Why industrial waste might be the secret to better, more sustainable hand sanitizer

Health · Published 3 October 2026 Swipe more like this →

In short: Hand sanitizer is a staple of modern hygiene, but its production often relies on virgin ingredients. Recent research suggests that crude glycerol, a byproduct of industrial processes like biodiesel manufacturing, can be purified and repurposed to create effective, high-viscosity gels that are both sustainable and gentle on the skin.

Hand sanitizer, or hand antiseptic, serves as a vital tool for killing microorganisms when soap and water are unavailable. While alcohol-based versions—typically containing 60% to 95% ethanol or isopropyl alcohol—are the gold standard for healthcare settings, they are not universal panaceas. They struggle against spores, norovirus, and Clostridioides difficile, and their efficacy drops significantly if hands are visibly soiled, greasy, or slimy.

To improve the user experience and prevent the skin dryness associated with frequent use, manufacturers often add humectants like glycerol. A recent study explored a more circular approach by purifying crude glycerol—a byproduct of industrial biodiesel production—using chemical treatments and activated charcoal. This purified glycerol was successfully integrated into a hand sanitizer formulation alongside water, hydroxyethylcellulose, and methylparaben-ethanol. The resulting gel maintained a slightly acidic pH of 5.7 and demonstrated excellent spreadability despite its high viscosity.

The science of sanitization is precise. Alcohol works by denaturing proteins and lysing cells, a process that requires sufficient exposure time—at least 10 to 15 seconds—and adequate concentration. If the alcohol content falls below 60%, or if the volume applied is too low, the sanitizer fails to perform its job. Furthermore, the addition of ingredients like methyl salicylate, which can be aggregated at concentrations up to 50%, opens new doors for designing formulations with specific biological activities. By turning industrial waste into high-quality ingredients, researchers are proving that the future of hygiene may lie in better resource management.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Can alcohol-based hand sanitizers lead to the rise of superbugs?
• Soap or hand sanitizer: which is more effective at stopping a virus?
• Why this common household solvent is a secret weapon for DNA and solar cells
• Beyond the bottle: How alcohol serves as a versatile tool in modern medicine
• The sweet, viscous liquid that once served as a vital wartime defense priority
• A hazard is only a threat if you are standing in its way
• Can laboratory testing finally prove if your hair care products actually work as promised?
• From French Strongman Gyms to Modern Wellness Hubs: The Evolution of the Health Club
• Frailty is not just aging: it is a measurable, preventable loss of physiological resilience.
• What actually constitutes a healthy diet, according to global health experts?
• Why your body needs this essential B vitamin to build DNA and stay healthy
• For centuries, humans and animals have shared the intimate, life-sustaining act of breastfeeding.

More in Health and fitness · More in Health · Latest · A–Z · All topics