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Two types of hydrogen bonds (H-bond) can be formed when a carotenoid containing a hydroxy group, such as retinol, interacts with a silanol group on the surface of MCM-41. H-bond 1, the oxygen atom of the carotenoid interacts with the proton of the SiOH group on the surface of MCM-41, and H-bond 2, the proton of the OH group of the carotenoid interacts with the oxygen atom of SiOH group on the surface...
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