For the results of a chlorophyll level, why do you display the results of chlorophyll a and b? if we can only display the results of total chlorophyll ?
The molecular properties and solubility of chlorophyll a and b are different. Their amount changes under environmental conditions; Therefore, in addition to the amount of ،total chlorophyll, amount of chlorophyll a and b is also calculated and announced separately.
In thin layer chromatography, they create two spots, chlorophyll a is blue-green (higher) and chlorophyll b is green (lower).
Maybe I miss the essence of the question but from a physiological point of view there is an important reason to determine both Chl a and b. The core antenna of PS II only contains Chl a, whereas the outer antenna contains both Chl a and b. Changes in the Chl a/b ratio may tell us something about changes in the PS II antenna size. There is a small complication in the sense that PS I and PS II differ in their a/b ratio. So, changes in this ratio can also be caused by changes in the PS I to PS II ratio. Either way, the Chl a/b ratio is an important physiological parameter in photosynthesis research.