Water soluble Psidium guajava leaf extract having standardized phytochemicals

A method for preparation of water soluble Psidium guajava leaf extract, the method comprising the steps of:

• a. milling the dried and cleaned Psidium guajava leaves into a coarse powder of uniform size using 0.2 mm mesh (201);
• b. extracting the coarse powder with a hydro alcohol at a temperature not exceeding 70° C. for a period of 3 hours (202);
• c. filtering the liquid extract through a fine filter cloth of about 100 mesh size (203);
• d. evaporating the filtered clear extract to remove the hydro alcohol completely and adjusting the concentrated extract with one or more total dissolved solids of 30% (204);
• e. allowing the concentrated filter extract to settle as a concentrate by subjecting to cold precipitation at 4° C. for 12 to 18 hours (205);
• f. filtering the concentrate using a by-flow filter bed to separate the settled matter (206);
• g. spray drying the filtrate extract to obtain pale brown to brown coloured powder (207);
• h. milling the dried and powdered extract and sieving to obtain uniform sized, free flowing powder (208);
• and
• i. analyzing the extract for the presence of phytochemicals (209).