Nigeria Tel: +2348123187054; E-mail:



In this work, the effect of drying temperature on the available carbohydrate is investigated.


Nigerian climate favours the cultivation of banana and it is a ready fruit delight available in almost all homes. Hybrids and polyploids of the species musa acuminata and musa balbisiana are very common. Unfortunately, post-harvest losses of 40 – 60%, of this energy rich fruit are encountered yearly. Drying is very old method of preservation which has stood the test of time. Bananas are known to possess high carbohydrates with low glycaemic index which makes it a healthy fruit or snack.


To determine the optimum drying temperature for the drying of Banana fruit.


The banana fruit was peeled and sliced to about 5 mm thickness and dried in a tray dryer at varying temperatures of 40 °C, 50 °C, 60 °C and 70 °C. The control sample was air dried at the average prevailing temperature of 30 °C.


Results obtained showed that increased drying temperature leads to more loss of moisture from the samples and in turn, favoured an increase in the available carbohydrate in the dried fruit. The ash, fat and crude fibre content marginally changed with drying temperature.


The optimum temperature for treated and untreated samples, from the results obtained, were 60 °C and 70 °C respectively.

Drying impacts positively on the available sugar in the Banana fruit.

Keywords: Available carbohydrate, Banana drying, Glycaemic index, Post-harvest loss, Proximate analysis, Cassava.