UWI notebook: Jamaican raspberry fruit with health-beneficial properties

Dr Camille Bowen-Forbes - Contributed

USING PLANTS TO TACKLE DISEASE

Scientific studies clearly demonstrate the relationship between diet and health. Inflammatory diseases such as diabetes, cancer and cardiovascular disease are leading causes of death in Jamaica. With the high occurrence of these diseases locally, as well as worldwide, it becomes increasingly important to find alternative treatments which are more economical than commercially available medicines. One such alternative is the use of traditional medicine, using plants and plant extracts. The active ingredients in both are called phytochemicals.

JAMAICA - HOME TO EXOTIC FRUITS

Of the 3000 species of flowering plants grown in Jamaica, 27 per cent are endemic, or native to the island. Additionally, many of the species that produce edible fruits are not known by the general populace and are therefore under-utilised. As a vast number of our fruit species have not been scientifically studied, a unique and significant opportunity for research presents itself.

Lecturer in the Department of Chemistry at the University of the West Indies, Mona, Dr Camille Bowen-Forbes, has a keen interest in the investigation of these fruits and their phytochemicals, which could potentially lead to the discovery of positive biological properties of a number of our wild fruit species and the compounds they contain. This could be beneficial for health. Dr Bowen-Forbes observed that scientific research has driven the commercialisation of a number of fruits and fruit products, resulting in increased production and market value of the products derived from the fruit. For example, the recent discovery of the anti-cancer properties of the pomegranate has resulted in considerable commercialisation of various value-added pomegranate products such as juices, wines, extracts, capsules and cosmetics.

UWI TAKES AN INTEREST

Dr Bowen-Forbes has, for the last two years, been studying exotic or uncommon edible Jamaican fruits that grow wild, and conducting research into their health-beneficial properties and biologically active constituents. The research has the potential to lead to the discovery of new plant sources that may be used in the treatment of diseases, as well as the development of value-added food products of health benefit to consumers in Jamaica, the region and beyond. This research should contribute significantly to our food and agricultural industries and may also have a positive impact on the pharmaceutical industry.

JAMAICA'S BLACKBERRY AND RASPBERRY FRUITS

Blackberries and raspberries are from the Rubus genus,which consists 250 species of plants. These and other small fruits have been gaining popularity in the diet due to their possession of natural antioxidants and other non-nutrient phytochemicals which improve health. Five Rubus species are found in Jamaica, one produces blackberries and four bear raspberries. All are edible, yet none of these species is well known.

Rubus rosifolius is a red raspberry found in the Caribbean, Hawaii, Australia and Asia. Also called the West Indian raspberry, it is one of the many fruit-bearing plants in Jamaica that is underused, being known and eaten by only a minority of the populace. It grows wild in the cooler, hilly areas at elevations between 1500 and 3000 feet. This species was the first among the group to be studied, as it was the most available at the time of sample collection. It is the first time that the red raspberry was being studied in Jamaica.

When Rubus rosifolius fruits were extracted, it was found that all three extracts exhibited antioxidant activity. The extract showing the greatest activity was subjected to further investigation and eight phytochemicals were isolated and, for the first time, reported from Rubus rosifolius. Additionally, one of the compounds was, for the first time, reported from this group, the Rubus genus. The compounds were tested for antioxidant, anti-inflammatory and anticancer activities. Four of the compounds isolated from Rubus rosifolius exhibited good antioxidant activity, comparable to that of carotene, a powerful antioxidant found in foods such as carrots. Three compounds showed low to moderate anti-inflammatory activity and two demonstrated anti-cancer activity, moderately inhibiting the growth of human colon cancer cells.

RASPBERRIES - GOOD FOOD

These results demonstrate that red raspberries and their phytochemicals have the potential to improve health. They also demonstrate that Rubus rosifolius is a local fruit that possesses good biological properties and eating it can promote health. These findings also suggest that Rubus rosifolius would be a good crop for cultivation and processing into products such as juices, jams, wines, ice cream and yoghurt. The cultivation of this crop and subsequent processing into value-added products would involve farmers, agricultural scientists and food processors.

This research was done in collaboration with Professor Muraleedharan Nair of Michigan State University.