E.402

E.402
Name	E.402
Other names	Sorbitan monostearate
Formula	C24H46O6
Molar mass	430.62 g·mol−1
Appearance	yellowish to amber viscous liquid or waxy solid
Density	1.04 g/cm3
Melting point	51–57 °C
Solubility	insoluble in water; soluble in oils and organic solvents

E.402 is a food additive commonly known as sorbitan monostearate used as an emulsifier, stabilizer, and surfactant in processed foods and industrial formulations. It appears in formulations across the food, pharmaceutical, and cosmetic sectors and is associated with companies and institutions active in food ingredients, such as Unilever, Nestlé, PepsiCo, Kraft Foods Group, and regulatory authorities including European Food Safety Authority, U.S. Food and Drug Administration, and Food Standards Australia New Zealand. The compound is derived from sorbitol and stearic acid and is evaluated in risk assessments and codices such as the Codex Alimentarius.

Identification and Nomenclature

E.402 is listed in the Codex Alimentarius and the European Union list of food additives under the designation E 402; it is commonly referenced by the chemical name sorbitan monostearate and trade names used by manufacturers like Croda International, BASF, Dow Chemical Company, and Evonik Industries. Systematic nomenclature links to International Union of Pure and Applied Chemistry entries and monographs produced by bodies such as International Agency for Research on Cancer and pharmacopoeias like the British Pharmacopoeia and United States Pharmacopeia. It is categorized in additive inventories alongside related sorbitan esters such as sorbitan tristearate and polysorbates monitored by agencies including Joint FAO/WHO Expert Committee on Food Additives.

Chemical Composition and Properties

Chemically, sorbitan monostearate is an ester formed by partial dehydration of D-sorbitol (a sugar alcohol) followed by esterification with stearic acid (a long-chain fatty acid). The empirical formula C24H46O6 and molecular weight around 430.62 g·mol−1 reflect a mixture of positional isomers arising from monoesterification at different hydroxyl groups; analytical characterization employs techniques used by International Union of Pure and Applied Physics-aligned instrumentation standards such as gas chromatography, mass spectrometry, nuclear magnetic resonance, and infrared spectroscopy referenced in monographs from AOAC International. Physical properties include low water solubility, hydrophobic long-chain character, melting point typically 51–57 °C, and surfactant behavior characterized by hydrophilic–lipophilic balance values used in formulation science practiced by companies like Croda and consultancies such as IFF.

Food Additive Use and Functionality

In food technology, E.402 functions predominantly as an emulsifier, dispersing agent, and stabilizer in products manufactured by firms like General Mills, Mondelez International, Danone, Kellogg Company, and Mars, Incorporated. Typical applications include bakery products, confectionery, margarine, dairy analogues, sauces, and powdered mixes where it improves texture, extends shelf life, and enables oil–water mixing alongside other additives such as lecithin, mono- and diglycerides, and polysorbates used by Hormel Foods and Conagra Brands. Formulation scientists from institutions such as Nestlé Research Center and Campden BRI apply E.402 within recommended use levels listed by European Commission directives and incorporated into labeling practices overseen by agencies like Health Canada.

Safety, Toxicology, and Regulatory Status

Toxicological evaluation of sorbitan monostearate has been conducted by the Joint FAO/WHO Expert Committee on Food Additives and reviewed by the European Food Safety Authority; historical assessments by the U.S. Food and Drug Administration classify related sorbitan esters within allowable ingredient lists when meeting purity criteria. Acute toxicity studies, subchronic feeding trials, and genotoxicity screens reported in literature from universities and institutes such as Harvard School of Public Health, Imperial College London, and National Institutes of Health indicate low oral toxicity at typical dietary exposures. Regulatory limits, acceptable daily intake considerations, and usage permissions differ among jurisdictions including the European Union, United States, Japan, and Brazil; labeling obligations are enforced by national agencies like Food Standards Australia New Zealand and Mexican Federal Commission for the Protection against Sanitary Risk.

Production and Industrial Applications

Industrial production involves dehydration of sorbitol to sorbitan intermediates followed by esterification with stearic acid produced via hydrogenation of vegetable oils supplied by agribusinesses such as Cargill, Archer Daniels Midland, and Bunge Limited. Manufacturers include chemical companies like Croda International, BASF SE, and specialty ingredient firms such as Stepan Company. Beyond food, E.402 is used in pharmaceuticals (tabletting, suppositories) by companies like Pfizer and Johnson & Johnson, in cosmetics and personal care formulations by brands such as L'Oréal and Procter & Gamble, and in industrial lubricants, paints, and textile processing where surfactant properties are exploited.

Environmental Impact and Biodegradability

Environmental assessments performed by agencies including European Chemicals Agency and research groups at universities like ETH Zurich and University of California, Davis evaluate biodegradability, aquatic toxicity, and fate. Sorbitan monostearate is generally considered biodegradable under aerobic conditions and is subject to wastewater treatment pathways managed by municipal utilities and industrial pretreatment programs overseen by authorities such as Environmental Protection Agency; degradation products include sorbitan derivatives and fatty acids such as stearate that enter natural cycles. Lifecycle analyses conducted by firms like McKinsey & Company and sustainability frameworks from organizations like Roundtable on Sustainable Palm Oil inform sourcing of stearic feedstocks and assessments of ecological footprints.

Category:Food additives