The suitability of this product for use on plastics has not been examined. Some types of plastics may not be compatible with the heptane solvent used to prepare this product. Please see the link below to review a publication regarding the use of SigmaCote on plasticware: https://link.springer.com/protocol/10.1007/978-1-61779-980-8_5#Sec7
SL2
Sigmacote®
siliconizing reagent for glass and other surfaces
Synonym(s):
chlorinated organopolysiloxane in heptane, siliconizing reagent for glass
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About This Item
UNSPSC Code:
41116121
NACRES:
NA.47
Pricing and availability is not currently available.
Recommended Products
biological source
synthetic
Quality Level
color
colorless
density
0.68 g/cm3
application(s)
hematology
histology
storage temp.
2-8°C
General description
Sigmacote® is a solution of a chlorinated organopolysiloxane in heptane that readily forms a covalent, microscopically thin film on glass. The film repels water, retards the clotting of blood or plasma, and prevents surface adsorption of many basic proteins. Ready to use without dilution; reusable if kept free of moisture.
Application
Biochem/physiol Actions
Sigmacote® is ideal for glass[3], ceramics and fiber optics. It is used to treat GC injection glass inserts.
Legal Information
Sigmacote is a registered trademark of Merck KGaA, Darmstadt, Germany
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Description
Pricing
Signal Word
Danger
Hazard Statements
Precautionary Statements
Hazard Classifications
Aquatic Acute 1 - Aquatic Chronic 1 - Asp. Tox. 1 - Eye Irrit. 2 - Flam. Liq. 2 - Skin Irrit. 2 - STOT SE 3
Target Organs
Central nervous system
Storage Class Code
3 - Flammable liquids
WGK
WGK 2
Flash Point(F)
24.8 °F - closed cup
Flash Point(C)
-4 °C - closed cup
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Isolation of adult stem cells and their differentiation to Schwann cells
Progenitor Cells, 47-57 (2012)
Comparative analysis of satellite DNA in the Drosophila melanogaster species complex
Jagannathan M, et al.
G3 (Bethesda, Md.), g3-116 (2016)
Analysis of protein S-acylation by gas chromatography-coupled mass spectrometry using purified proteins
Sorek, Nadav and Yalovsky, Shaul
Nature Protocols, 5(5), 834-834 (2010)
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Can Sigmacote be used to coat plastic containers that will be subjected to agitation (100 rpm) for at least 5 days, possibly longer? Will these conditions affect the integrity of the coating?
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How to best keep the solution moisture free upon opening bottle? Particularly if the solution has to be decanted in another container to allow coating of long glass capillaries, how badly it would be affected if is to be re-used. Any advice?
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The product should be stored in the bottle tightly capped when not in use. As the coating is nearly instantaneous, do not leave the product exposed to air longer than required. As an exact length of the capillary tubes was not stated, it is hard to know exactly how "long" it is. If the capillary tubes are a few centimeters long, it is probably easiest to submerge the capillary tubes in the product for a short period of time. If the capillary tubes are meters long, the product will need to be pumped or somehow run through the capillary tube. Once the coating is complete, return the product to the bottle(s). and tightly close the cap.
The Safety Data Sheet shows the active ingredient is dissolved in n-heptane.. Section 7 of the SDS does not listed the product as hygroscopic, although the Product Information Sheet does state that it will react with water and alcohols to form hydrochloric acid. Do not reuse the product if it turns cloudy or if water fails to bead on a dry glass surface that has been treated with it. As heptane is less dense than water, if water were to be absorbed, it might be possible to see water droplets at the bottom of the solution.
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Can Sigmacoat be used to coat glassware that will be used for organotypic brain slice cultures being treated with growth factors or is it toxic to the slices?
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Sigmacote (SL2) is not claimed to be cell culture grade. There is heptane present in the coating solution. The solution itself is not considered sterile. After coating the glassware with SL2, the glassware should be dried thoroughly. After drying, the glassware should be rinsed well in water to remove any remaining traces of heptane. To sterilize the glassware, it would be possible to use an autoclave with dry heat to sterilize the glassware. The Product Information Sheet states that autoclaving does provide a more durable coating.
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Approximately, how much Sigmacote would be required to coat a 500 mL vessel?
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The specific amount required has never been determined. In the coating procedure, Sigmacote is added to the glass container, swirled around to coat the glass surface, and then returned to the bottle. The detailed procedure is provided below:
Procedure:
1. The glass surface to be siliconized must be clean and dry.
2. Cover or immerse the glass surface in Sigmacote (undiluted). The reaction is almost instantaneous, and excess solution can be removed for reuse.
3. Allow the treated glass surface to air dry in a hood. No heating is required.
4. Rinse the siliconized articles with water to remove the HCl byproducts before use.Notes:
1.After the heptane has evaporated, the siliconized articles can be oven dried at 100°C for 30 minutes, resulting in a slightly more durable coating.
2. The siliconized coating can be removed with an overnight treatment using 10–20% (w/v) aqueous or alcoholic potassium hydroxide or sodium hydroxide solutions. The removal of the silicon coating can be monitored at various time intervals by rinsing the glass item and observing the "beading" or "sheeting" of water. It may also be possible to remove the coating by physical abrasion, such as scrubbing or vigorously brushing the glass surface. Autoclaving will not destroy the coating.
3. There are no claims regarding the effectiveness of Sigmacote on plastic surfaces. Also, some types of plastics may not be compatible with the heptane in this product.
4.In practice, Sigmacote is reused until the coating is determined not to be acceptable or the volume of reagent remaining is insufficient to coat the glass surface. To check whether the coating is effective, a drop of water or color solution can be added to the glassware. If the coating is effective, the water or color solution should bead. If the solution spreads out over the surface of the glass, the coating is no longer effective.Helpful?
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What is the bond strength of Sigmacote for glass and plastic? Would this product be suitable for create a surface for a 3D printing?
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Sigmacote (SL2) is primarily designed to prevent proteins and other negatively charged substances from binding to glass surfaces. There are no specific claims about its effectiveness in preventing proteins and other charged substances from binding to plastic. Regarding its use for a 3D printing application, there is no available data on file to determine whether Sigmacote would serve the intended purpose.
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Is the film created by Sigmacote safe to touch once the heptane has evaporated?
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Sigmacote contains product that has hazard warnings for skin corrosion and serious eye damage. Therefore, adequate precautions should be taken when handling either liquid. However, once the glassware has been coated and dried, there is no solvent or liquid present on the glass slide.
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After coating with Sigmacote SL2, how many times can a bioreactor or shaking flask be used?
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The number of times glassware can be reused after the initial coating with Sigmacote is not specified. A more durable coating may be achieved by heating the dried and coated product at 100°C for 30 minutes. The recommended approach is to clean and thoroughly dry the bioreactors and shaker flasks after coating with Sigmacote and then test the effectiveness of the coating using a colored aqueous solution. If the coating is intact, the colored solution should bead. If the solution does not bead over the entire surface of the bioreactor or shaker flasks, it means the coating is not intact, and the coating has to be stripped. After stripping the coating, Sigmacote may be reapplied.
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Can sigmacote efficiency be reduced by too much oxygenation (opening the bottle many times)?
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This product is not expected to be sensitive to oxygen and is recommended to be stored tightly closed in a dry and well-ventilated place, away from heat and sources of ignition at 2 - 8 °C. The active chlorinated organopolysiloxane component in this solution is sensitive to moisture and alcohol. It will react with water and alcohol to form hydrochloric acid (HCl). Do not reuse Sigmacote if it turns cloudy or if water fails to bead on a dry glass surface that has been treated with the solution.
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For our application, the coated material is to be cleaned regularly with HNO3 (up to 10%) or HCl (up to 10%), methanol (10%) or a mixture of HCl and methanol (7% and 10%). Is the coating stable against these chemicals, against acids in general?
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The long-term effects of acids or alcoholic acids have not been evaluated for this product. Typically, Sigmacote is removed by manual abrasion or an overnight treatment with 10-20% (w/v) aqueous or alcoholic potassium hydroxide or sodium hydroxide solutions. To monitor coated surfaces for degradation, add a drop of water or colored water, to the coated surface. If the drop spreads out, the coating has degraded. If the drop forms a well-defined bead, the hydrophobic coating is intact.
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Have you tried Sigmacote with polymeric materials such as PDMS or PCL?
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The suitability of Sigmacote with polymeric materials has not been determined. This product is a chlorinated organopolysiloxane in heptane used primarily to prevent protein adhesion. The reagent forms a covalent bond on glass surfaces - the chlorosilane ingredient reacts with the -OH group on the glass to form this linkage. The coating is very robust and does not degrade easily. It can be removed by treatment with alcoholic sodium hydroxide or abrasion. Compatibility with polymers such as PDMS and PCL would have to be tested and determined by the end user.
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