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- W2489351650 abstract "The shells of pollen and spores are natural preformed microcapsules, evolved to protect reproductive materials of plants from air and light. The shells are constructed of two attached layers: the outer is sporopollenin (exine), which is largely lipophilic, and the inner (intine) is of mainly cellulose. The double layered hollow microcapsules can be obtained using base hydrolysis whereas the single layered ones require strong acid hydrolysis. These treatments remove all protein and thus produce microcapsules that are non-allergenic. The central void created is large and can contain large payloads up to 3:1 w:w, payload:microcapsule. Due to the porous nature of the shells they can be filled by simply mixing with hydrophilic or lipophilic actives under a vacuum. The shells have pronounced light shielding and antioxidant activity giving protection to oxidizable actives. Extra protection and control of release can be achieved aided by a protective substance either on the shell surface or coencapsulated within the shells. Release of actives can be achieved either by compression of the elastic shells or passive migration of active from the interior of the shells stimulated by pH, polarity, or biological environment, in some cases to enhance bioavailability of actives." @default.
- W2489351650 created "2016-08-23" @default.
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- W2489351650 date "2014-01-01" @default.
- W2489351650 modified "2023-10-16" @default.
- W2489351650 title "Pollen and Spore Shells—Nature’s Microcapsules" @default.
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- W2489351650 doi "https://doi.org/10.1016/b978-0-12-404568-2.00024-8" @default.
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