What is the composition of sanitizer

 

WHO offers two simple formulations for making our own hand-sanitizing liquids in resource-limited or remote areas where workers don’t have access to sinks or other hand-cleaning facilities. One of these formulations uses 80% ethanol, and the other, 75% isopropyl alcohol, otherwise known as rubbing alcohol. Both recipes contain a small amount of hydrogen peroxide to prevent microbes from growing in the sanitizer dispenser and a bit of glycerol to help moisturize skin and prevent dermatitis. Other moisturizing compounds we might find in liquid hand sanitizers include poly (ethylene glycol) and propylene glycol. When an alcohol-based hand sanitizer is rubbed into the skin, its ethanol evaporates, leaving behind these soothing compounds.


In clinics, runny, liquid hand sanitizers like those you can make from the WHO recipes are easily transferred to the hands of patients, doctors, and visitors from wall-mounted dispensers. For consumers, hand sanitizer gels are a lot easier to carry and dispense on the go because it’s easier to squeeze a gel from the bottle of automatic soap dispensers without spilling it everywhere. Gels also slow the evaporation of alcohol, ensuring it has time to cover our hands and work against the microbes that might be present. People who have tried to make their own gel-based hand sanitizers can tell you that classic gelling agents like gelatin or agar won’t behave when mixed with the high concentrations of alcohol that we need to kill viruses and bacteria. These agents won’t form a gel that’s stable because polar alcohol groups interrupt the intermolecular bonds. Manufacturers get around this obstacle by using high-molecular-weight cross-linked polymers of acrylic acid.

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