2.3. Equipment
COLD
Spray bottle: The capacity was 20 mL, and the amount of spray liquid was 0.5 mL per pressing. Manufacturer: Miniso (Nanjing Co., Ltd.); Sterilized water: The capacity was 500 mL and placed in the refrigerator at 4 °C. And it was be directly loaded into the selected watering to make ice water spray. Manufacturer: Shiyao Yinhu Pharmaceutical Co., Ltd. Menthol: The menthol for food flavor was soluble in water to prepare the menthol spray liquid. The preparation method was as following: We took l mL of menthol, added it to 500 mL sterilized water at 4 °C in cold storage, shake well enough to prepare a saturated solution of menthol with a concentration of 2‰. Menthol manufacturer: Nanjing Hua Yang Essence and Fragrance Industry Co., Ltd.