Purple sweet potatoes 'new food colours'

Washington, Sept. 9 : Purple sweet potatoes, black carrots or purple carrots have replacement for traditional synthetic colours and colours derived from beetles.

Stephen T. Talcott, Ph.D., Texas A and M University, said that the natural colours industry for foods and beverages is gaining in value as U.S. and international companies move towards sustainable and affordable crop alternatives to synthetic red colours and red colours derived from insects.

He said that in addition to adding eye appeal to foods and beverages, natural colourings add natural plant-based antioxidant compounds that may have a beneficial effect on health.

Talcott said that one major change, he said, is the appearance of root crops like black carrots and purple sweet potatoes (PSPs), which are grown specifically for the natural colours industry.

He asserted that the have become primary agricultural products, compared to fruits such as grapes, which are grown for other purposes and used as secondary or byproduct-based colours.

Talcott focused on the range of colours - from light pink to rose, red and deep purple - that can be obtained through use of the pigments in PSPs.

He observed that though available commercially in the United States since 2006, it still is hard to find in stores, PSPs have the same anthocyanin pigments found in black cherries. Baked, used for french fries or prepared in other ways, PSPs taste like regular sweet potatoes.

Talcott said that PSP anthocyanins have proven to be among the best for food and beverage colouring, citing fruit drinks, vitamin waters, ice cream and yogurt.

They are stable, for instance, and do not break down easily; have superior coloring properties; and have a relatively neutral taste (in contrast to the slightly earthy, bitter taste from grape-based colourings). The pigments, however, are very difficult to extract.

--ANI (Posted on 10-09-2013)

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