Method for preparing kaffir lime extract and composition comprising kaffir lime extract

A method for preparing a kaffir lime extract, the method comprising steps of:

• low-temperature-treating kaffir lime leaves;
• washing the low-temperature-treated kaffir lime leaves, followed by cutting into a size of 2 cm or less in width and 10 cm or less in length;
• freezing the cut kaffir lime leaves;
• adding purified water to the frozen cut kaffir lime leaves in an amount 5 to 10 times the weight of the cut kaffir lime leaves, followed by crushing and then heating at a temperature of 88° C. to 92° C. for 5 to 7 hours;
• and
• cooling the heated and crushed materials to room temperature of 20° C. to 25° C., followed by filtration and concentration,
• wherein the step of low-temperature-treating the kaffir lime leaves comprises illuminating the kaffir lime leaves with an illuminance of 1,000 to 1,200 Lux for 9 hours/day to 11 hours/day at a temperature of 5° C. to 10° C. for 8 to 12 days.