Pearl millet starch (Pennisetum typhoides) was isolated and subjected to hydrothermal, acidic and enzymatic modifications. Native and various modified starches were characterized in terms of yield, moisture, protein, ash, bulk density, swelling power, solubility, colour, sediment volume, gel consistency, water binding capacity, pasting properties, freeze thaw stability and paste clarity. Hydrothermal modification (HTMS) caused an increase in swelling power and solubility. L value was higher for acid and enzymatically modified starches (EMS). A significant reduction (p≤0.05) in sediment volume and water binding capacity was observed for acid modified starch (AMS) and EMS. Peak viscosity values declined for all modifications. However, EMS and AMS showed an improved freeze-thaw stability and paste clarity.

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Corrosion is a spontaneous process that adversely affects strength and quality of economically vital materials including steel. Plant extracts are emerging as renewable, low cost and eco-friendly alternate to existing toxic chemical corrosion inhibitors. Physisorption, Chemisorption and retrodonation are the main mechanism of corrosion inhibition by plant extracts. Different functional groups of phytochemicals namely carbohydrate, lipids, terpenoids, phenolic acids, alkaloids and other nitrogen containing metabolites participate in physisorption, chemisorption and retrodonation with steel surface in presence of HCl and H2SO4 to act as corrosion inhibitors. Exact mechanism of inhibition depends upon presence of such phytochemical in the plant extracts.

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