What is alpha amylase inhibitory assay?
What is alpha amylase inhibitory assay?
Alpha-Amylase Inhibitory Assay. This assay was carried out using a modified procedure of McCue and Shetty [17]. A total of 250 μL of extract (1.25–10 mg/mL) was placed in a tube and 250 μL of 0.02 M sodium phosphate buffer (pH 6.9) containing -amylase solution (0.5 mg/mL) was added.
How is alpha amylase inhibited?
Glucosidase inhibitors are commonly prescribed to diabetics to reduce postprandial hyperglycemia induced by the digestion of starch in the small intestine3. Polyphenolic fractions from plants have been shown to inhibit α-amylase and α-glucosidase activity and allow for tighter control of blood glucose10–12.
How does alpha amylase inhibitor work?
The alpha amylase inhibitor prevents starch digestion by completely blocking access to the active site of the alpha-amylase enzyme. Factors that affect the activity of the alpha-AI isoform inhibitor are pH, temperature, incubation time and the presence of particular ions.
What is alpha amylase inhibitory activity?
Inhibition of the mammalian alpha amylase enzyme in the intestine would delay the degradation of starch and oligosaccharides to monosaccharides before they can be absorbed. This would decrease the absorption of glucose and consequently reduce postprandial blood glucose level [5].
What is alpha amylase used for?
The most widespread applications of α-amylases are in the starch industry, wich are used for starch hydrolysis in the starch liquefaction process that converts starch into fructose and glucose syrups (57).
How do you calculate alpha amylase activity?
Amylase activity is determined using a coupled enzymatic assay, which results in a colorimetric (405 nm) product, proportional to the amount of substrate, ethylidene-pNP-G7, cleaved by the amylase.
What foods contain alpha amylase?
α-amylase inhibitors were found in common beans and runner beans (Phaseolus coccineus) at levels of 2–4 kg− 1 of seed meal. Field beans, black-eyed peas, and chickpeas contain low levels of 0.1–0.2 kg− 1 of seed meal.
What is amylase?
Amylase is an enzyme produced primarily by the pancreas and the salivary glands to help digest carbohydrates. This test measures the amount of amylase in the blood or urine or sometimes in peritoneal fluid, which is fluid found between the membranes that cover the abdominal cavity and the outside of abdominal organs.
How is the DNS assay method applied in experiments involving alpha amylase?
The α -amylase activity is measured using a colorimetric method with 3,5-dinitrosalicylic acid (DNS) reagent. In this method, starch by α – amylase is converted into maltose. Maltose released from starch is measured by the reduction of 3,5-dinitrosalicylic acid.
Is alpha amylase safe?
The studies support decision tree analysis for enzymes produced with biotechnology. The α-amylase is safe as processing aid in production of both human and animal food.
Which is the most potent alpha amylase inhibitor?
All compounds were tested in the alpha-amylase inhibition assay and the results revealed that the oleanolic acid and ursolic acid (2:1) mixture was a potent alpha-amylase inhibitor with IC(50)=2.01 microg/ml (4.41 microM) and that it contributes significantly to the alpha-amylase inhibition activity of the extract.
Why is alpha amylase an important therapeutic target?
The inhibition of alpha-amylase is an important therapeutic target in the regulation of postprandial increase of blood glucose in diabetic patients.
What is the DNS method for α amylase?
In Vitro α-Amylase Inhibitory Assay modified 3,5-dinitrosalicylic acid (DNS) method was adopted to estimate α-amylase inhibition activity, by quantifying the reducing sugar (maltose) liberated under the assay conditions. The enzyme inhibitory activity was expressed as a decrease in units of maltose liberated [8,9].
Are there any plant extracts that inhibit alpha amylase?
All the plant extracts exhibited a relative alpha-amylase inhibition apart from Strophanthus hispidus (SH) extract with a negative effect. We discovered a mild to weak correlation between alpha-amylase inhibition or antioxidative capacity and the total phenol or flavonoid content.