Hydroxy group hydrophilic properties

The presence of both a hydrophilic and hydrophobic moiety per monomer unit lends this class of polymers its favourable physical and chemical properties for peptide synthesis. From a theoretical point of view, the reactivity of the two hydroxy groups in polyethers, such as polyethyleneglycols, should be identical and of the same order as that of the corresponding low-molecular weight analogues165). 

Cellulose, a disaccharide of D-glucose, represents the basic molecule, stereo-chemically differing from dextrose in the bonds existing between the two monomers a )S-glycoside bond in cellulose and a a-glycoside bond in dextrose. To increase hydrophilic properties, methoxy- and hydroxypropyl- side-chains are replaced by hydroxy groups (Fig. 22). The molecule is uncharged. 

A free hydroxy group is always formed besides the secondary amine group. This increases the hydrophilic property of the resin. The general drawback is that a high pH is required for immobilization. High concentrations and temperature (40 °C) can increase the yield. Some resins with group-specific ligands (such as iminodiacetic acid) are produced by this method. Other popular immobilization methods include ... 

ABSTRACT This review summarises the chemistry of Olea europaea, in particular of hydrophilic components, which are seen as the key compounds responsible for several properties, identified as the organoleptic characteristics of foods derived from O. europaea and as the biological properties attributed to this plant, like ipotensive, anti-oxidising, etc. In fact, two groups of polar compounds can be identified in O. europaea terpenenoids, as oleuropein phenols, as hydroxy-phenyl ethanol derivatives and compounds related to these two categories. 

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