Microalgae extract could be novel source of lutein

By Stephen Daniells

- Last updated on GMT

Related tags: Antioxidant

Researchers in India have identified green colonial microalgae with
extractable carotenoids, especially lutein - the first time that
the antioxidant activity of the algae has been reported.

"The present study indicates the antioxidant potential of​ B. braunii for various health supplements and nutraceuticals. This is the first report of the evaluation of the carotenoid composition and antioxidant properties of​ B. braunii," wrote lead author Ambati Ranga Rao from the Central Food and Technological Research Institute in Mysore.

The research may provide the burgeoning lutein market with another extractable source of this in-demand carotenoid.

"The role of antioxidants in health and disease has been realized beyond doubt,"​ explained Rao. "And the search for different sources of antioxidants, especially natural ones, has acquired newer dimensions."

Indeed, European carotenoids were worth $348.5m in 2003, with 17 per cent of this coming from supplements.

Botryococcus braunii​ belongs to the family Chlorophycae and is known, say the researchers, for its production of hydrocarbons, exopolysaccharides and carotenoids.

The researchers evaluated the antioxidant activity of extracts from B. braunii​ using three different methods: radical scavenging (DPPH), hydroxyl radical scavenging, and assays for lipid peroxidation in both rat and human cells in vitro​.

The acetone extraction method provided 2.33 micrograms of carotenoids per milligram of algae, while extraction with other solvents like a two-to-one chloroform-methanol mixture led to recovery of 7.56 micrograms of carotenoids per milligram of algae.

"Lutein was the major carotenoid (75 per cent of the total carotenoids), followed by astaxanthin (18 per cent), beta-carotene (six per cent), alpha-carotene (0.3 per cent) and zeaxanthin (0.3 per cent),"​ wrote Rao in the Journal of Agricultural and Food Chemistry​ (Vol. 54, pp. 4593-4599).

For the DPPH radical scavenging assay, it was found that acetone extract exhibited a dose-dependent effect. For levels between six and ten parts per million (ppm) the free-radical activity was found to be between 56 and 68 per cent. This is equivalent to about 80 to 90 per cent of the activity of the synthetic antioxidant, butylhydroxyanisole (BHA), said the researchers.

In terms of hydroxyl radical scavenging activity, the effect was once again dose-dependent, with concentrations between six and ten ppm scavenging 45 to 65 per cent of the hydroxyl radicals - equivalent to between 50 to 75 per cent similar concentrations of BHA.

In rat cells, the carotenoid extract of the microalgae inhibited lipid peroxidation in kidney, liver and brain cells by 70, 71 and 71 per cent, respectively (10 ppm dose).

In human liposomes, LDL oxidation is reported as being inhibited by 71 per cent after six hours at a dose of 10 ppm.

"The present results substantiate that B. braunii extract is capable of preventing lipid peroxidation through scavenging free radicals and hydroxy radicals in living cells,"​ concluded the researchers.

This result could lead to an alternative source of carotenoids, particularly lutein. Microalgae are currently farmed as a source of carotenoids such as astaxanthin. For example, Algatechnologies has been producing the carotenoid from the microalgae Haematococcus pluvialis​ in closed culture for some years.

However, Brandon Lewis, technical service manager for Kemin Health, maker of FloraGLO branded lutein, told NutraIngredients.com: "This is the latest research confirming a long trend of science showing carotenoids as powerful antioxidants. At Kemin, we continue to believe marigold extract remains the most commercially viable source for purified crystalline lutein."

There has been growing consumer awareness of lutein and its role in boosting eye health, especially against age-related macular degeneration (AMD).

A recent survey from Frost and Sullivan, commissioned by Kemin Health, found that awareness of lutein has never been so high in Europe: in Italy and France it had doubled compared to last year, to 25.8 percent and 16 percent respectively.

Germans showed the greatest awareness, of 33.3 percent. The UK was the only country where it seemed to have slipped slightly, to 20 percent (compared to 25.8 in 2005). Spain had the lowest level, at 9.8 percent.

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