Which is the reference method for amylase determination?

• A. Saccharogenic
• B. Amyloclastic
• C. Chromogenic
• D. Coupled-enzymatic-UV

Answer: (A)

The main idea being tested is which assay best reflects the actual enzymatic breakdown of starch by amylase. The saccharogenic method is the reference because it directly measures the products of the reaction—reducing sugars released from starch when amylase acts on it. By using a well-established colorimetric reaction (often with DNS or a similar reagent) to quantify these sugars, you get a direct, reproducible readout of amylase activity that is widely standardized and comparable between labs.

Other approaches rely on different principles and have limitations. Amyloclastic methods track the disappearance of the starch substrate by iodine binding, but the amount of starch that remains can be affected by reaction conditions and substrate quality, making the results less precise. Chromogenic methods use artificial substrates that may not perfectly mirror how amylase acts on natural starch, so the activity measured can diverge from true enzymatic behavior. Coupled-enzymatic-UV assays involve additional enzymes and detection steps, which can introduce more variables and potential interferences and are less uniformly standardized.

Thus, measuring the actual reducing sugars formed from starch hydrolysis provides the most direct, standardized assessment of amylase activity.