Dried samples (0.300+-0.001g) were put into 10ml glass bottles and solved with 5 ml methanol for GC-MS method. The undissolved parts were separated with 25 mm polyethylene syringe filters (Millex,Merck KGa=aA, Germany).
Dried samples (0.300+-0.001g) were put into 10ml glass bottles and solved with 5 ml methanol for GC-MS method. The undissolved parts were separated with 25 mm polyethylene syringe filters (Millex,Merck KGa=aA, Germany).