a.1.(Chem.) Of, pertaining to, or designating, any one of a series of acids regarded as acid ethereal salts of hyposulphurous acid; as, methyl sulphinic acid, CH3.SO.OH, a thick unstable liquid.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The authors suggested that for each mole of oxidized sulfur, there is the production of two equivalents of hydrogen ions, being the hydrogen source part of the methionine metabolism, generated by oxidation of cysteine into cysteine sulphinic acid and deamination or transamination of cysteine sulphinate into B-sulphinyl pyruvate.
(2) Oxidation/reduction in the presence of oxygen and its conversion into hydrogen thioperoxide and sulphenic, sulphinic, and sulphonic acids, where coenzyme Q-10 plays an important role [42].