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“For instance, in the preparations perfused with a medium containing 100 µM Zn2+ ] for 15 or 30 min, the first caffeine contractures were similarly depressed to about 60% of the control.”
“In small bundles of soleus muscle 2∼100 µM Zn2+ ] similarly caused a depression of caffeine contracture , and the activation dependence also was evident.”
Cellular Physiology and Biochemistry • 2002 | View Paper
“Among the various metal ions tested, Fe2+ was found to enhance the rate of degradation for all three substrates, whereas Zn2+ and Cu2+ inhibited the degradation of caffeine and theobromine but not 7-methylxanthine.”