Health Benefits of Phenolic Compounds in Bananas

Phenolic compounds in bananas are significant bioactive substances, widely studied for their potent antioxidant properties and associated health benefits. These compounds are present in both the pulp and peel of bananas, making the fruit a valuable addition to a healthy diet. The primary phenolic compounds identified in bananas include catechin, epicatechin, gallic acid, tannins, and anthocyanins.

Catechin and epicatechin, members of the flavonoid family, are particularly important for their strong antioxidant activity. Antioxidants like these neutralize harmful free radicals, unstable molecules that can damage cells and contribute to aging and various diseases, including heart disease and cancer. By reducing oxidative stress, catechin and epicatechin protect cellular health, potentially lowering the risk of chronic conditions. Additionally, these flavonoids have been associated with improved vascular function, which supports heart health by promoting better blood circulation and reducing blood pressure.

Gallic acid, another vital phenolic compound in bananas, is renowned for its anti-inflammatory and antimicrobial properties. Its ability to inhibit the growth of bacteria and viruses makes it a promising compound in promoting immune health. Furthermore, its anti-inflammatory effects can help in managing conditions like arthritis and other inflammatory diseases. This dual action of combating pathogens and reducing inflammation enhances the therapeutic potential of bananas.

Tannins, also present in bananas, have astringent properties that aid in wound healing by promoting tissue contraction and reducing bleeding. Their anti-inflammatory effects also help in alleviating irritation in the digestive tract, supporting gastrointestinal health.

Though present in smaller quantities, anthocyanins contribute to bananas' health profile. These pigments are typically responsible for the red, purple, and blue colors in fruits like berries, but in bananas, they provide subtle contributions to health by supporting cardiovascular function and potentially lowering the risk of certain cancers.

Overall, the diverse phenolic compounds found in bananas underscore the fruit's role as a functional food, with regular consumption providing both essential nutrients and bioactive substances that contribute to improved health outcomes and protection against chronic diseases.
Health Benefits of Phenolic Compounds in Bananas

Phytosterols

Phytosterols, also called plant sterols, are natural compounds belonging to the triterpene family. They are structurally similar to cholesterol, except for the presence of a methyl or ethyl group at the C-24 carbon atom of their side chain.

Up to now, more than 250 phytosterols have been identified, with β-sitosterol, stigmasterol, and campesterol being the most commonly found in the diet.

It possesses proven antidiabetic activity. Phytosterols can act as ligands for PPARs (Peroxisome proliferator-activated receptor), reduce visceral fat accumulation, and reduce the concentration of glycosylated hemoglobin, serum glucose, nitric oxide, and substances that react with thiobarbituric acid, and they can increase serum insulin and pancreatic antioxidants.

The importance of phytosterols is due to their action of reducing low-density lipoprotein (LDL) cholesterol levels, and a daily consumption of 2–3 g of phytosterols could decrease the LDL-cholesterol by 10–15%.

Banana fruit has been shown to contain a good amount of phytosterols both in the peel and pulp. The phytosterols content in unripe banana in the range of 2.8 to 12.4 g·kg DW has been reported.

Phytosterols isolated from banana flowers (e.g., β-sitosterol and 31-norcyclolaudenone) inhibit amylase as an uncompetitive inhibitor, with a km value of 5.51 μg/mL. Phytosterols also can be found in fruits, vegetables, beans, nuts, legumes, whole grains, tubers, wheat germ, vegetable oils, and sunflower seeds.

Phytosterols cannot be synthesized endogenously in humans and are derived solely from diet. The biosynthesis of these compounds occurs through the succession of 30 enzyme-catalyzed reactions.
Phytosterols

Usage and processing of banana essence

United Brands developed the first commercial all-natural banana essence and began marketing it in 1982 to be used in desserts toppings, juices and drinks.

Banana fruit has a pleasant flavor. Researchers have identified a total of 43 and 26 volatile flavor compounds in banana essence and fresh bananas, fruit paste, respectively. These volatile compounds included alcohols, esters, aldehydes and ketones.

During the processing, once the peels are separated the mashed bananas are passed through screens that vary in size and type. The puree is then homogenized.

The next process step, de-aeration, is one of the most important in determining the color of the finished puree. During the de-aeration under vacuum, the air present in the puree is removed to a large extent. The volatile components of the banana aroma are also removed and are condensed to produce banana essence.

Banana essence, extracted from ripe fruit, is a clear, colorless liquid which has an agreeable, concentrated aroma and is used in desserts, juices and drinks.
Usage and processing of banana essence

Essential oil in banana

Essential oils are complex mixtures of volatile compounds obtained by water or steam distillation of plant material.

Essential oils are usually colorless or pale yellow liquids with storing odor resembling the source plant materials. Analysis of the chemical compounds in banana has been carried out for the past 50 years.

Major compounds of banana fruits are acetates, butanoates, and/or 3-mthylbutyl esters.

Hultin and Proctor in 1961 have found the following substance in aqueous distillate of the banana: acetic acid, methyl alcohol, ethyl alcohol, methyl acetate, ethyl acetate, 2’-hexenal, pentan-2-one and possibly isoamyl alcohol, isoamyl acetate and 2-octanone.

McCarthy (1963), from chromatographic analysis of banana found that the banana-like flavor is due to the amyl esters of acetic, propionic, and butyric acids.

The compounded essential oil used extensively in the preparation of banana liqueur results from the blending of amyl and benzyl acetate and amyl and ethyl butyrate: the mixture is rounded off by the addition of essential oil (orange, lemon) and vanillin.
Essential oil in banana