Solvents and chemicals
Monosodium l-glutamate was procured from Sigma-Aldrich limited, India. Food products were procured commercially. Chromatographic grade solvents such as methanol, chloroform, acetone, and formic acid were obtained from Qualigens Chemicals, Mumbai, India. Ninhydrin was procured from Rankem Chemicals, Mumbai, India.
Standard and sample solutions
Monosodium l-glutamate (100 mg) was accurately weighed into a 100-mL volumetric ask, dissolved in water, and the solution was diluted to volume with the same solvent to furnish a working standard.
Accurately weighed sample equivalent to 1 g and transferred to a 100-mL volumetric ask, dissolved in water (50 mL), sonicated for 15 min in an ultrasonicator, and made up to the volume with the same solvent. The solution was then ltered through Whatmann’s No. 42 lter paper. One milliliter of the ltrate was taken in a 10-mL volumetric ask and diluted to the volume with methanol and used for analysis.
Chromatography
Chromatography was performed on aluminum-backed silica gel 60 GF254 TLC plates prewashed with methanol.
Standard solutions of MSG were transferred to different 10 mL volumetric asks and diluted to volume with the methanol such that the nal concentrations were 0.4–1 μg/μL. Standards and three different sample solutions were applied to the TLC plates as 8 mM bands with 9 mM space between two bands using a Camag Linomat IV sample applicator. Plates were developed with a mobile phase of methanol–chloroform– formic acid 5 + 5 + 1 (v/v) in a TLC twin trough chamber.
After development, the plates were derivatized with 1% ninhydrin solution in acetone and dried at 60°C for 5 min. The quanti cation of the standards and samples were performed by means of a Camag TLC scanner III controlled by WinCATS 4.06 version software. The amount of MSG in the sample solutions were computed from the calibration plot.
Solvents and chemicalsMonosodium l-glutamate was procured from Sigma-Aldrich limited, India. Food products were procured commercially. Chromatographic grade solvents such as methanol, chloroform, acetone, and formic acid were obtained from Qualigens Chemicals, Mumbai, India. Ninhydrin was procured from Rankem Chemicals, Mumbai, India.Standard and sample solutionsMonosodium l-glutamate (100 mg) was accurately weighed into a 100-mL volumetric ask, dissolved in water, and the solution was diluted to volume with the same solvent to furnish a working standard.Accurately weighed sample equivalent to 1 g and transferred to a 100-mL volumetric ask, dissolved in water (50 mL), sonicated for 15 min in an ultrasonicator, and made up to the volume with the same solvent. The solution was then ltered through Whatmann’s No. 42 lter paper. One milliliter of the ltrate was taken in a 10-mL volumetric ask and diluted to the volume with methanol and used for analysis.ChromatographyChromatography was performed on aluminum-backed silica gel 60 GF254 TLC plates prewashed with methanol.Standard solutions of MSG were transferred to different 10 mL volumetric asks and diluted to volume with the methanol such that the nal concentrations were 0.4–1 μg/μL. Standards and three different sample solutions were applied to the TLC plates as 8 mM bands with 9 mM space between two bands using a Camag Linomat IV sample applicator. Plates were developed with a mobile phase of methanol–chloroform– formic acid 5 + 5 + 1 (v/v) in a TLC twin trough chamber.After development, the plates were derivatized with 1% ninhydrin solution in acetone and dried at 60°C for 5 min. The quanti cation of the standards and samples were performed by means of a Camag TLC scanner III controlled by WinCATS 4.06 version software. The amount of MSG in the sample solutions were computed from the calibration plot.
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