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用盐提法从新鲜向日葵花盘中得到果胶酯酶（ＰＥ）的粗提取液，用ｐＨ－ｓｔａｔ法测得的ＰＥ酶活值较高。此种ＰＥ的最适温度为４５℃左右。５０℃以上ＰＥ的热稳定性下降，５５℃下恒温２０分钟，ＰＥ的活力下降６０％．向日葵花盘中ＰＥ的活力受花盘的成熟度等因素影响。
The crude extract of pectin esterase (PE) was obtained from the fresh sunflower disk by salt extraction, and the PE activity measured by pH-stat method was higher. The optimum temperature for this kind of PE is about 45 ℃. The thermal stability of PE above 50 ℃ decreased, the temperature was maintained at 55 ℃ for 20 minutes and the viability of PE decreased by 60%. The vitality of PE in sunflower disk is affected by the maturity of the disk and other factors.