咖啡酸

质量标准:
1 熔点            　219-224℃                                                                  
2 氯化物　　   ≤0.01%                                                                         
3 水分               ≤0.5%                                                                          
4 重金属           ≤0.0015%                                                                   
5 灼烧残渣       ≤0.2%                                                                         
6 红外               符合                                                                          
7 指标               ≥98.0%干品计
8 外观               嫩黄色结晶或结晶性粉末，无臭。