Showing papers on "Theobromine published in 1971"

Theobromine and caffeine content of the cocoa bean during its growth

Abstract: Changes in the concentrations of caffeine and theobromine in the cocoa pod during its growth were determined. Theobromine and caffeine concentrations increased markedly after about 12 weeks from flowering to the time of harvesting. During the stage when the bean was only a mucilaginous mass, the quantity of caffeine and theobromine was negligible. Caffeine and theobromine levels in the shell, once this is formed, increased rapidly until harvest.

Structural Studies on Complexes. VI. X-Ray Investigation of A 2 : 1 5-Chlorosalicylic Acid : Theobromine Complex

Abstract: The dominant force of attraction in the 2 : 1 5-chlorosalicylic acid : theobromine crystalline complex is hydrogen bonding. There are three relatively strong hydrogen bonds, all involving a carboxyl group of the salicylate. A substantial degree of π overlap exists between the phenyl ring of the acid and the xanthine nucleus.

Cardioactive xanthinyl-guanylhydrazones

Abstract: Cardioactive xanthinyl-guanylhydrazones Title cpds. of formula (I) (where X is a xanthine ring such as theophylline or theobromine, R is H, alkyl, opt. substd. aryl or a heterocyclic ring, and n is 1-6) are prepd by conventional methods, pref. by condensing X(CH2)nCR=O with aminoguanidine or its salts. The products have superior cardiac activity to that of the present xanthines and their toxicity is low.