Abstract
Aim: Method validation is a step to ensure that the method used is in accordance with the desired goals. The Category I validation method determines the content of the main ingredient in the drug substance. Galactomannan is a watersoluble polysaccharide composed of D-galactose and D-mannose and is the main component in guar gum. Materials and Methods: To determine galactomannan content, concentrated phenol-sulfuric acid was used using the UV-Vis Spectrophotometry method. Hydrolysis of guar gum is required to react with phenolic reagents to form colored compounds. Results and Discussion: Optimization of the formation of colored derivative compounds was carried out by hydrolysis of guar gum with the addition of 1.0 mL of sulfuric acid, 30 min time, 100°C temperature, and color stability at 180 min. Method validation was successfully carried out by testing several parameters, including selectivity with the selected wavelength 492 nm. Linear regression equation y = 0.0255 × + 0.0420 (r: 0.9998) and Vxo = 0.76%. The precision expressed in the Coefficient of Variation (C.V) is 1.06%. Accuracy was obtained 100.35 ± 0.56 (%; w/w). Conclusion: In determining the galactomannan content in guar gum powder, it was 70.00 ± 0.24 (%; w/w).
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