periodate, per-iodate Chem.
(pəˈraɪədeɪt)
[See per- 5.]
A salt of periodic acid. (In Pharmacy, short for calcium periodate, an antiseptic.) periodic acid-Schiff (Biol.), phr. used attrib. and absol. to designate a procedure for the detection of carbohydrates by first oxidizing them to polyaldehydes with periodic acid and then staining with Schiff's reagent.
| 1836 Brande Chem. (ed. 4) 343 A sparingly soluble white salt is obtained, which is a periodate of soda. 1871 Roscoe Elem. Chem. 122 Periodic Acid, or Hydrogen Periodate. 1890 Pall Mall G. 6 Jan. 2/3 A medical contemporary mentioned that one sniff of periodate crystals would cure an attack of influenza. 1892 Times 28 Oct. 3/5 It is claimed that in the early stage of cholera periodate is successful in 95 per cent of the cases. 1947 Jrnl. Laboratory & Clin. Med. XXXII. 911 McManus reported the use of a periodic acid-Schiff technique for the demonstration of mucin. 1956 Nature 3 Mar. 432/2 Secretory inclusions which are positive to the periodic-acid-Schiff test are conspicuous in the non-ciliated iodine-binding cells of the endostyle of Ciona. 1960 E. Gurr Encycl. Microsc. Stains i. 274 The author describes..results obtained with silver staining and periodic acid-Schiff. 1974 H. C. Cook Man. Histol. Demonstr. Techniques i. 16 They [sc. basement membranes] may be demonstrated..by the periodic acid-Schiff (PAS) technique and a variant of this, the Allochrome method. |
So periodic, per-iodic (pɜːraɪˈɒdɪk) a., as in periodic acid, H5IO6, an acid containing a larger proportion of oxygen than iodic acid; peˈriodide or † periˈoduret, a combination of iodine with another element or radical in a larger proportion than in a simple iodide.
| 1819 Brande Chem. 138 Periodide of phosphorus is a black compound, formed by heating one part of iodine with rather more than 20 of phosphorus. 1836 Ibid. (ed. 4) 343 An aqueous solution of pure periodic acid is formed. 1853 W. Gregory Inorg. Chem. 117 Periodic Acid. IO7 = 183·1. Analogous to perchloric acid. 1857 Mayne Expos. Lex. 912/1 Perioduret. 1897 Allbutt's Syst. Med. II. 742 One sixteenth of a grain of periodide [i.e. of mercury] or of corrosive sublimate. |