Production of caffeinated and decaffeinated green tea catechin powders from underutilised old tea leaves

Production of caffeinated and decaffeinated green tea catechin powders from underutilised old tea leaves

Author: Quan V. Vuong and John B. Golding and Minh H. Nguyen and Paul D. Roach

Only the apical bud and the top four leaves are normally used to make high quality green teas, while the older lower leaves are cut and used for mulch. The aim was to determine whether the old fifth to tenth leaves could be used to make caffeinated and decaffeinated green tea catechin powders. The leaves were decaffeinated by blanching in water at 100 °C for 10 min to remove 80% of the caffeine while retaining 85% of the catechins. The leaves were then extracted in water at 80 °C and freeze drying gave 100% yields of extractable powder and catechins while spray drying gave 20–25% lower yields. Decaffeination and spray drying also increased the conversion of epistructured to non-epistructured catechins. Therefore, this study has shown that old green tea leaves, which are usually discarded, could be used as an underutilised source to make caffeinated and decaffeinated green tea catechin powders.

 

Get the whole article here

Shipping Icon Free Shipping + Free Returns
Subscription Details Icon
We stand behind our teas and teaware, and want you to be not just satisfied with them, but thrilled. If for any reason you're not, just let us know and we'll do our best to make it right.

{property.value} {property.value} {property.value} Include jar: {property.value}
×
You definitely need tools!
Perfect coldbrew everytime
The ideal way to store your matcha
The ideal way to store your matcha