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bioRxiv · 10.1101/679589

Controlling swelling and release of hyaluronic acid during aqueous storage by in situ cross-linking during spray drying with alginate

Wong, D.·Cunniffe, J. C.·Scher, H. B.·Jeoh, T.
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Abstract

The success of hyaluronic acid in over-the-counter cosmetics has been limited by its poor storage stability in aqueous environments due to premature swelling and hydrolysis. Here, hyaluronic acid was prepared in dry microparticles, encapsulated by spray-drying in patented in situ calcium cross-linked alginate microcapsules (CLAMs) to minimize swelling and release in aqueous formulations. CLAMs prepared with 61% (d.b.) hyaluronic acid (HA-CLAMs) demonstrated restricted plumping, limited water absorption capacity, and reduced leaching; retaining up to 49 % hyaluronic acid after 2 hrs in water. A new method using chelated soluble calcium resulted in particles with significantly improved hyaluronic acid retention in water. Chelate HA-CLAMs exhibited nearly full retention of hyaluronic acid over 2 hr incubation in water, and remained visibly insoluble after 1 year of storage in water at 4{degrees}C. Successful hyaluronic acid retention in CLAMs is likely due to the ability of hyaluronic acid to participate in calcium cross-linking.

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Wong, D., Cunniffe, J. C., Scher, H. B., Jeoh, T.. 2019-07-04. Controlling swelling and release of hyaluronic acid during aqueous storage by in situ cross-linking during spray drying with alginate. https://doi.org/10.1101/679589

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