The content of caffeine in coffee is related to the variety of coffee beans, the baking degree of coffee beans and the soaking time of coffee powder: robusta beans are much higher than Arabica beans; the deeper the coffee beans are roasted, the less caffeine is; and the longer the coffee powder is soaked, the more caffeine is extracted. So the same amount of beans, ESPRESSO made from deep-baked Arabica beans, has the least caffeine content.
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