仪器名称 | 成像质谱显微镜 (Imaging Mass Microscope) |
规格型号 | iMScope QT |
仪器放置位置 | 厦门大学翔安校区能源材料大楼1号楼1260实验室 |
仪器功能介绍 | 将光学显微镜和质谱仪整合成一体,既可观察到薄膜、界面、生物组织等样品高分辨率的形态图像,又可以对特定的分子进行鉴定和可视化分布分析,一次性分析得到样品的定性、定量、形态、位置等信息。 |
性能指标 | 质谱成像单元:AP-MALDI源 激光类型:激光二极管激发Nd,YAG 355nm 激发器 空间分辨率:≤5 μm 图像分辨率:≤1 μm激光频率:达到20KHz 激光照射直径:5-100 μm 显微镜物镜放大倍率:×5,×10,×40 质谱单元 :Q-tof 离子源:ESI 质量范围:10-40000m/z 质量精确度:<3 ppm |
样品要求 | 测LC-MS 9030部分:液体送样,样品中不能含有含有强酸、碱、硬离子无机盐及表面活性剂,溶剂为色谱纯以上,无不溶颗粒,样品浓度一般有机物约为10mg/L,难电离物种需增大浓度可为1mg/mL,团簇等特殊样品需要浓度则更高,需配置为有明显颜色。 测成像部分: 1、本实验室暂不提供切片设备,如需测试请切片后放置特定的ITO玻璃,可使用50mL离心管,底部放置少量硅胶加无尘纸隔档,再放置一片载玻片,拧紧后保存。运输时也采用此方式但需要干冰冷链运输。长期保存需要在-80℃冰箱。 2、切片推荐使用的包埋剂:明胶、CMC水溶液等,禁止使用石蜡和明胶,影响成像。 3、常备的基质有DHB、CHCA、9-AA,如需要其他基质请自备 4、实验室配备了基质升华和基质喷雾设备,前处理方法需要先找好资料。 测MALDI部分: 1、对于蛋白样品,样品量:50pmol干粉或1ug/uL以上(一般测试),盐含量:挥发性无机盐,<20mM,请勿使用PBS、SDS和尿素等质谱干扰物质,样品质荷比范围在10-40000 m/z之间。其他小分子化合物浓度尽量在1 mg/ml以上 2、如样品在水、甲醇、乙腈中均不可溶解,应提前声明适配溶剂,并提前备注好所需要的基质,实验室常备基质有:DHB,CHCA,9-AA。 3、样品如具有腐蚀性、毒性等必须提前声明其危害性。 4、尽量提供样品或近似结构的物种文献或以前测试过的可供参考的测试条件(测试模式:正、负离子,一级或者二级质谱等)。 |
仪器说明 | 积聚LC-MS(APCI、ESI)和MALDI成像两大功能 |
型号与参数(文献参考) | AP-MALDI-MSI was performed using an iMScope QT (Shimadzu,Kyoto, Japan). The acquisition area was determined with the help ofan optical microscope, and the tissue was irradiated with a laser diode-excited neodymium-doped yttrium aluminum garnet (Nd/YAG) laser(355 nm). The laser diameter was 5 μm(5-100 μm). The sample was laser-irradiated with 100 shots (1000 Hzrepetition rate) for each pixel. All of the data were acquired in the positive and negative modes, and the mass ranges were m/z 100−500 and m/z 500−1000 for samples, respectively. Hop constituents and metabolites in serum weremeasured using UHPLC−MS and UHPLC−MS/MS with negative ionelectrospray on a Shimadzu (Kyoto, Japan) Nexera UHPLC systeminterfaced with a Shimadzu 9030 Q-ToF mass spectrometer. Chromatographic separations were carried out using a ThermoScientific (Waltham, MA) Hypersil Gold column (1.9 μm, 2.1 × 50mm) with a gradient from water (containing 0.1% formic acid) toacetonitrile as follows: 20% acetonitrile 0−1 min, 20−70% acetonitrile1−4.5 min, hold at 70% acetonitrile 4.5−5.5 min, 70−95% acetonitrilefrom 5.5 to 5.6 min, 0.5 min hold at 95% acetonitrile, and then re-equilibration at 20% acetonitrile for 1 min. The column oventemperature was 40 °C, and the flow rate was 0.5 mL/min. he resolving power of the Q-ToF analyzer was 30,000 (full width athalf-maximum at m/z 426.6935). The nebulizing gas flow was 3.0 L/min, the heating gas flow was 10.0 L/min, the drying gas flow was 10.0L/min, the interface temperature was 300 °C, the desolvation linetemperature was 250 °C, the heat block temperature was 400 °C, andthe interface voltage was 3.5 kV. The collision energy for product iontandem mass spectrometry was 25 eV with a 10 eV spread for precursorions, 35 eV with a 17 eV spread for sulfate and glucuronic acidconjugates, and 40 eV with a 10 eV spread for diglucuronides andsulfate-glucuronic acid diconjugates. 1、TOF质量范围:m/z 10-40,000 Da 2、 四级杆质量范围:m/z 10-2,000 Da 3、质量精确度<3 ppm 4、 灵敏度:MS模式下,S/N ≥ 15000:1 最大分辨率≥30,000 5、QT:空间分辨率:≤5 μm 图像分辨率:≤1 μm 激光频率:最大达到20KHz 激光照射直径:5-100 μm 显微镜物镜放大倍率:×5,×10,×40 6、雾化器流量:3.0 L/min 加热气流量:10.0 L/min 接口温度:300 ℃ 干燥气流量: 10.0 L/min DL温度:250℃ 加热块温度:350 ℃ |