The kinetic chromogenic Limulus Amebocyte Lysate (LAL) test kit was used to determine the endotoxicity according to the instructions of the manufacturer (Charles River Endosafe, USA). Reagent endotoxin (Escherichia coli O55: B5) was used as received (Charles River Endosafe, USA) and was dissolved in endotoxin-free (pyrogen-free) water [3]. A total of 1 mL of the reagent endotoxin solution was sampled at each time intervals of experiments in pyrogen-free plastic vials (10 mL), mixed with LAL, and then analyzed continuously spectrophotometrically (HP 8452A, diode array spectrophotometer, USA) at 405 nm for 15 min at 37 °C. The standard endotoxin (CSE) made from E. coli O111:B4 was used for the calibration curves (0.03–4.51 EU/mL). The decomposition of endotoxin, which is obtained by the Limulus Amebocyte Lysate (LAL) test, directly relates to the decomposition of lipid A, since the intact structure of lipid A is required for pyrogenicity and lethal toxicity of endotoxin [2] and [4].