Propionic acid, known by its CAS number 79-09-4 and also as propanoic acid, serves as the precursor for a range of valuable derivatives, most notably its esters and salts. These compounds, often referred to as propionates or propanoates, inherit some of the parent acid's functional properties while offering unique characteristics that expand their applicability across industries. The propionic acid esters and salts are crucial in various sectors due to their distinct properties.

Propionic acid esters, formed through esterification reactions, often possess fruity aromas and are utilized as artificial flavorings in the food industry and as solvents in various applications. For instance, ethyl propionate and methyl propionate are common examples used in flavor formulations. These are often sought after by consumers searching for 'artificial flavorings derived from propionic acid'.

The salts of propionic acid, such as sodium propionate, calcium propionate, and ammonium propionate, are extensively used as preservatives. Sodium and calcium propionate are particularly vital in the baking industry and as food preservatives, inhibiting mold growth and extending the shelf life of bread and other baked goods. Ammonium propionate is often employed as a propionic acid preservative for animal feed. The efficacy of these propionate salts underscores the broad spectrum of propionic acid industrial uses.

The chemical production of propionic acid directly influences the availability and cost-effectiveness of these derivatives. While understanding the safety of propionic acid handling is crucial for the parent compound, the derivatives also require appropriate handling protocols. The development of new applications for propionic acid esters and salts continues, driven by their versatility and proven effectiveness in diverse fields ranging from agriculture to specialized chemical synthesis.