脂肪酸检测报告(烟草)

项目报告
1 样品信息Sample description
收到烟草样品xx个,a和b
A total of xx tobacco samples, where received by the customer.
2 材料与方法Materials and Methods
2.1 试剂Chemicals
所有的溶剂与试剂均为色谱级,亚麻酸,亚油酸,棕榈酸,油酸,硬脂酸标准品购于xxx
All chemicals and solvent were HPLC. Standard: linolenic acid, linoleic acid, palmitic acid , oleic acid, stearic acid and were purchased from xxx.
2.2 样品处理Sample Preparation
1) 将样品摇匀,称取1.0 g左右的样品;
2) 1.0 g样品中加入50 mL 3 mol/L xxx-乙醇溶液,60℃水浴皂化20 min;
3) 冷却,加入20 mL蒸馏水,混匀,用盐酸调pH至3.0~4.0;
4) 用无水乙醚萃取2次,合并醚层;
5) 加入30 mL xxx反萃取乙醚相,醚层用氮气吹干;
6) 残留物用xxx定容至2 mL,并用0.22 µm滤膜过滤,进样15 µL。
2.3 HPLC分析HPLC Analysis
本实验所用的仪器为Waters 2695型高效液相色谱仪,配备蒸发光散射检测器。
色谱柱为xxx C18 (250 mm*4.6 mm, 5 μm),流动相A为甲醇,B为1% xxx溶液,流速为1.0 mL/min,柱温为25℃。
3 结果Results
色谱图Chromatogram

