Abstract: The present invention discloses a method of preparing procollagen from freshwater fish. The method comprises the following steps: pressure treatment, physical crushing, mixing and emulsification, homogenization, refrigeration, cleaning, extraction, homogenization, inactivation, homogenization, and filtration. In the mixing and emulsification step, freshwater fish tissue containing collagen is mixed with a surfactant to remove endotoxins to below 0.25 EU/ml. The procollagen is extracted following the step of adding enzymes and an acid solution of pH 3 to 6 to the pretreated tissue. The pretreatment of freshwater fish tissue in this invention can effectively reduce the endotoxins to below 0.25 EU/ml. The extraction technique of this invention can extract and retain greater amounts of procollagen while increasing its denaturation temperature and preserving the intact, tightly twisted triple-helix bonds of type I procollagen.

Abstract: A container has a body, two handles, a handle combination structure, and two lids. The body has a body space formed in the body. The handles are connected with the body, and each handle has two connecting portions and two bent grooves. The connecting portions are formed between the handle and the body and are bendable. The bent grooves are defined in the handle and are adjacent respectively to the connecting portions of the handle. The handle combination structure is formed on the handles to selectively combine the two handles with each other. The lids are connected with the body and are respectively located in spaces which are respectively formed between the body and the handles. Each lid has a connecting portion formed between the body and the lid and being bendable.

Abstract: A container is in an integral form, and has a body, two handles, a handle combination structure, a folding combination structure, and two lids. The handles are connected with the body, and connecting portions between the handles and body are bendable. The handle combination structure is formed on the handles to selectively combine the handles. The folding combination structure is formed on the handles and the connecting plates to selectively combine the handles and the body. The lids are connected with the body, are respectively located in spaces which are respectively formed in the body and the handles, and connecting portions between the body and the lids are bendable.

Abstract: A container is in an integral form, and has a body, two handles, a handle combination structure, a folding combination structure, and two lids. The handles are connected with the body, and connecting portions between the handles and body are bendable. The handle combination structure is formed on the handles to selectively combine the handles. The folding combination structure is formed on the handles and the connecting plates to selectively combine the handles and the body. The lids are connected with the body, are respectively located in spaces which are respectively formed in the body and the handles, and connecting portions between the body and the lids are bendable.