PHYTOCHEMICAL CHARACTERIZATION AND COMPARATIVE QUANTIFICATION OF VARIOUS ALKALOIDAL CONSTITUENTS IN ZINGIBER OFFICINALE RHIZOME EXTRACTS DERIVED VIA METHANOL MACERATION EXTRACTION

Ginger (Zingiber officinale) is one of the most studied medicinal plants, and its bioactive compounds, especially alkaloids, have been demonstrated to possess intense pharmacological activities. We aimed to identify and quantify the major alkaloids present in ginger rhizomes, using phytochemical screening, spectrophotometric analysis and high-performance liquid chromatography (HPLC). The authenticated fresh ginger rhizomes were processed by methanol extraction, which produced 0.704% (w/w) crude extract. In qualitative tests (Mayer’s, Wagner’s, and Dragendorff’s reagents) alkaloids were confirmed; and in spectrophotometric tests, total alkaloid content was determined (18.45 ± 1.27 mg of atropine equivalents/g of extract). In addition, we also analyzed constituents of ginger and found four principal alkaloids of HPLC as follows: 6-gingerol (10.73 ± 0.85 mg/g), 6-shogaol (10.42 ± 0.47 mg/g), 8-gingerol (3.81 ± 0.32 mg/g) and 10-gingerol (3.45 ± 0.43 mg/g). The calibration curves (r²>0.95) for these compounds were excellent, indicating reliability of the method. The high contents of 6-gingerol and 6-shogaol are associated with their well-known anti-inflammatory, antioxidant and anticancer effects, whereas those of 8- and 10-gingerol add to those are presented related to antimicrobial and metabolic regulator activity. The results reveal not only the pharmacological significance of ginger alkaloids but also validates the extraction and analytic technique employed. The results provide a comprehensive summary of ginger’s alkaloidal profile, providing further support for its historical medicinal properties and potential therapeutic usages. Integrated studies could give the synergistic outcome of these compounds in curing disease.