Starch in banana

The primary carbohydrates are starch, sugars (fructose, glucose, sucrose), and non-starch polysaccharides (for example, pectin, cellulose, hemicellulose) that are part of “dietary fiber”.

The starch in green banana is very indigestible, but as the banana ripens, the starch is converted to digestible sugars. Unripe bananas contain mostly starch, which makes up 70–80% of their dry weight. Much of that starch is resistant starch, which is not digested in the small intestine. It is absorbed slowly and does not cause sharp rises in blood sugar. The starch acts as food for the growth of beneficial microbes in the digestive tract.

As the banana fruit ripens, the starches (which are found in organelles called amyloplasts) break down. The breaking down of the starch into simpler sugars will make the fruits taste a little sweeter and be softer.

When the skin is yellow green, 40 percent of its carbohydrates are starch; when the skin is fully yellow and the banana is ripe, only 8 percent of the carbohydrates are still starch.

The starch content of bananas (Musa acuminata, “Cavendish”) has been reported to change from approximately 21 g/100g in unripe fruit to approximately 1 g/100g in fully ripe fruit. During ripening there is a decrease in enzyme-resistant starch and an increase in water-soluble pectin.

Ripe bananas have a low GI of 51, due to the higher carbohydrate content of bananas. The type of carbohydrate in bananas is classified as resistant starch, which functions similarly to dietary fiber. Resistant starch is not broken down in the small intestine so it causes less glucose to be released into the bloodstream.
Starch in banana

Ripening process of banana

Bananas are good sources of carbohydrate, whether unripe or overripe. The green banana is dry and bitter; the ripening process makes the fruits become edible. They become sweeter less green and soft.

Tissue softening commences, during which starch is degraded to sugars in both pulp and peel, and rupture strength of cell walls slowly deteriorates. The ripening process involves the hydrolysis of the starch in the ripening plant. There is a rapid decline in starch content and a corresponding increase in sugar content.

Most of the sugar in ripe banana is sucrose, glucose, and fructose, sucrose being predominant.

This activity is a form of autolysis (self-digestion). The starch also can be broken down after consumption via action of pancreatic alpha-amylases, as well as other enzymes.

The water content of the pulp increase by 3 to 4% during the 10-11 days required for ripening to ‘eating ripe’.

During ripening, peel color changes from dark green to bright yellow and this is due to chlorophyll breakdown which gradually unmasks the carotenoid pigments also present in the unripe peel.

During the color changes the pulp becomes softer and sweeter as the ration of sugars to starch increases.
Ripening process of banana

Carbohydrates in banana

The primary source of energy for the body comes from carbohydrates. Carbohydrates are essential for better health and performance.

The digestibility of the carbohydrates in banana depends on the degree of ripeness. The ripening process of banana involves the hydrolysis of the starch in the ripening plant.

The starch in green banana is very indigestible, but as the banana ripens, the starch is converted to digestible sugars.

When the skin is yellow green, 40 percent of its carbohydrates are starch; when the skin is fully yellow and the banana is ripe, only 8 percent of the carbohydrates are still starch. The rest have broken on into sugars. 

The carbohydrates of banana are not only readily absorbed but appear to be particularly well tolerated by the diabetic, the sprue victim and the infant affected with celiac disease.
Carbohydrates in banana

Banana Physical Characteristics

Banana Physical Characteristics
Healthy filling, and even already wrapped for the consumer, bananas are one of nature’s ideal foods and the world’s most popular fruits. They are undoubtedly an extremely healthy food.

Bananas have the beneficial combination of being rich in carbohydrate – the average banana provides about 95 calories – while containing little fat. Bananas contain nearly all the essential vitamins in particularly vitamins C, B6, B2 and folate – as well as magnesium and potassium. Potassium is a vital mineral for muscle development and also helps to regulate blood pressure.

No other fruit so readily or so widely eaten as a snack in developed countries, Bananas also rarely cause allergic reactions, apart from migraine headaches and indigestion in a few adults, and are popular first solid food for babies.

They are also useful for treating childhood stomach upsets, although there is as yet in firm evidence to support the theory that bananas may help cell and mucus production in the stomach lining, thereby healing ulcers and preventing new ones.

Aside from these general properties, the bananas industry has been assiduous in prompting the use of the fruit for specific dietary needs, most notably by sportspeople such as tennis players and racing cyclists, who have an increased need for vitamins and minerals as well as for carbohydrates without associated fats.

Bananas also contain a high level of natural sugar, in both their fresh and dried form, which they release quickly into blood stream.

The banana industry has also pointed out that the unique combination of vitamins and sugars within bananas releases energy onto the body over long time improving stamina and the powers of endurance and concentration.
Banana Physical Characteristics