Side Chain
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
This article defines the 'side chain' in organic chemistry as a carbon chain attached to a cyclic nucleus, such as an ethyl or propyl group in benzene derivatives. It then explains how Paul Ehrlich applied this chemical concept to immunology, proposing that plasma molecules carry specific chemical groupings called 'receptors' that can bind toxins and trigger antibody production.
Encyclopedia entry (1928–1936)
Side Chain, a term in organic chemistry for carbon chains attached to cyclic nuclei. For example, in ethyl- or propylbenzene (C6H5.C2H5)C6H5. .C3H7; the ethyl or propyl groups are side chains. Ehrlich used the chemical concept of a side chain as an analogy to explain the mechanism of immunity phenomena (see) — the 'side chain theory'. According to this theory, plasma molecules carry, as side chains, specific chemical groupings — 'receptors'. In the normal state, these receptors, in Ehrlich's opinion, participate in the processes of cell nutrition; in the case of their binding by certain poisons, compensatory overproduction of them begins; the excessively formed side chains are rejected from the cell, enter the blood, and here perform the role of antibodies (see).
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“Side Chain.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/side-chain/