Table 7.

The melting point values of the drugs and their physical mixtures and dried residues after adsorption processes.

Serial no.	Test	Melting point (MP)
1	Metronidazole (Metro) pure powder	162
2	Kaolin (Kln) powder	>300
3	1:1 (Metro:Kln) powders physical mixture	290
4	1:2 (Metro:Kln) powders physical mixture	320
5	Dried residue (1 g Kln in 20 ml 0.1 M HCl pH 1.2; shaken 2 h; centrifuged, residue collected and dried at room temperature)	220
6	Dried residue (1 g Kln in 20 ml 0.1 M HCl + 40 mg Metro pH 1.2; shaken 2 h; centrifuged, residue collected and dried at room temperature)	260
7	Dried residue (1 g Kln in 20 ml Phosphate buffer pH 6.8; shaken 2 h; centrifuged, residue collected and dried at room temperature)	200
8	Dried residue (1 g Kln in Phosphate buffer + 40 mg Metro + pH 6.8; shaken 2 h; centrifuged, residue collected and dried at room temperature)	280