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Anonymous users2024-02-111.The methods for determining the content of vitamin C in vitamin C tablets are: iodine measurement, ultraviolet spectrophotometry, colorimetry, thin-slice scanning method, differential polarimetric method and HPLC method2
A simple method: indirect iodine measurement method to determine the content of vitamin C: (1) Determination principle:
Under weakly acidic conditions, vitamin C undergoes redox reaction with iodine, and excess iodine is titrated with sodium thiosulfate standard. About the reaction equations: (2) Instruments and reagents:
Electronic balance: inductance standard solution, standard solution;
L-1Na2S2O3 standard solution.
3) Assay steps:
Accurately weigh the left and right samples in an iodine measuring flask, add 50ml of freshly boiled and cooled distilled water, and 5ml of glacial acetic acid to dissolve. Accurately pipette the iodine standard solution into an iodine measuring flask and shake well. Then the remaining iodine was titrated with the Na2S2O3 standard solution, and after titration until the solution was light yellow, the starch solution was added, and the titration was continued until the blue color just disappeared.
The volume consumed by the titration is recorded as the volume consumed according to the titration according to the following formula:
The indirect iodine dosing method was used to determine the content of vitamin C tablets, which did not require pretreatment of the sample, and had the advantages of simple operation, good precision and high accuracy.
Hope that helps, thanks.
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Anonymous users2024-02-10Vitamin C tablets.
Standard**. Drug Standards Database - Chinese Pharmacopoeia 2010 Edition, Part II.
Vitamin C tablets weishengsu
cpianvitamin
Ctablets This product contains vitamin C (C
SHS06) should be the labeled amount of 93
0%。【Properties】This product is white to slightly yellowish tablets.
Identification] (1) take an appropriate amount of fine powder of this product (about equivalent to vitamin C
Add 10ml of water, shake to dissolve vitamin C, filter, and the filtrate showed the same reaction according to the vitamin C identification (1) test. (2)
take an appropriate amount of fine powder of this product (
Approximately equivalent to saviso c
lomg), add 10ml of water, shake to dissolve vitamin C, filter, and take the filtrate as the test solution; Take vitamin C in addition
Reference, dissolved with water and diluted to make lml
Contains about LMG
as a control solution. Thin layer chromatography (Appendix V
b) Experiment, aspirate 2 FXL of each of the above two solutions
Respectively point 0&5 in the same silica gel
On thin layer plates, take ethyl acetate-ethanol-water (5
41) For the agent, dry, immediately (within 1 hour) under ultraviolet light (254nm) for inspection. The position and color of the main spot displayed by the test solution should be the same as that of the control solution.
Check] The color of the solution is taken as an appropriate amount of fine powder (
Equivalent to vitamin C
Add 20ml of water
Vitamin C is dissolved by shaking, filtered, and the filtrate is irradiated by UV-Vis spectrophotometry (Appendix WA).
The absorbance is measured at a wavelength of 440 nm and should not be overstated.
Meets the tablets. .
regulations. (Appendix.)
ia)。Content determination] take 20 tablets of this product, precision weighing, fine grinding, precision weighing appropriate amount (about equivalent to vitamin C
Put it in a 100ml measuring flask and add 100 fresh boiling cold water
ml with dilute acetic acid 10 m
l of the appropriate amount of mixture, shake to dissolve vitamin c and dilute to the scale, shake well, quickly filter, and take 50ml of filtrate accurately
Add 1 ml of starch indicator solution and immediately titrate with iodine titration solution (titration until the solution is blue and continue 3
0 seconds do not fade. per l
ml iodine titration solution (
5moll) is equivalent to.
6mg of csh80
Category: Same as vitamin <:.
Specification] (l) 25mg
2)50mg
3)100mg
4)250mg
Storage] shading, sealed storage.
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Anonymous users2024-02-09Hello! Each tablet has three specifications, such as 25mg, 50mg, 100mg, etc., and the vitamin C content of this product should be the labeled amount, such as 100mg tablets, the content should be between 93-107mg.
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