Due to the effects of heat, light, and acid, magnesium that is chelated at the center of chlorophyll is desorbed and the chlorophyll replaced by hydrogen molecules instead of magnesium changes to a dark brown component called pheophytin, which causes green color fading and brownish discoloration.
for example…
- Color change and color fading factors by heat:
When there are processes to apply heat such as baking, simmering, steaming, and heating for sterilization in the production process of foods and beverages containing matcha.
- Color change and color fading factors by light
When the foods or beverages containing matcha are exposed by food shelf light, showcase light or sunlight, etc.
- Color change and color fading factors by acid.
When matcha is used for the acidic food or beverages such as Miso(Soybean paste), dressings and alcoholic beverages and so forth.
In the past, there was no solution to prevent color fading or color change of matcha other than supplementing the green color of matcha with chlorella or coloring agents.
However, there was a problem that the effect was limited and the original flavor and taste of matcha were impaired.