Reconstruction
In 1838, Dutch chemist Gerardus Johannes Mulder gave a new name to a supposed common substance within many nitrogen-rich materials: protein. This was not the discovery of proteins as modern biochemistry understands them, nor a single experiment proving a fundamental nutrient. It was the culmination of several years of chemical analyses conducted while Mulder taught at Rotterdam’s Clinical School. His work nevertheless supplied food and physiological chemistry with a durable organizing category.
Mulder examined materials that crossed the boundary between laboratory specimen and food: egg albumin, blood serum and fibrin, gelatin, casein, and a preparation derived from wheat gluten. Through elemental analysis, he found broadly similar proportions of carbon, hydrogen, oxygen, and nitrogen, accompanied by varying amounts of sulfur and phosphorus. Working within the radical theory then influential in organic chemistry, he inferred that these substances contained the same sulfur-free chemical core. He believed sulfur and phosphorus were attached to that core in different combinations, producing the albuminous substances found in plants and animals.
The inferred universal core was incorrect. Proteins are not variations of one fixed radical but a vast family of macromolecules assembled from amino acids in differing sequences and structures. Yet the name survived the theory. On July 10, 1838, Swedish chemist Jöns Jacob Berzelius suggested “protein” to Mulder in correspondence, deriving it from the Greek proteios, meaning primary or of first rank. Berzelius considered the substance principal to animal nutrition and believed plants prepared it for herbivores, which then supplied carnivores.
Mulder introduced the word in publications appearing in Dutch and French during 1838; a German translation followed in 1839. The work linked apparently different foods and tissues—wheat gluten, milk curd, egg white, blood, and gelatin—through measurable chemical composition. It also encouraged chemists to treat nitrogenous food matter as a distinct subject of analysis. Later researchers overturned Mulder’s formula, separated individual proteins, identified amino acids, and established that dietary protein quality depends partly on amino-acid composition and digestibility.
The event’s lasting significance lies less in Mulder’s discarded molecular model than in the category he helped stabilize. Modern food labels, dietary guidelines, clinical nutrition, livestock feeding, and food-composition databases all quantify protein, although contemporary methods still require assumptions when converting measured nitrogen into protein. The familiar nutrient name therefore descends from an 1838 collaboration between experiment and correspondence: Mulder supplied the analytical theory, Berzelius proposed the terminology, and subsequent generations transformed an imperfect chemical hypothesis into a central concept of nutrition.
Historical context
Chemistry was being reorganized around elemental analysis, atomic formulas, and an expanding international correspondence network. Friedrich Wöhler’s 1828 synthesis of urea had challenged strict divisions between organic and inorganic matter, while Payen and Persoz identified the starch-digesting substance diastase in 1833. Vitamins, calories as routine dietary units, amino-acid requirements, and modern molecular structures were still unknown. Mulder worked at Rotterdam’s Clinical School and communicated with leading chemists abroad; he did not become professor at Utrecht University until 1840. Scientific journals enabled his protein theory to appear in Dutch and French in 1838 and in German translation in 1839.
Evidence
Written sources
StrongMulder’s 1838 Dutch and French publications and the 1839 German version document his analyses, proposed common radical, and use of the term protein. Later scholarship documents Berzelius’s July 10, 1838 letter proposing the word.
Dating
StrongThe word appeared in Mulder’s scientific publications during 1838; the relevant Berzelius letter is dated July 10, 1838. The German translation was published in 1839.
Preparation method
ModerateThe publications and historical analyses describe elemental analysis and chemical separation of albuminous materials. These were laboratory preparations and should not be equated with pure proteins as defined today.
Food identification
ModerateEgg albumin, casein, gelatin, blood constituents, and wheat-gluten-derived material are historically identifiable, but Mulder’s samples were heterogeneous preparations rather than single purified modern proteins.
Geographic attribution
StrongBiographical and historical sources place Mulder at the Clinical School in Rotterdam during the research and publication of 1838. His appointment at Utrecht University began in 1840.
Historical interpretation
ModerateThe naming of protein was highly influential, but describing the event as the establishment of a modern fundamental nutrient is partly retrospective. Mulder’s proposed universal protein radical was subsequently rejected.
Sources
- 1.Gerardus Johannes Mulder (1838). Sur la composition de quelques substances animales. Bulletin des sciences physiques et naturelles en Néerlande 1: 104–119. upload.wikimedia.org/wikipedia/commons/9/99/BullHistorical primary source
- 2.Gerardus Johannes Mulder (1839). Ueber die Zusammensetzung einiger thierischen Substanzen. Journal für praktische Chemie 16(1): 129–152. doi:10.1002/prac.18390160137Historical primary source
- 3.Hubert Bradford Vickery (1950). The Origin of the Word Protein. Yale Journal of Biology and Medicine 22(5): 387–393. pmc.ncbi.nlm.nih.gov/articles/PMC2598953/Scientific literature
- 4.Kenneth J. Carpenter (2000). Proteins. The Cambridge World History of Food. doi:10.1017/CHOL9780521402149.101Modern synthesis
- 5.Klaas van Berkel, Albert van Helden, and Lodewijk Palm, editors (1999). Gerardus Johannes Mulder, 1802–1880. A History of Science in the Netherlands: Survey, Themes and Reference. dwc.knaw.nl/wp-content/berkelbio/40.mulder.pdfModern synthesis
Limitations
- majorcoordinates
The supplied coordinates identify Utrecht, but Mulder conducted and published the relevant protein research while teaching at the Clinical School in Rotterdam. He joined Utrecht University only in 1840, two years after the event.
- moderatedescription
The description calls the evidence an archaeological synthesis, but the event is supported by publications, correspondence, and biographical records; no archaeological evidence is substantively relevant.
- minortitle
Calling protein a 'fundamental nutrient' uses modern nutritional language. Berzelius described it as principal to animal nutrition, but Mulder’s 1838 protein radical was an incorrect chemical model, and modern nutrient science developed later.
