{"id":13338,"date":"2025-10-13T14:29:04","date_gmt":"2025-10-13T07:29:04","guid":{"rendered":"https:\/\/nhathuocngocanh.com\/bp\/?p=13338"},"modified":"2025-10-13T16:39:23","modified_gmt":"2025-10-13T09:39:23","slug":"glycerol-monolinoleate","status":"publish","type":"post","link":"https:\/\/nhathuocngocanh.com\/bp\/glycerol-monolinoleate\/","title":{"rendered":"Glycerol Monolinoleate"},"content":{"rendered":"

(Ph. Eur. monograph 1429)<\/p>\n

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

Excipient.<\/p>\n

DEFINITION<\/h2>\n

Mixture of monoacylglycerols, mainly mono-oleoyl- and monolinoleoylglycerol, together with variable quantities of di- and triacylglycerols, obtained by partial glycerolysis of vegetable oils mainly containing triacylglycerols of linoleic ((9Z,12Z)-octadeca-9,12-dienoic) acid. A suitable antioxidant may be added.<\/p>\n

Content<\/h3>\n

\u2014 monoacylglycerols: 32.0 per cent to 52.0 per cent;<\/p>\n

\u2014 diacylglycerols: 40.0 per cent to 55.0 per cent;<\/p>\n

\u2014 triacylglycerols: 5.0 per cent to 20.0 per cent.<\/p>\n

CHARACTERS<\/h2>\n

Appearance<\/h3>\n

Amber, oily liquid which may be partially solidified at room temperature.<\/p>\n

Solubility<\/h3>\n

Practically insoluble in water, freely soluble in methylene chloride.<\/p>\n

IDENTIFICATION<\/h2>\n

A. Iodine value (see Tests).<\/p>\n

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

Test solution: Dissolve 1.0 g of the substance to be examined in methylene chloride R and dilute to 20 mL with the same solvent.<\/p>\n

Reference solution: Dissolve 1.0 g of glycerol monolinoleate CRS in methylene chloride R and dilute to 20 mL with the same solvent.<\/p>\n

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

Mobile phase hexane R, ether R (30:70 V\/V).<\/p>\n

Application 10 \u03bcL.<\/p>\n

Development: Over a path of 15 cm.<\/p>\n

Drying In air.<\/p>\n

Detection: Spray with a 0.1 g\/L solution of rhodamine B R in ethanol (96 per cent) R and examine in ultraviolet light at 365 nm.<\/p>\n

Results: The spots in the chromatogram obtained with the test solution are similar in position to those in the
\nchromatogram obtained with the reference solution.<\/p>\n

C. Composition of fatty acids (see Tests).<\/p>\n

TESTS<\/h2>\n

Acid value (2.5.1)<\/h3>\n

Maximum 6.0, determined on 1.0 g.<\/p>\n

Iodine value (2.5.4, Method A)<\/h3>\n

100 to 140.<\/p>\n

Peroxide value (2.5.5, Method A)<\/h3>\n

Maximum 12.0, determined on 2.0 g.<\/p>\n

Saponification value (2.5.6)<\/h3>\n

160 to 180, determined on 2.0 g.<\/p>\n

Free glycerol<\/h3>\n

Maximum 6.0 per cent, determined as described in the assay.<\/p>\n

Composition of fatty acids (2.4.22, Method C)<\/p>\n

Composition of the fatty acid fraction of the substance:<\/h3>\n

\u2014 palmitic acid: 4.0 per cent to 20.0 per cent;<\/p>\n

\u2014 stearic acid: maximum 6.0 per cent;<\/p>\n

\u2014 oleic acid: 10.0 per cent to 35.0 per cent;<\/p>\n

\u2014 linoleic acid: minimum 50.0 per cent;<\/p>\n

\u2014 linolenic acid: maximum 2.0 per cent;<\/p>\n

\u2014 arachidic acid: maximum 1.0 per cent;<\/p>\n

\u2014 eicosenoic acid: maximum 1.0 per cent.<\/p>\n

Water (2.5.12)<\/h3>\n

Maximum 1.0 per cent, determined on 1.00 g. Use as the solvent a mixture of equal volumes of anhydrous methanol R and methylene chloride R.<\/p>\n

Total ash (2.4.16)<\/h3>\n

Maximum 0.1 per cent.<\/p>\n

ASSAY<\/h2>\n

Size-exclusion chromatography (2.2.30).<\/p>\n

Test solution: Into a 15 mL flask, weigh about 0.2 g (m), to the nearest 0.1 mg. Add 5 mL of tetrahydrofuran R and shake to dissolve. Reweigh the flask and calculate the total mass of solvent and substance (M).<\/p>\n

Reference solutions: Into four 15 mL flasks, respectively weigh, to the nearest 0.1 mg, about 2.5 mg, 5 mg, 10 mg and 20 mg of glycerol R. Add 5 mL of tetrahydrofuran R and shake until well mixed. Weigh the flasks again and calculate the concentration of glycerol in milligrams per gram for each reference solution.<\/p>\n

Column:<\/p>\n

\u2014 size: l = 0.6 m, \u00d8 = 7 mm,<\/p>\n

\u2014 stationary phase: styrene-divinylbenzene copolymer R (5 \u03bcm) with a pore size of 10 nm.<\/p>\n

Mobile phase tetrahydrofuran R.<\/p>\n

Flow rate 1 mL\/min.<\/p>\n

Detection: Differential refractometer.<\/p>\n

Injection 40 \u03bcL.<\/p>\n

Relative retention: With reference to glycerol (retention time = about 15.6 min): triacylglycerols = about 0.76;
\ndiacylglycerols = about 0.80; monoacylglycerols = about 0.86.<\/p>\n

Calculations:<\/p>\n

\u2014 free glycerol: from the calibration curve obtained with the reference solutions, determine the concentration of glycerol (C) in milligrams per gram in the test solution and calculate the percentage content of free glycerol (A) in the substance to be examined using the following expression:<\/p>\n

C\u00d7M\/m\u00d710<\/p>\n

\u2014 free fatty acids: calculate the percentage content of free fatty acids (D) using the following expression:<\/p>\n

IA<\/sub>\u00d7280\/56.11\u00d710<\/p>\n

IA<\/sub> = acid value (see Tests);<\/p>\n

280 = rounded molar mass of linoleic acid, in grams per mole;<\/p>\n

56.11 = molar mass of potassium hydroxide, in grams per mole.<\/p>\n

\u2014 monoacylglycerols: calculate the percentage content of monoacylglycerols using the following expression:<\/p>\n

\"Glycerol<\/p>\n

A = percentage content of free glycerol;<\/p>\n

B = percentage content of water (see Tests);<\/p>\n

D = percentage content of free fatty acids;<\/p>\n

X = area of the peak due to monoacylglycerols and free fatty acids;<\/p>\n

Y = area of the peak due to diacylglycerols;<\/p>\n

Z = area of the peak due to triacylglycerols.<\/p>\n

\u2014 diacylglycerols: calculate the percentage content of diacylglycerols using the following expression:<\/p>\n

\"Glycerol<\/p>\n

\u2014 triacylglycerols: calculate the percentage content of triacylglycerols using the following expression:<\/p>\n

\"Glycerol<\/p>\n

STORAGE<\/h2>\n

In an airtight container, protected from light.<\/p>\n","protected":false},"excerpt":{"rendered":"

(Ph. Eur. monograph 1429) Action and use Excipient. DEFINITION Mixture of monoacylglycerols, mainly mono-oleoyl- and monolinoleoylglycerol, together with variable quantities of di- and triacylglycerols, obtained by partial glycerolysis of vegetable oils mainly containing triacylglycerols of linoleic ((9Z,12Z)-octadeca-9,12-dienoic) acid. A suitable antioxidant may be added. Content \u2014 monoacylglycerols: 32.0 per cent to 52.0 per cent; \u2014…<\/p>\n","protected":false},"author":3,"featured_media":13460,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[174],"tags":[],"class_list":["post-13338","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\/13338","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=13338"}],"version-history":[{"count":4,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/13338\/revisions"}],"predecessor-version":[{"id":13461,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/13338\/revisions\/13461"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/media\/13460"}],"wp:attachment":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/media?parent=13338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/categories?post=13338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/tags?post=13338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}