The pigments of green tea consist of chlorophylls and carotenoids. Chlorophylls are dominant pigments of fresh
green tea leaves3
, but easily degrade, turning into pheophytin and pheophorbide after heating and storing
processes3-6. In green tea, pheophorbides content is lower than pheophytins. This is due to the fact that the
chlorophylase enzyme is made non-active during the post-harvesting and steaming process whereas the formation of
pheophytin is attributable to the storing process3
. During the increase in storage time, the acidity is also increasing.
The result is a reaction between chlorophylls and acids, in which acid removes the magnesium ion and replaces it
with two hydrogen atoms giving an olive-brown solid, pheophytin.
The pigments of green tea consist of chlorophylls and carotenoids. Chlorophylls are dominant pigments of freshgreen tea leaves3, but easily degrade, turning into pheophytin and pheophorbide after heating and storingprocesses3-6. In green tea, pheophorbides content is lower than pheophytins. This is due to the fact that thechlorophylase enzyme is made non-active during the post-harvesting and steaming process whereas the formation ofpheophytin is attributable to the storing process3. During the increase in storage time, the acidity is also increasing.The result is a reaction between chlorophylls and acids, in which acid removes the magnesium ion and replaces itwith two hydrogen atoms giving an olive-brown solid, pheophytin.
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