Liquid Glucose
Add the following:
» Liquid Glucose is a product obtained by the incomplete hydrolysis of starch. It consists chiefly of dextrose, dextrins, maltose, and water.
Change to read:
Packaging and storage— Preserve in tightly closed containers. No storage requirements specified.NF27
Add the following:
Labeling— Label it to indicate the natural source of starch. Label it to indicate its nominal dextrose equivalent.NF27
Add the following:
USP Reference standards 11
USP Dextrose RS Click to View Structure .
Change to read:
Identification— It meets the requirements of the Assay for reducing sugars (dextrose equivalent).NF27
Acidity— To a solution of 5.0 g in 15 mL of water add 5 drops of phenolphthalein TS: not more than 0.60 mL of 0.10 N sodium hydroxide is required to produce a pink color.
Water, Method Ia 921: not more than 21.0%, determined on a 100-mg specimen.
Residue on ignition 281: not more than 0.5%.
Sulfite— Dissolve 5 g in 50 mL of water, add 0.2 mL of 0.1 N iodine, then add 0.5 mL of starch TS: a blue color is produced.
Heavy metals 231 Mix 2.0 g with water to make 25 mL: the limit is 0.001%.
Starch— Dissolve 5 g in 50 mL of water, boil the solution for 1 minute, cool, and add 0.2 mL of 0.1 N iodine: no blue color is produced.
Add the following:
Assay for reducing sugars (dextrose equivalent)—
Standard solution— Dissolve an accurately weighed quantity of USP Dextrose RS in water, and dilute quantitatively with water to obtain a solution having a known concentration of about 6 mg per mL.
Test solution— Transfer a quantity of Liquid Glucose, equivalent to about 3.0 g of reducing sugars (dextrose equivalent), to a 500-mL volumetric flask, dilute with water to volume, and mix.
Procedure— Transfer 25.0-mL portions of alkaline cupric tartrate TS to each of two boiling flasks. Bring the contents of one flask to boiling within about 2 minutes while titrating with Standard solution to within 0.5 mL of the anticipated endpoint. Boil gently for 2 minutes. Continue to boil gently, add 2 drops of methylene blue solution (1 in 100), and complete the titration within 1 minute by adding the Standard solution dropwise or in small increments until the blue color disappears, determined by viewing against a white background in daylight or under equivalent illumination. If more than 0.5 mL of the titrant was required after the addition of the indicator, repeat the titration, adding the necessary volume of titrant before adding the indicator. Bring the contents of the second flask to boiling, and similarly titrate with the Test solution. Calculate the dextrose equivalent, on the anhydrous basis, taken by the formula:
[100 / (1 – 0.01A)] (500)(CS / W)(VS / VU)
in which A is the percentage Water of the Liquid Glucose taken; 500 is the volume, in mL, of the Test solution; W is the weight, in mg, of Liquid Glucose taken to prepare the Test solution; CS is the concentration, in mg per mL, of USP Dextrose RS in the Standard solution; and VU and VS are the titrated volumes, in mL, of the Test solution and the Standard solution, respectively. The dextrose equivalent is not less than 90% and not more than 110% of the labeled value.NF27
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Hong Wang, Ph.D.
(EM205) Excipient Monographs 2
Reference Standards Lili Wang, Technical Services Scientist
USP32–NF27 Page 1242
Pharmacopeial Forum: Volume No. 33(6) Page 1248
Chromatographic Column—
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.