| 摘要 |
PROBLEM TO BE SOLVED: To provide freeze indicators comprising dispersion liquid of organic material indicator particles in an aqueous liquid medium.SOLUTION: A freeze indicator can include an indicator dispersion liquid having an aqueous liquid medium and organic material indicator particles dispersed in the aqueous liquid medium. The indicator dispersion can have initial appearance before freezing and irreversibly different appearance after freezing, and can exhibit freeze start temperature of about -1.9°C or higher. Some factors helpful to providing the relatively high freeze start temperature are employment of a proteinaceous ice nucleating agent, control of a pH, use of a protein stabilizer and control of ratio of the protein stabilizer to the ice nucleating agent. |
