C.06.230. to C.06.233. [Repealed, SOR/80-544, s. 12]
C.06.240. to C.06.242. [Repealed, SOR/80-544, s. 12]
C.06.250. Thyroid shall be the cleaned, dried, powdered thyroid glands of domestic animals used for food, and shall contain not less than 0.17 per cent, and not more than 0.23 per cent iodine and no added iodine in either inorganic or organic form, and
(a) its characters are
(i) General, — thyroid occurs as a cream-coloured, amorphous powder; the odour and taste are faint and meat-like, and
(ii) Microscopical, — when suitably mounted and examined under the microscope, thyroid shows the following: numerous smooth to striated hyaline fragments of colloids, of angular to irregular shape, that are colourless to pale yellow in water mounts, brown in Mallory’s stain and pink in solution of eosin, some of these fragments containing granules, minute vacuoles, crystalloidal bodies and cells; numerous irregular fragments of follicular epithelium staining brown with Mallory’s stain, the individual cells more or less polygonal to rounded-angular or irregularly cuboidal, often with prominent nuclei staining dark blue, their cytoplasm purplish with Delafield’s solution of haematoxylin; slender glistening segments of capillaries of closely undulate outline; numerous slender segments of neuraxons; numerous aggregates of particles of intercellular substance and slender, mostly straight connective tissue fibres staining blue to greenish blue with a mixture of Mallory’s stain and solution of phosphotungstic acid, the bundles of fibres often appearing reddish in Mallory’s stain; few glistening fragments of blood vessels with serrated or crenated ends as viewed in water mounts; and
(b) the tests for its purity are
(i) Inorganic iodine, — add to one gram of thyroid 10 millilitres of a saturated solution of zinc sulphate in water, shake, allow to stand five minutes, and filter through a fritted glass filter; add to five millilitres of the filtrate 0.5 millilitre of mucilage of starch and four drops each of a 10 per cent w/v solution of sodium nitrite in water and dilute sulphuric acid, shaking after each addition: no blue colour is produced, and
(ii) Moisture, — thyroid loses not more than six per cent moisture.
C.06.251. Thyroid shall be
(a) assayed by official method DO-26, Thyroid, October 15, 1981; and
(b) stored in a cool place and in a tightly-closed container.
- SOR/82-429, s. 8.
C.06.252. [Repealed, SOR/80-544, s. 12]
C.06.260. to C.06.264. [Repealed, SOR/80-544, s. 12]
C.06.270. to C.06.280. [Repealed, SOR/80-544, s. 12]
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