大昌华嘉科学仪器?/p>
已认?/p>
一?/span>样品前处琅/span>
1?/span>所用试剁/span>
必须使用重蒸馏水或与之等质的水(电导率<10μs(/span>
1?双氧氳/span>,30%
1?甲酸+/span>98-100%
1?苯酚:须重蒸
1?偏重亚硫酸钠
1?氢氧化钠
1?盐酸,ρ=1.18g/ml
1?水解剂:6mol/l皃/span>HCL+/span>1L?/span>1g苯酚9/span>
功/span>1g苯酚'/span>3.3)到492mL盐酸(3.7)中,然后用水定容臲/span>1L
1?20种氨基酸标准?/span>
行号 |
氨基酷/span> |
行号 |
氨基酷/span> |
||
1 |
CYS-OX |
磺基丙氨酷/span> |
2 |
TAU |
牛磺酷/span> |
3 |
MET-SO2 |
蛋氨酸砜 |
4 |
ASP |
天冬氨酸 |
5 |
THR |
苏氨酷/span> |
6 |
SER |
丝氨酷/span> |
7 |
GLU |
谷氨酷/span> |
8 |
PRO |
脯氨酷/span> |
9 |
GLY |
甘氨酷/span> |
10 |
ALA |
丙氨酷/span> |
11 |
VAL |
缬氨酷/span> |
12 |
MET |
蛋氨酷/span> |
13 |
ILE |
异亮氨酸 |
14 |
LEU |
亮氨酷/span> |
15 |
NLE |
正亮氨酸 |
16 |
TYR |
酪氨酷/span> |
17 |
PHE |
苯丙氨酸 |
18 |
HIS |
组氨酷/span> |
19 |
LYS |
赖氨酷/span> |
20 |
ARG |
精氨酷/span> |
2?/span>标样配置
氨基酸混合标准储备液:称取上述各氨基酸标样使?/span>PH2.2皃/span>Load Buffer配置戏/span>2.5umol/L的储备液备用、/span>
取氨基酸混合标准储备液与PH2.2皃/span>Load Buffer?/span>1:9的比例配置成0.25umol/L的标准液、/span>
3?/span>前处理设夆/span>
1)天平
2)水解箠/span>
3)量筒
4)无油真空泴/span>
5)干浴水解、浓缩仪
6)移液箠/span>
7)0.45um滤膜
4?/span>样品制备(参耂/span>欧盟饲料指令98/64/EC(/span>
1?/span>样品的准夆/span>
粉碎样品,通过0.5mm的筛孔。高水分的样品粉碎前必须低于50ℂ/span>鼓风干燥或者冷冻干燥。高脂肪含量的样品粉碎前必须用轻质石油(3.12)脱脂、/span>
2?/span>氧化
从准备好的样品中称取?/span>0.1~1兊/span>样品,准确到0.2mg,于100 ml带螺纹盖子的瓶子中,称取的样品应该含有大?/span>10mg氮,水分不能超过100mg。将瓶子放于冰水浴中冷却臲/span>0ℂ/span>,加5ml氧化试剂(过甲酸苯酚),用带弯头的玻璃刮勺混合。用空气密封膜将瓶子和刮勺一起密封,密封后一起放?/span>0ℂ/span>冰箱的冰水浴中,放置16小时。之后,从冰箱中取出,加0.84兊/span>偏重亚硫酸钠'/span>3.4)来分解过量的氧化试剂、/span>
3?/span>水解
加入25毫升盐酸-苯酚溶液,然后将反应瓶放在烘箱中,温度控制?/span>110摄氏度,旋松帽子(防止玻璃瓶子破裂),水觢/span>1小时。然后快速旋紧瓶塞(戴手套和护眼罩)将其继续在烘箰/span>110摄氏度下水解23小时、/span>
4?/span>加入内标并且调节pH值到2.20
当水解反应结束后,将反应瓶从烘箱中取出,并且打开瓶口(戴手套和护目镜)。冷却后用定量加样器准确加入15.00兊/span>(15毫升)正亮氨酸标准溶液,混合并且转移水解溶液到250毫升的塑料烧杯中。加入大?/span>125毫升柠檬酸缓冲液咋/span>19毫升氢氧化钠水溶涱/span>,将实验烧杯放入到样品容器中用氢氧化钠水溶液将溶液调节?/span>pH为正奼/span>2.20、/span>
转移一部分溶液(不需要全部)?/span>50毫升有盖子的塑料瓶中。可以马上测定或者放入冰箱等到分析的时候测定、/span>
二?/span>分析方法描述'/span>Biochrom 30+(/span>
氨基酸分析仪分析方法参数9/span>
1)色谱柱:Biochrom Na型阳离子交换树脂柱,4.6´20cm
2)分离程序9/span>
NO. |
Time |
Temp |
Buffer |
Pump |
Nin |
Rec |
Commands |
1 |
01:00 |
53 |
3 |
35.0ml/h |
ON |
OFF |
|
2 |
00:00 |
53 |
3 |
35.0ml/h |
ON |
OFF |
Reset |
3 |
03:30 |
53 |
3 |
35.0ml/h |
ON |
OFF |
Load |
4 |
15:45 |
53 |
1 |
35.0ml/h |
ON |
ON |
|
5 |
12:00 |
58 |
2 |
35.0ml/h |
ON |
ON |
|
6 |
02:00 |
58 |
4 |
35.0ml/h |
ON |
ON |
|
7 |
26:00 |
92 |
4 |
35.0ml/h |
ON |
ON |
|
8 |
04:00 |
92 |
6 |
35.0ml/h |
ON |
ON |
|
9 |
04:00 |
92 |
3 |
35.0ml/h |
ON |
ON |
|
10 |
14:00 |
53 |
3 |
40.0ml/h |
OFF |
OFF |
|
11 |
02:45 |
53 |
3 |
35.0ml/h |
ON |
OFF |
|
End |
3)运行时间:分析时闳/span>65min
4)反应单元温度9/span>135°C、/span>
5)检测波长:570nm?/span>440nm同时检测、/span>
三?/span>外标法定野/span>
附、鱼粈/span>A分析图谱
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