PURPOSE: A coagulant for bean curd and the bean curd using the same are provided to use the coagulant which is harmless to the human body and contains abundant amount of minerals when producing the bean curd. CONSTITUTION: Underground salt water is concentrated into 30 brix. The concentrated underground salt water is mixed with a black garlic extract in a ratio of 70-90:30-10 to obtain a coagulant for bean curd. 100 parts by weight of heated soymilk is mixed with 0.1-1 parts by weight of the coagulant for bean curd to obtain coagulated soymilk. The coagulated soymilk is compression-molded. The concentrated underground salt water contains 50,000-70,000 mg/l of calcium, 500-1,000 mg/l of magnesium, and 15,000-40,000 mg/l of sodium. 30 brix of concentrated underground salt water additionally contains 5-20 mg/l of silicon and 5-20 mg/l of zinc. Bean curd contains 400-550 mg/kg of calcium. The underground salt water before the concentration contains 4,000-6,000 ppm of calcium, 20-70 ppm of magnesium, and 1,500-3,000 ppm of sodium.본 발명은 흑마늘 추출물 및 지하염수를 포함하는 두부용 응고제 및 이를 사용하여 제조된 두부에 관한 것으로, 보다 상세하게는 30 brix 농축액 기준으로 칼슘 50,000 내지 70,000 mg/l, 마그네슘 500 내지 1,000 mg/l 및 나트륨 15,000 내지 40,000 mg/l를 함유하는 지하염수의 농축액； 및 흑마늘 추출액；을 포함함으로써 인체에 무해하며, 천연 미네랄의 별도의 추가 공정 없이 기능성 및 기호성이 뛰어난 두부 및 그 제조방법에 관한 것이다.
