{"id":2810,"date":"2025-09-22T15:40:09","date_gmt":"2025-09-22T08:40:09","guid":{"rendered":"https:\/\/nhathuocngocanh.com\/bp\/?p=2810"},"modified":"2025-10-02T14:00:17","modified_gmt":"2025-10-02T07:00:17","slug":"benzylpenicillin-sodium","status":"publish","type":"post","link":"https:\/\/nhathuocngocanh.com\/bp\/benzylpenicillin-sodium\/","title":{"rendered":"Benzylpenicillin Sodium"},"content":{"rendered":"

(Ph. Eur. monograph 0114)<\/p>\n

C16<\/sub>H17<\/sub>N2<\/sub>NaO4<\/sub>S\u00a0 \u00a0 356.4\u00a0 \u00a0 69-57-8<\/p>\n

Action and use<\/strong><\/p>\n

Penicillin antibacterial.<\/p>\n

Preparations<\/p>\n

Benzylpenicillin Eye Drops<\/p>\n

Benzylpenicillin for Injection<\/p>\n

Benzylpenicillin Infusion<\/p>\n

DEFINITION<\/h2>\n

Sodium (2S,5R,6R)-3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate.<\/p>\n

Substance produced by the growth of certain strains of Penicillium notatum or related organisms.<\/p>\n

Content<\/h3>\n

95.0 per cent to 102.0 per cent (dried substance).<\/p>\n

CHARACTERS<\/h2>\n

Appearance<\/h3>\n

White or almost white, hygroscopic, crystalline powder.<\/p>\n

Solubility<\/h3>\n

Very soluble in water, slightly soluble in ethanol (96 per cent), practically insoluble in methylene chloride.<\/p>\n

IDENTIFICATION<\/h2>\n

First identification: A, D.<\/p>\n

Second identification: B, C, D.<\/p>\n

A. Infrared absorption spectrophotometry (2.2.24).<\/p>\n

Comparison benzylpenicillin sodium CRS.<\/p>\n

B. Thin-layer chromatography (2.2.27).<\/p>\n

Test solution: Dissolve 25 mg of the substance to be examined in 5 mL of water R.<\/p>\n

Reference solution: (a) Dissolve 25 mg of benzylpenicillin sodium CRS in 5 mL of water R.<\/p>\n

Reference solution: (b) Dissolve 25 mg of benzylpenicillin sodium CRS and 25 mg of\u00a0 phenoxymethylpenicillin potassium CRS in 5 mL of water R.<\/p>\n

Plate: TLC silanised silica gel plate R.<\/p>\n

Mobile phase: Mix 30 volumes of acetone R and 70 volumes of a 154 g\/L solution of ammonium acetate R previously adjusted to pH 5.0 with glacial acetic acid R.<\/p>\n

Application 1 \u03bcL.<\/p>\n

Development: Over 2\/3 of the plate.<\/p>\n

Drying: In air.<\/p>\n

Detection: Expose to iodine vapour until the spots appear and examine in daylight.<\/p>\n

System suitability: Reference solution (b):<\/p>\n

\u2014 the chromatogram shows 2 clearly separated spots.<\/p>\n

Results: The principal spot in the chromatogram obtained with the test solution is similar in position, colour and size to the principal spot in the chromatogram obtained with reference solution (a).<\/p>\n

C. Place about 2 mg in a test-tube about 150 mm long and 15 mm in diameter. Moisten with 0.05 mL of water R and add 2 mL of sulfuric acid-formaldehyde reagent R. Mix the contents of the tube by swirling; the solution is practically colourless. Place the test-tube on a water-bath for 1 min; a reddish-brown colour develops.<\/p>\n

D. It gives reaction (a) of sodium (2.3.1).<\/p>\n

TESTS<\/h2>\n

pH (2.2.3)<\/h3>\n

5.5 to 7.5.<\/p>\n

Dissolve 2.0 g in carbon dioxide-free water R and dilute to 20 mL with the same solvent.<\/p>\n

Appearance of solution<\/h3>\n

The solution is clear (2.2.1).<\/p>\n

Dissolve 3.0 g in water R and dilute to 10 mL with the same solvent.<\/p>\n

Related substances<\/h3>\n

Liquid chromatography (2.2.29). Prepare the solutions immediately before use.<\/p>\n

Test solution (a): Dissolve 50.0 mg of the substance to be examined in water R and dilute to 50.0 mL with the same solvent.<\/p>\n

Test solution (b): Dissolve 80.0 mg of the substance to be examined in water R and dilute to 20.0 mL with the same solvent.<\/p>\n

Reference solution (a): Dissolve 50.0 mg of benzylpenicillin sodium CRS in water R and dilute to 50.0 mL with the same solvent.<\/p>\n

Reference solution (b): Dissolve 5 mg of benzylpenicillin for system suitability CRS (containing impurities A, B, C, D, E, F, G and H) in 0.35 mL of methanol R1 and add 0.65 mL of water R.<\/p>\n

Reference solution (c): Dilute 1.0 mL of test solution (b) to 100.0 mL with water R.<\/p>\n

Reference solution (d): Dilute 1.0 mL of reference solution (c) to 20.0 mL with water R.<\/p>\n

Column:<\/p>\n

\u2014 size: l = 0.15 m, \u00d8 = 4.6 mm;<\/p>\n

\u2014 stationary phase: end-capped octadecylsilyl silica gel for chromatography R (3 \u03bcm);<\/p>\n

\u2014 temperature: 50 \u00b0C.<\/p>\n

Mobile phase:<\/p>\n

\u2014 mobile phase A: mix 10 volumes of a 68 g\/L solution of potassium dihydrogen phosphate R adjusted to pH 3.4 with a 500 g\/L solution of phosphoric acid R, 30 volumes of methanol R1 and 60 volumes of water for chromatography R;<\/p>\n

\u2014 mobile phase B: mix 10 volumes of a 68 g\/L solution of potassium dihydrogen phosphate R adjusted to pH 3.4 with a 500 g\/L solution of phosphoric acid R, 35 volumes of water for chromatography R and 55 volumes of methanol R1;<\/p>\n\n\n\n\n\n\n
Time
\n(min)<\/td>\n		Mobile phase A
\n(per cent V\/V)<\/td>\n		Mobile phase B
\n(per cent V\/V)<\/td>\n<\/tr>\n
0 – 7<\/td>\n70<\/td>\n30<\/td>\n<\/tr>\n
7 – 17<\/td>\n\u00a070 \u2192 0<\/td>\n30 \u2192 100<\/td>\n<\/tr>\n
17 – 22<\/td>\n0<\/td>\n100<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Flow rate: 1.5 mL\/min.<\/p>\n

Detection: Spectrophotometer at 225 nm.<\/p>\n

Injection: 20 \u03bcL of test solution (b) and reference solutions (b), (c) and (d).<\/p>\n

Identification of impurities: Use the chromatogram supplied with benzylpenicillin for system suitability CRS and the chromatogram obtained with reference solution (b) to identify the peaks due to impurities A, B, C, D, E, F, G and H.<\/p>\n

Relative retention: With reference to benzylpenicillin (retention time = about 7 min): impurity A = about 0.22; impurity D = about 0.33; impurity C = about 0.35; impurity E = about 0.48 and 0.55; impurity B = about 0.62; impurity F = about 0.81 and 0.83; impurity G = about 1.47; impurity H = about 1.90.<\/p>\n

System suitability:<\/p>\n

\u2014 resolution: minimum 1.2 between the peaks due to the epimers of impurity F and minimum 1.5 between the peaks due to impurities D and C in the chromatogram obtained with reference solution (b);<\/p>\n

\u2014 signal-to-noise ratio: minimum 20 for the principal peak in the chromatogram obtained with reference solution (d).<\/p>\n

Calculation of percentage contents:<\/p>\n

\u2014 correction factors: multiply the peak areas of the following impurities by the corresponding correction factor: impurity A = 1.3; impurity D = 0.6; impurity E = 2.0; impurity F = 1.7;<\/p>\n

\u2014 for each impurity, use the concentration of benzylpenicillin sodium in reference solution (c).<\/p>\n

Limits:<\/p>\n

\u2014 impurity E: maximum 2.0 per cent for the sum of the isomers;<\/p>\n

\u2014 impurity F: maximum 1.0 per cent for the sum of the 2 epimers;<\/p>\n

\u2014 impurity B: maximum 0.5 per cent;<\/p>\n

\u2014 impurities A, C, D, G, H: for each impurity, maximum 0.2 per cent;<\/p>\n

\u2014 any other impurity: for each impurity, maximum 0.2 per cent;<\/p>\n

\u2014 total: maximum 3.0 per cent;<\/p>\n

\u2014 reporting threshold: 0.05 per cent.<\/p>\n

2-Ethylhexanoic acid (2.4.28)<\/p>\n

Maximum 0.5 per cent m\/m.<\/p>\n

Loss on drying (2.2.32)<\/h4>\n

Maximum 1.0 per cent, determined on 1.000 g by drying in an oven at 105 \u00b0C.<\/p>\n

ASSAY<\/h2>\n

Liquid chromatography (2.2.29) as described in the test for related substances with the following modifications.<\/p>\n

Mobile phase Mobile phase A, mobile phase B (70:30 V\/V).<\/p>\n

Flow rate 1.2 mL\/min.<\/p>\n

Injection 10 \u03bcL of test solution (a) and reference solution (a).<\/p>\n

Calculate the percentage content of C16<\/sub>H17<\/sub>N2<\/sub>NaO4<\/sub>S taking into account the assigned content of benzylpenicillin sodium CRS.<\/p>\n

STORAGE<\/h2>\n

In an airtight container. If the substance is sterile, the container is also sterile and tamper-evident.<\/p>\n

IMPURITIES<\/h2>\n

Specified impurities A, B, C, D, E, F, G, H.<\/p>\n

\"Benzylpenicillin<\/p>\n

A. (2S,5R,6R)-6-amino-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (6-aminopenicillanic acid),<\/p>\n

\"Benzylpenicillin<\/p>\n

B. phenylacetic acid,<\/p>\n

\"Benzylpenicillin<\/p>\n

C. (2S,5R,6R)-6-[[(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,<\/p>\n

\"Benzylpenicillin<\/p>\n

D. (3S,7R,7aR)-5-benzyl-2,2-dimethyl-2,3,7,7a-tetrahydroimidazo[5,1-b]thiazole-3,7-dicarboxylic acid (penillic acid of benzylpenicillin),<\/p>\n

\"Benzylpenicillin<\/p>\n

E. (4S)-2-[carboxy[(phenylacetyl)amino]methyl]-5,5-dimethylthiazolidine-4-carboxylic acid (penicilloic acids of benzylpenicillin),<\/p>\n

\"Benzylpenicillin<\/p>\n

F. (2RS,4S)-5,5-dimethyl-2-[[(phenylacetyl)amino]methyl]thiazolidine-4-carboxylic acid (penilloic acids of benzylpenicillin),<\/p>\n

\"Benzylpenicillin<\/p>\n

G. (2S,5R,6R)-6-[(3Z)-hex-3-enoylamino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (iso-penicillin F),<\/p>\n

\"Benzylpenicillin<\/p>\n

H. (2S,5R,6R)-6-(hexanoylamino)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
\n(dihydropenicillin F).<\/p>\n","protected":false},"excerpt":{"rendered":"

(Ph. Eur. monograph 0114) C16H17N2NaO4S\u00a0 \u00a0 356.4\u00a0 \u00a0 69-57-8 Action and use Penicillin antibacterial. Preparations Benzylpenicillin Eye Drops Benzylpenicillin for Injection Benzylpenicillin Infusion DEFINITION Sodium (2S,5R,6R)-3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate. Substance produced by the growth of certain strains of Penicillium notatum or related organisms. Content 95.0 per cent to 102.0 per cent (dried substance). CHARACTERS Appearance White or almost…<\/p>\n","protected":false},"author":3,"featured_media":2848,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[174],"tags":[],"class_list":["post-2810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medicinal-substances"],"acf":[],"_links":{"self":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/2810","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/comments?post=2810"}],"version-history":[{"count":5,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/2810\/revisions"}],"predecessor-version":[{"id":7824,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/2810\/revisions\/7824"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/media\/2848"}],"wp:attachment":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/media?parent=2810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/categories?post=2810"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/tags?post=2810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}