Menaquinone ( vitamin K_2) is a high efficiency counteractant bleeding medicament. 维生素K2是高活性的抗出血药物。
The compositions of ubiquinone and menaquinone were determined directly using combined information of retention time, UV spectrum and mass spectrum without any standard samples. 利用保留时间、UV光谱和质谱在没有任何标样的情况下可以确认泛醌和甲基萘醌的成分。