Sodium Gluconate
(soe' dee um gloo' koe nate).
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C6H11NaO7 218.14
d-Gluconic acid, monosodium salt;    
Monosodium d-gluconate     [527-07-1].
Sodium Gluconate contains NLT 98.0% and NMT 102.0% of C6H11NaO7.
•  A. Identification Tests—General, Sodium 191
Sample solution:  1 in 20
Acceptance criteria:  Meets the requirements
•  B. Thin-Layer Chromatography
Standard solution:  10 mg/mL of USP Potassium Gluconate RS in water. [Note—Heat in a water bath at 60 if necessary to dissolve. ]
Sample solution:  10 mg/mL of Sodium Gluconate in water. [Note—Heat in a water bath at 60 if necessary to dissolve. ]
Chromatographic system 
Mode:  TLC
Adsorbent:  0.25-mm layer of chromatographic silica gel
Application volume:  5 µL
Developing solvent system:  Alcohol, ethyl acetate, ammonium hydroxide, and water (50:10:10:30)
Spray reagent:  Dissolve 2.5 g of ammonium molybdate in 50 mL of 2 N sulfuric acid in a 100-mL volumetric flask, add 1.0 g of ceric sulfate, swirl to dissolve, and dilute with 2 N sulfuric acid to volume.
Samples:  Standard solution and Sample solution
Develop in the Developing solvent system until the solvent front has moved three-fourths of the length of the plate. Remove the plate from the chamber, and dry at 110 for 20 min. Allow to cool and spray with the Spray reagent. Heat the plate at 110 for 10 min.
Acceptance criteria:  The principal spot from the Sample solution corresponds in color, size, and RF value to that from the Standard solution.
•  Procedure
Sample:  150 mg
Analysis:  Transfer the Sample to a suitable conical flask and dissolve in 75 mL of glacial acetic acid, warming if necessary to dissolve. Cool, add quinaldine red TS, and titrate with 0.1 N perchloric acid VS to a colorless endpoint. Each mL of 0.1 N perchloric acid is equivalent to 21.81 mg of C6H11NaO7.
Acceptance criteria:  98.0%–102.0%
•  Chloride and Sulfate, Chloride 221
Sample:  1.0 g
Acceptance criteria:  The Sample shows no more chloride than corresponds to 1 mL of 0.020 N hydrochloric acid (NMT 0.07%).
•  Chloride and Sulfate, Sulfate 221
Sample:  2.0 g
Acceptance criteria:  The Sample, dissolved in boiling water, shows no more sulfate than corresponds to 1 mL of 0.020 N sulfuric acid (NMT 0.05%).
•  Lead 251
Test preparation:  1.0 g in 25 mL of water
Acceptance criteria:  NMT 10 ppm
•  Heavy Metals, Method I 231
Test preparation:  Dissolve 1.0 g in 10 mL of water, add 6 mL of 3 N hydrochloric acid, and dilute with water to 25 mL.
Acceptance criteria:  NMT 20 ppm
•  Reducing Substances
Sample:  1.0 g
Analysis:  Transfer the Sample to a 250-mL conical flask, dissolve in 10 mL of water, and add 25 mL of alkaline cupric citrate TS. Cover the flask, boil gently for 5 min, accurately timed, and cool rapidly to room temperature. Add 25 mL of 0.6 N acetic acid, 10.0 mL of 0.1 N iodine VS, and 10 mL of 3 N hydrochloric acid, and titrate with 0.1 N sodium thiosulfate VS, adding 3 mL of starch TS as the endpoint is approached. Perform a blank determination, omitting the specimen, and note the difference in volumes required (see Titrimetry 541). Each mL of the difference in volume of 0.1 N sodium thiosulfate consumed is equivalent to 2.7 mg of reducing substances (as dextrose).
Acceptance criteria:  NMT 0.5%
•  Packaging and Storage: Preserve in well-closed containers.
•  USP Reference Standards 11
USP Potassium Gluconate RS Click to View Structure
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Elena Gonikberg, Ph.D.
Principal Scientific Liaison
(SM32010) Monographs - Small Molecules 3
Reference Standards RS Technical Services
USP35–NF30 Page 4661