Whatman 10406870, ME25/21 ST 0.45 um 47MM 100/PK

Whatman mixed cellulose ester membranes are composed of cellulose acetate and cellulose nitrate. These membranes are characterized by a smoother and more uniform surface than pure nitrocellulose Filters. Also, the color contrast provided by the Filter surface facilitates particle detection and minimizes eye fatigue. The ME range has a lower cellulose acetate content compared to the WME range of membranes.

In microbiological colony counting procedures, the color contrast between the surface and the colonies facilitates the counting process. Many microbiological techniques include colony counting after incubation as the standard method of quantitation. Whatman gridded Filters have clearly defined grid lines spaced at 3.1 mm or 5 mm intervals. The special ink used is nontoxic and completely free from bacterial growth inhibitors. Whatman black mixed cellulose esters are available plain for automatic colony counting applications, as well as gridded to assist in manual counting procedures. Black membranes provide contrast between residue or cell colors and the Filter without having to counter-stain the membrane.

Features:

• Sterile options available for critical applications.
• Excellent contrast for easier particle detection.
• Grids are nontoxic and do not inhibit bacterial growth, ensuring sample integrity.
• Black plain and black gridded membranes have a mix of cellulose nitrate and cellulose acetate.
• The membrane offers a high degree of internal surface area for greater adsorption of product.
• Higher dirt loading capacity.
• Biologically inert with good thermal stability.
• No surfactants to contaminate samples.
• Uniform microporous structure of membrane gives high flow rates.

Whatman混合纖維酯薄膜由醋酸纖維素和硝酸纖維素組成。這些薄膜比純硝酸纖維素濾器具有更平滑和更均勻的表面。此外，濾器表面提供的顏色對比有助於微粒檢測，減少眼部疲勞。ME系列的細胞膜醋酸纖維素含量低於WME系列。

在微生物菌落計數程序中，表面與菌落之間的顏色對比有助於計數過程。許多微生物學技術在孵育後包括菌落計數作為定量的標準方法。Whatman方格濾紙在每隔3.1毫米或5毫米間隔設有明確的網格線。使用的特殊墨水是無毒的，完全沒有細菌生長抑制劑。Whatman黑色混合纖維酯可用於自動菌落計數應用的平面和方格狀膜，也可用於手動計數程序。黑色膜在不必對膜染色的情況下提供殘留物或細胞顏色與濾紙之間的對比度。

功能：

• 可用於關鍵應用的無菌選項。
• 更易於檢測微粒的優異對比度。
• 網格為無毒的且不會抑制細菌生長，保證樣品的完整性。
• 黑色普通和黑色網格膜具有混合纖維素硝酸鹽和醋酸纖維素的混合物。
• 膜具有更高的內部表面積，可增加產品吸附量。
• 較高的污垢負載能力。
• 生物惰性，具有良好的熱穩定性。
• 無表面活性劑可污染樣品。
• 薄膜的均勻微孔結構可提供高流速。