Riboflavin Tablets
DEFINITION
Riboflavin Tablets contains NLT 95.0% and NMT 115.0% of the labeled amount of riboflavin (C17H20N4O6).
ASSAY
• Riboflavin Assay 
481
481 Assay preparation: Transfer a portion of the powder from NLT 20 finely powdered Tablets, equivalent to 20 mg of riboflavin, to a 250-mL flask, and add 150 mL of 0.1 N hydrochloric acid. Shake vigorously, and wash down the sides of the flask with sufficient 0.1 N hydrochloric acid to ensure that the pH remains below 1.5 during the subsequent period of heating. Heat the mixture on a steam bath, with frequent agitation, until the riboflavin has dissolved, or in an autoclave at 121
for 30 min. Cool, and with vigorous agitation, adjust the mixture with 1 N sodium hydroxide to a pH of 5–6. Transfer to a 1000-mL volumetric flask, and dilute with water to volume. If the solution is not clear, filter through paper known not to adsorb riboflavin. Dilute an aliquot of the clear solution with water to a final volume that contains 0.1 µg/mL of riboflavin.
for 30 min. Cool, and with vigorous agitation, adjust the mixture with 1 N sodium hydroxide to a pH of 5–6. Transfer to a 1000-mL volumetric flask, and dilute with water to volume. If the solution is not clear, filter through paper known not to adsorb riboflavin. Dilute an aliquot of the clear solution with water to a final volume that contains 0.1 µg/mL of riboflavin.Analysis: Proceed as directed in the chapter.
Calculate the percentage of the labeled amount of riboflavin (C17H20N4O6) in the portion of Tablets taken:
Result = (IU/IS) × (CS/CU) × 100
| IU | = | = corrected fluorescence value from the Assay preparation |
| IS | = | = corrected fluorescence value from the Standard Preparation |
| CS | = | = concentration of USP Riboflavin RS in the Standard Preparation (µg/mL) |
| CU | = | = nominal concentration of riboflavin in the Assay preparation (µg/mL) |
Acceptance criteria: 95.0%–115.0%
PERFORMANCE TESTS
• Dissolution 711
711 Medium: Water; 900 mL
Apparatus 2: 50 rpm
Time: 45 min
Standard solution: Known concentration of USP Riboflavin RS in Medium
Sample solution: Filtered portion of the solution under test, suitably diluted with the Medium if necessary
Mobile phase: A mixture of methanol, glacial acetic acid, and water (27:1:73) containing 1.40 mg/mL of sodium 1-hexanesulfonate
Chromatographic system
Mode: LC
Detector: UV 280 nm
Column: 3.9-mm × 30-cm; packing L1
Flow rate: 1 mL/min
Injection size: 10 µL
System suitability
Sample: Standard solution
Suitability requirements
Relative standard deviation: NMT 3.0%
Analysis
Samples: Standard solution and Sample solution
Calculate the percentage of the labeled amount of riboflavin (C17H20N4O6) dissolved:
Result = (rU/rS) × (CS × D × V/L) × 100
| rU | = | = peak area of riboflavin from the Sample solution |
| rS | = | = peak area of riboflavin from the Standard solution |
| CS | = | = concentration of USP Riboflavin RS in the Standard solution (mg/mL) |
| D | = | = dilution factor for the Sample solution |
| V | = | = volume of Medium, 900 mL |
| L | = | = label claim (mg/Tablet) |
Tolerances: NLT 75% (Q) of the labeled amount of riboflavin (C17H20N4O6) is dissolved.
• Uniformity of Dosage Units 905: Meet the requirements
905: Meet the requirementsADDITIONAL REQUIREMENTS
• Packaging and Storage: Preserve in tight, light-resistant containers.
• USP Reference Standards 11
11 USP Riboflavin RS 
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Auxiliary Information— Please check for your question in the FAQs before contacting USP.
| Topic/Question | Contact | Expert Committee |
|---|---|---|
| Monograph | Natalia Davydova Scientific Liaison 1-301-816-8328 | (DS2010) Monographs - Dietary Supplements |
| 711 | Margareth R.C. Marques, Ph.D. Senior Scientific Liaison 1-301-816-8106 | (GCDF2010) General Chapters - Dosage Forms |
| Reference Standards | RS Technical Services 1-301-816-8129 rstech@usp.org |
USP35–NF30 Page 4547