Guanine minerals

In 1929, after many years of persevering endeavor, Levene - " succeeded in isolating the sugar in crystalline condition by extremely mild hydrolysis of very pure guanine nucleoside. The nucleoside was treated with very dilute mineral acid (effective acidity, 0.01 N) during 10 minutes... 

Dihydrate, long prisms from water. The water of crystn is given up at 118 and is taken up again at room temp. When anhydrous, dec ISO (closed tube). [ ]g —8 (c 2) —65 (c = 2 in 5% NaOH), Acid to litmus. Soluble in cold water, freely sol in hot water. Boiling with dil mineral acids yields guanine, H P04, and D-ribose. 

Furthermore, the results helped to characterize how nucleic acid molecules are adsorbed on clay minerals including kaolinite [28, 29], For example, double stranded DNA molecules that differ in their guanine-cytosine content were adsorbed in equal amounts by clays including kaolinite [49]. Linear DNA was revealed to be adsorbed on illite and kaoUnite to a greater extent than on montmorillonite [60]. This emphasizes the influence that positive charges of the lattice edges and the microorganization of clay particles have on the mechanism of DNA adsorption. 

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