Fine green tea powders (GTP), with green and bright color, could
be prepared in the experiment. The GTP had a narrower and more
uniform particle size distribution, possessing more food processing
property. The contents of tea polyphenols and catechins decreased
while yellowness increased markedly with particle size decreasing
during superfine grinding, owing to increasing heat. So it is
important to control heat during grinding in order to keep GTP
green