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They might measure the cabohydrates by chromatography. It wouldn't be very difficult.
A mixture of various components enters a chromatography process, and the different components are flushed through the system at different rates. These differential rates of migration as the mixture moves over adsorptive materials provide separation. Repeated sorption/desorption acts that take place during the movement of the sample over the stationary bed determine the rates. The smaller the affinity a molecule has for the stationary phase, the shorter the time spent in a column
How do they measure the carbohydrate content of a given liquid like say milk?
The problem is, how much of these carbohydrates are actually digestible (after all, is not cellulose also a carbohydrate, yet it is not digestible by humans)?
There are, and I have used, specialised chromatographic columns that do a very nice job of separating all the (common)monosacharides and all the (common) disacharides. If you put a selective detector on the end you could do a very good job of analysing carbohydrates.
I was actually looking for lactose but I ran a whole bunch of different monosacharides and also sucrose to prove that they were not present in the sample.