Abstract
East African highland cooking bananas (EA-AAA) are a staple food and major source of calories for Ugandans. Cooking bananas are considerably wasted along the postharvest chain majorly due to poor handling and ripening. Banana waste is a potential source of secondary products such as pectin, wine, beer to mention a few. The aim of this study was to extract and characterize pectin from selected cooking bananas at various stages of ripening in order to assess their potential for commercial pectin production. Pectin was extracted from the bananas at five stages of ripening i.e. stages 0 (green maturity), 1, 2, 5 and 7. Extracted pectin at stages 2, 5 & 7 was characterized. Pectin yield from banana pulp decreased significantly with ripening (P<0.05) from between 18.1 to 22.65% at green maturity to between 0.65 to 1.28% at stage 7 of ripening. Pectin yield from banana peels was generally lower decreasing from between 5.34 to 6.61% at green maturity to between 1.01 to 1.38% at stage 7. The equivalent weight (1774 to 10144) of the pectin at selected stages of ripening was not significantly different (P>0.05) except individually. Methoxyl content was not significantly different among cultivars (P>0.05), however, it increased significantly through ripening stages (P<0.05). Anhydrouronic acid (AUA) ranged between 24.51 to 67.38% and increased with stage of ripening. AUA of pectin from pulp and peel did not differ significantly (P>0.05). The degree of esterification at each of the three stages was generally high (77 to 94%) implying high gelling power. These results showed that purity of pectin increases while yield decreases with ripening and that banana pectin has a high degree of esterification implying rapid set pectin. Thus, banana peel and pulp can be good sources of industrial pectin.
Highlights
Bananas are the fourth most important food crop in the world after rice, wheat and corn (Arumugam & Manikandan, 2011)
The degree of esterification at each of the three stages was generally high (77 to 94%) implying high gelling power. These results showed that purity of pectin increases while yield decreases with ripening and that banana pectin has a high degree of esterification implying rapid set pectin
There was a significant decrease in pectin yield (P
Summary
Bananas are the fourth most important food crop in the world after rice, wheat and corn (Arumugam & Manikandan, 2011). They are an important staple food in tropical countries where they contribute to food security (Kabahenda, et al, 2010). The banana fruit is a good source of energy and minerals and is normally consumed fresh or processed to make products such as crisps, flour/powder, jam and wine. Most cooking bananas (Matooke) are harvested and consumed at green maturity (Gafuma, Byarugaba-Bazirake, & Mugampoza, 2018). Edible by-products can be generated from banana peel and pulp as part of the waste http://jfr.ccsenet.org
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