In one embodiment of the invention, the cocoon threads can be immersed in the uniquely-produced and pH variation-resistant alkaline ionic water from the strongly alkaline ionic water generator device (100), and then are subjected to physical oscillation with ultrasonic wave and/or with magnetic field at room temperature. The novel ultrasonic-induced physical oscillation of the cocoon threads immersed in the uniquely-produced and pH variation-resistant alkaline ionic water results in separation and extraction of the high-molecular-weight sericin solution from the cocoon threads. The extraction of sericin at room temperature using the ultrasonic oscillation of the cocoon threads avoids the conventional thermal treatment of the cocoon threads, thereby resulting in the high molecular weight of the sericin solution, which is particularly desirable for human skin moisturization and protection applications. The high-molecular weight sericin solution produced in accordance with an embodiment of the invention also provides better adhesion to an object, thereby enabling sericin coating on a glove to be a more economical and commercially-streamlined process than a conventional process requiring additional adhesive materials for sericin coating