Beta Lactose
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(β-D-Lactose), C12H22O11 342.30-White to faint yellow powder. The a--lactose content is not more than 35%.
Assay: Inject an appropriate derivatized specimen into a gas chromatograph (see Chromatography (621)) equipped with a flame-ionization detector, helium being used as the carrier gas. The following conditions have been found suitable: a 0.25-mm x 30-m capillary column coated with a 1-µm layer of phase G43; the injection port temperature is maintained at 250°; the detector temperature is maintained at 250°; the column temperature is maintained at 20° and programmed to rise 8" per minute to 280°. The area of the C12H22O11, peak is not less than 99% of the total peak area.
