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670 phalloidin 鬼筆環(huán)肽 藍(lán)色熒光
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初級會員·13年
聯(lián)人:
曹女士
話:
400-6111-883
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4006-111-883
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86-21-34615995
址:
上海市浦東新區(qū)天雄路166弄1號3樓
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www.yeasen.com

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670 phalloidin 鬼筆環(huán)肽 藍(lán)色熒光 Fluorescent staining of fixed actin filaments in tissue sections and tissue culture cell preparations.Note: Unlike many actin antibodies, Acti-stain™ 670 phalloidin binds onl
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670 phalloidin 鬼筆環(huán)肽 藍(lán)色熒光

Product Uses Include
·                                 Fluorescent staining of fixed actin filaments in tissue sections and tissue culture cell preparations.Note: Unlike many actin antibodies, Acti-stain 670 phalloidin binds only to F-actin resulting in low background fluorescence. Furthermore, actin staining is not appreciably different between species.
·                                 Preparation of stabilized fluorescent actin filaments in vitro.
Actin staining is very useful in determining the structure and function of the cytoskeleton in living and fixed cells. The actin cytoskeleton is a very dynamic and labile structure in the living cell, but it can be fixed with paraformaldehyde prior to probing or staining for actin structures.
Material
Phalloidin is a seven amino acid peptide toxin from the mushroom Amanita phalloides, which binds specifically and with high affinity (Kd 20 nM) to the polymerized form of actin (F-actin). Phalloidin lowers the critical concentration of actin polymerization to less than 1 µg/ml, thereby acting as a polymerization enhancer. Phalloidin has been labeled with a proprietary far-red fluorescent dye which allows it to be used to stain actin filaments in tissue cultured cells and tissue sections (1, see Figure 1)?and cell-free preparations. Acti-stain 670 phalloidin-labeled actin filaments retain many functional characteristics of unlabeled actin including their ability to interact with myosin. Actin-stain 670 phalloidin is supplied as a red solid.
Note: Phalloidin is toxic and must be handled with care (LD50 human = 2mg/Kg).

Example Results and Specifications

Figure 1. Actin Stress Fibers stained with Acti-stain™ 670 in a Swiss 3T3 cell.

Figure 2. Emission and excitation scans for Acti-stain™ phalloidins







Mitotic Swiss 3T3 cell, F-actin stained with Acti-stain™ 670 (far-red, Cat. # PHDN1), nuclear DNA stained with Dapi (blue).

Absorbance and fluorescence scan of Acti-stain™ 670. Labeled phalloidin was diluted into methanol and its absorbance and excitation spectra were scanned between 300-750 and 600-750 nm, respectively. Absorbance peaks at 625 nm and fluorescence at 675 nm.

Acti-stain phalloidins are the most well characterized phalloidins available. Tabe 1 describes their brightness, photostability, background and affinity constants to F-actin. Compare these performance characteristics to other fluorescent phalloidins and you will see the advantages of using Acti-stain for your actin staining requirements.
Table 1. Biochemical characteristics of fluorescent phalloidins


Conjugate
Cat.#
Wavelengths (Ex/Em)
Brightness (AFU*)
Stability to photobleaching(half life in seconds**)
Background (% of total AFU at 100nM**)
Affinity (Kd in nanomolar)
Fluorescein-phalloidin
na
485/535 FITC filter set
432
6
22
72 +/-12
Acti-stain™ 488
PHDG1
485/535 FITC filter set
832
57
5
55 +/-8
Acti-stain™ 535
PHDR1
535/585 TRITC filter set
430
27
12
36 +/-7
Acti-stain™ 555
PHDH1
535/585 TRITC filter set
551
46
16
63 +/-8
Acti-stain™ 670
PHDN1
640/680 Cy5 filter set
332
8
18
50 +/-12


* = AFUs measured by quantitative cell imaging. ** = Measured in stained Swiss 3T3 cells in the absence of antifade.




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