Arvind Lavji Thakkar

Cyclohepta-amylose inclusion complexes. A proton magnetic resonance study

Proton magnetic resonance provides direct evidence for the inclusion nature of cyclohepta-amylose complex formation with aromatic substrates.

Self-association of benzylpenicillin in aqueous solution: 1H nuclear magnetic resonance study

Concentration dependence of 1H n.m.r. spectra suggests that benzylpenicillin ions aggregate in aqueous solution primarily through hydrophobic interactions of the benzyl side chains.

Self-association of caffeine in aqueous solution: 1H nuclear magnetic resonance study

A possible mode of self-association of caffeine in aqueous solution is suggested on the basis of the concentration dependence of chemical shifts.

Aggregation of (+)-propoxyphene hydrochloride in aqueous solution: circular dichroism measurements

Comparison of these regression lines, in pairs, by the method of Newton & others (1971), proved that the lines did not differ significantly from each other. A common regression equation : gX = 0.1 14A-0.517 (0.981) fitted the data. These results suggest that compaction force or pressure does not completely characterise the formation of a tablet. Varsano & Lachman (1966), de Blaey & Polderman (1970) and Fell & Newton (1971) have reported the measurement of work done in making the tablet. Without the consideration of the time factor involved, work done may also be inadequate. For instrumented tablet machines without systems for accurate determination of punch travel, the present concept of force-time measurement offers a possible solution.