Determining Overages in Fortified Food Applications
by Ram Chaudhari

Fortified foods can play a significant supporting role in the well-being of today's consumers as they continue to understand the long-term benefits of a nutritionally balanced diet. Food and beverage manufacturers are responding to consumer interest by turning to fortification, specifically combining multiple ingredients to capitalize on scientific advances revealing how certain food components can contribute to overall health and wellness, as well as delay the onset of diseases such as cancer, osteoporosis, diabetes and other ailments.

Multiple ingredients can be incorporated into a fortified food or beverage product; but, formulation of these products goes beyond just adding a few vitamins here, a cup full of antioxidants there and tossing in some botanicals. Understanding proper ingredient selection and determining overages for each ingredient that are specific to finished product composition, along with processing conditions employed to manufacture a marketable product, and how to blend them into a nutrient premix are key points manufacturers must take into consideration at the very beginning of the product development process.

Important technical aspects of food and beverage fortification are the choice of carrier, nutrient interactions, bioavailability of nutrients, and stability of nutrients relative to their storage and processing conditions. A well-formulated product should not cause nutrition imbalance, and excessive intake of nutrients should not have adverse effects. One key concept in formulation is determining appropriate overage. This term refers to the use of kinetic data on nutrient stability to calculate the amount of added nutrient so that the anticipated level of the nutrient at the end of the product's shelf life is in accordance with the level indicated on the label.

One of the very few attributes vitamins have in common is none of them are completely stable in foods. The stability of the individual vitamins varies from relatively stable, such as niacin, to highly unstable, such as B1, A and C. While the factors affecting stability vary from vitamin to vitamin, the most important are heat, moisture, oxygen, pH and light.

Vitamin degradation can take place naturally during storage, processing and preparation of finished foods and interactions with other components of foods. The factors that affect the degradation of vitamins are the same, whether the vitamins are endogenous in foods, or are added as fortificants.

Because of these stability issues, appropriate overages must be incorporated during the development phase of a food/beverage. In addition, one has to consider the following to meet the label claims at the end of shelf life:

* Endogenous levels of vitamins
* Vitamins to be included, to allow for their variable stability
* Overages to compensate for degradation due to the factors mentioned above
* Analytical overages due to method variability from lab to lab

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