Methods: The sample was extracted by aether in superwave. The buffer was 20 mmol/L phosphate (pH=7.0)and detective wavelength was 238 nm.

• 方法:样品用乙醚超声提取；缓冲液为20mmol/L磷酸盐缓冲液；pH=7.；紫外检测波长238nm。；