英国Whatman沃特曼Cellulose Membranes纤维素滤膜

英国Whatman沃特曼Cellulose Membranes纤维素滤膜 | 时间: September-28 15:05:40 | 分类:其它仪器

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英国Whatman沃特曼Cellulose Membranes纤维素滤膜 

产品介绍:
Cellulose Membranes纤维素滤膜
Whatman提供以下纤维素膜:纯醋酸纤维素膜,纯硝酸纤维素膜,醋酸和硝酸混合纤维素酯膜.
Cellulose Acetate Membranes醋酸纤维素膜
Whatman醋酸纤维素膜由纯的醋酸纤维素制造而成,这使得这种膜用于生物和临床分析、无菌测试和闪烁测量非常理想。
醋酸纤维素膜的蛋白吸附力很低。它是亲水性膜,适用于水溶液和酒精(介质)。醋酸纤维素膜已经提高了溶剂抗性,尤其是对低分子量的醇类,同时加强了热稳定性。由于物理强度高,这种滤膜可以耐180摄氏度高温,所以适用于热气体以及用各种办法进行消毒,而保持膜的完整性。

技术参数-醋酸纤维素膜
型号           厚度            水流速        空气流速           起泡点
              (μm)        △p=0.9bar       △p=3mbar       (bar)
                      (ml/min/cm²)       (ml/min/cm²)
OE 66         115             20                         -                          3.7
OE 67         115             40                        25                        2.7
ST 68         140             170                       50                        1.5
ST 69         140             300                       90                        0.9
订货信息-醋酸纤维素膜
尺寸(mm)       孔径(μm)         目录号          无菌        数量/包装
WCA
25                   0.2                      7001-0004        否              100
25                        0.45                    7000-0002        否              100
47                        0.45                    7000-0004        否              100
OE 66
25                       0.2                       10404106         否              100
47                       0.2                       10404112         否              100
47                       0.2                       10404170         是              100
50                       0.2                       10404114         否              100
110                     0.2                       10404126         否              50
142                     0.2                       10404131         否              25
293                     0.2                       10404139         否              25
300x600             0.2                       10404180         否              5
OE 67
13                      0.45                      10404001         否              100
25                      0.45                      10404006         否              100
47                      0.45                      10404012         否              100
50                      0.45                      10404014         否              100
85                      0.45                      10404044         否              50
100                    0.45                      10404021         否              50
110                    0.45                      10404026         否              50
142                    0.45                      10404031         否              25
OE 67/A
142                    0.45                      10404331         否              25
ST 68
47                      0.8                        10403112         否              100
50                      0.8                        10403114         否              100
ST 69
47                      1.2                        10403012         否              100
50                      1.2                        10403014         否              100

Cellulose Nitrate Membranes硝酸纤维素膜
推荐用于大多数日常应用,是在严格控制室内清洁的条件下生产的。一般情况下,无需要求任何明显的技术改变,就可以直接替换掉其他生产厂商的用于一般过滤目的的滤膜。使用者会从Whatman现有的滤膜的改进中获得益处。
更高的强度和韧性
大多数膜本质上都很脆弱而且不容易操作;但是很少在装载到过滤器或在使用过程中损坏掉。Whatman硝酸纤维素膜韧性很明显加强了,能承受住在不破坏膜完整性的条件下操作、装载和消毒时的撕裂。经破裂测试已是较强的膜。
英国Whatman沃特曼Cellulose Membranes纤维素滤膜
低可提取水平
滤膜中可提取物水平和过滤或吸附技术的改进一样变得越来越重要。尤其是在药学、免疫学、生物学组织培养和衡量分析应用方面,高的提取物水平会起到负面影响。Whatman硝酸纤维素膜的提取物水平一般比其它同种型号的膜低。
孔径精确
Whatman滤膜一个主要特征是孔径精确度很高。膜的孔径率经先进的生产和控制系统严格控制。另外,批间差的变化较小,保持一致的实验结果。
增加的温度稳定性
滤膜可以在不失完整性的情况下在121摄氏度下进行正常消毒。硝酸纤维素膜有圆片、方片和卷状等规格。
收缩量减小
过多的收缩在消毒过程中会产生问题,也经常会在消毒后再滤器中发生膜的撕裂,也可能导致流速的降低和整个过滤量的减少。Whatman滤膜在消毒过程中收缩量低。
特征和优点:
一、孔径分布精确能改进表面俘获和分析。
二、提取物水平低,保证样品的完整性。
应用
一、样品分离
二、微生物研究
三、水溶液过滤
Cellulose Nitrate Filter Types硝酸纤维素膜类型
白色光滑滤膜
这是大多数实验室应用的标准滤膜,用于1.0μm-5.0μm大小的颗粒和细胞。过滤后的残留物大多数保留在膜的表面,可以进行沉淀物物理性回收和显微镜观察。
用于核算和蛋白分析的硝酸纤维素膜
1975年,E.M.Southern发明了从琼脂凝胶转移DNA到一张硝酸纤维素膜的技术。这个技术以它的发明者命名为Southern Blotting。随后,蛋白和RNA转移的技术也发展起来了。与层析技术相关的是需要相当数量的高质量的色谱纸,3MM纸已经成为全世界首选的层析纸。

技术参数-硝酸纤维素膜
硝酸纤维
厚度                                         125μm
爆裂强度                                 >2 psi
重量                                         3.6-5.5 mg/cm²
较高操作温度                          80
孔率                                          66-84%
蒸汽高压灭菌                          yes
亲水性                                      yes

 英国Whatman沃特曼Cellulose Membranes纤维素滤膜

典型应用-硝酸纤维素膜
应用领域                     孔径(μm)           应用领域                                孔径(μm)
普通                                                       沉淀物分析                            0.45
微过滤                         0.1                    悬浮颗粒                                 5
超净                             0.1                    空气污染监测             
灭菌                             0.2                    Asbestos Monitoring(NIOSH)   0.8
去除大多数微生物     0.45                  食品饮料控制            
分析性沉淀物             0.65                  大肠杆菌                                 0.45(网格)
纯化过滤                     1                       总细菌计数                             0.2
去除颗粒物                 5                       组织培养基              
水中微生物分析                                  去除支原体                             0.1
细菌计数                     0.45(网格)  灭菌过滤                                 0.2

英国Whatman沃特曼Cellulose Membranes纤维素滤膜 

订货信息-硝酸纤维素膜
尺寸(mm)            孔径(μm)           目录号                     数量/包
WCN
13                              0.2                           7182-001                100
13                              0.45                         7184-001                100
25                              0.2                           7182-002                100
25                              0.1                           7181-002                100
25                              0.45                         7184-002                100
25                              0.65                         7186-002                100
25                              0.8                           7188-002                100
25                              1.0                           7190-002                100
25                              3.0                           7193-002                100
25                              5.0                           7195-002                100
37                              0.45                         7184-003                100
37                              0.8                           7188-003                100
47                              0.1                           7181-004                100
47                              0.2                           7182-004                100
47                              0.45                         7141-004                100
47                              0.45                         7141-104                100
47                              0.45                         7141-114                100
47                              0.45                         7141-204                100
47                              0.45                         7141-124                200
47                              0.45                         7141-154                1000
47                              0.45                         7184-004                100
47                              0.65                         7186-004                100
47                              0.8                           7188-004                100
47                              1.0                           7190-004                100
47                              3.0                           7193-004                100
47                              5.0                           7195-004                100
82                              0.45                         7184-008                25
90                              0.2                           7182-009                25
90                              0.45                         7184-009                25
90                              0.8                           7188-009                25
90                              1.0                           7190-009                25
90                              5.0                           7195-009                25
142                            0.2                           7182-014                25
142                            0.45                         7184-014                25
293                            0.45                         7184-029                25

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