Evaluation of alginate-pectin capsules in cheddar cheese as a food carrier for the delivery of folic acid

Edible gums were evaluated for folic acid encapsulation efficiency as single and mixed polymers. Alginate and pectin yielded the highest encapsulation efficiencies, 216 and 196 mu g/100 g, respectively. Upon being combined and the encapsulation conditions optimized, the alginate-pectin (alg-pect) mixture resulted in 360 mu g/100 g of folic acid being encapsulated. The alg-pect capsules were tested for their stability in a milk system where pH was adjusted from 6.7 to 4.5 over a 4 h period. Folic acid retention under the test conditions was retained at 360 mu g/100 g within the alg-pect capsules indicating their ability to remain intact in a milk system. Stress tolerance of the capsules was tested under simulated cheese press pressures for 4 h until a force of 0.814 N/cm(2) was detected. Folic acid retention of up to 288 mu g/100 g was recorded for the alg-pect capsules. Three stages in Cheddar cheese manufacturing namely; addition of capsules in the milk, incorporation of capsules after milling the curd and injection into the pressed block of raw cheese, were studied for capsules distribution. The former had the most even distribution of capsules while the latter two had poor and irregular distribution. Encapsulated folic acid showed more stability (360 mu g/100 g) than the free folic acid (109 mu g/100 g) in Cheddar cheese during the 3 months ripening period. (c) 2005 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.