water, which, among other things, influenced the final results. Some researchers did notreveal caffeine concentrations per portion of the brew. It is important from the point ofview of the consumer and the practical application of the obtained results. It seems that toeffectively compare the influence of certain factors on caffeine content, the other variablesshould be kept constant. Moreover, it seems that many consumers drink coffee becauseof its taste and aroma. Therefore, the type of coffee and the method of brewing should bechosen according to preferences
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