The present invention relates to the technical field of deep processing of tea, specifically to a preparation method of tea essences particles. The present invention provides a preparation method of tea essences particles, including a process of extraction, filtration and separation, purification and decontamination, activation of activity and improvement of bioavailability, and spray granulation, which enhances activity and bioavailability of the active ingredient of the tea essences, improves taste of the tea essences, and increases the product yield of the tea essences.

Disclosed is a water based method for extracting caffeine from alkaloid containing substances, in particular tea leaves. The method can be performed without the use of artificial substances. The method allows the other soluble, non-caffeine components of alkaloid containing substances to be part of the decaffeinated product, in particular, components such as catechins and antioxidants. Advantageously, the caffeine extracted from the alkaloid containing substances is reversibly adsorbed to an adsorbent and high percentile of the caffeine can be recovered from the adsorbent.

Disclosed is a water based method for extracting caffeine from alkaloid containing substances, in particular tea leaves. The method can be performed without the use of artificial substances. The method allows the other soluble, non-caffeine components of alkaloid containing substances to be part of the decaffeinated product, in particular, components such as catechins and antioxidants. Advantageously, the caffeine extracted from the alkaloid containing substances is reversibly adsorbed to an adsorbent and high percentile of the caffeine can be recovered from the adsorbent.