www五月天婷婷I人成电影网I国产精品久久久久久一二三四五I91正在播放I免费网站黄色I久久久久免费视频I91色亚洲

sigma現(xiàn)貨代理Dispase II D-4693

Description

Analysis Note

The enzyme can be initially dissolved in 50 mM Hepes/KOH pH 7.4, 150 mM NaCl at 10 mg/ml. Further dilutions should be made in the cell culture media most appropriate for the cells being dissociated. Dispase is a metalloproteinase and is activated by divalent cations including Ca2⁺ , Mg2⁺, Mn2⁺ and Fe2⁺.

Preparation Note

A 50 U/mL stock solution may be prepared by dissolving the powder in a buffer containing 10 mM NaAc (pH 7.5) and 5 mM CaAc. It should be stored at 4 °C.

Unit Definition

One unit will hydrolyze casein to produce color equivalent to 1.0 μmole (181 μg) of tyrosine per min at pH 7.5 at 37 °C (color by Folin-Ciocalteu reagent), unless otherwise indicated.

Physical form

lyophilized powder containing calcium acetate and milk sugar

Application

The enzyme from Sigma has been used in developing a protocol for ex vivoculture of mouse embryonic mammary buds.^[5] It has been used in the treatment of rat heart pieces during the isolation of mitochondria from rat heart.^[6] It has also been used for the isolation of dental pulp stem cells (DPSCs) by enzymatic hydrolysis. These cells have been compared with DPSCs isolated by explant method to analyse their stem cell and differentiation properties.^[1]
Dispase II has been used for Fluorescence-Activated Cell Sorting (FACS).^[3] It has also been used for separating visceral yolk sac layers.^[2]

Biochem/physiol Actions

Dispase II is a neutral protease that hydrolyzes the N-terminal peptide bonds of non-polar amino acid residues. It may be used for separating many tissues and cells grown in vitro. The enzyme is very gentle and does not damage cell membranes. It can also be used to prevent clumping in suspension cultures. This protease cleaves fibronectin and type IV collagen, but not laminin, type V collagen, serum albumin, or transferrin.^[4] Dispase II is specific for the cleavage of Leucine-Phenylalanine bonds. Ca²⁺, Mg²⁺, Mn²⁺, Fe²⁺, Fe³⁺ and Al³⁺activate the enzyme. EDTA, EGTA, Hg²⁺ and other heavy metals inhibit the enzyme activity.^[7] The enzyme contains 1g-atom of zinc per g-mol of purified enzyme. If this zinc component is removed by chelating agents such as EDTA or EGTA, an inactive apoenzyme is obtained. The enzyme is not inhibited by serum.

sigma現(xiàn)貨代理Dispase II D-4693

我公司代理sigma公司試劑，大量現(xiàn)貨，和選購