Phytochemical study of Laurence papulosa [forsook] grev part II lipids proteins and carbohydrates

ABSTRACT

The thalli of the red alga Laurencia papillosa [Forssk.] Grev. yield 0.18% of lipids. Cholesterol was isolated and identified in the unsaponifiable fraction. Arachidic, arachidonic, heptadecanoic, lauric, myristoleic, palmitic, oleic or linoleic, stearic, tridecanoic and undecanoic acids were identified among 21 components of the saponifiable fraction by GLC technique. The total protein content in the thalli amounted 9.2%. Paper and two dimensional TLC techniques of the free amino acids and protein hydrolysate prepared from algal thalli showed the presence of alanine, aspartic and glutamic acids, leucine, serine, threonine, and tryptophan. While arginine, cystine, phenyl alanine, and valine were only noticed in the protein hydrolysate. Quantitative analysis of each of the amino acids in each fraction was carried out. The alga yielded 19.75% of neutral mucilage when extracted successively with cold and hot water. Xylose, mannose, glucose, galactose and galacturonic acid were detected in both cold and hot water mucilage hydrolysates by paper and TLC techniques