The benefits of syringe filters in preparing organic and aqueous solutions for testing is that they are disposable and sterile. The construction of syringe filters offers sterile housing for separated solutions, where outside contamination could otherwise drastically skew results. The ability to efficiently filter such solutions cuts costs and ensures only uncontaminated samples are used for testing.

Tisch is the leader in separations technology for the life sciences and one of the top producers of disposable syringe filter product lines. Tisch disposable syringe filters are composed of either a polypropylene or polycarbonate housing and are heat-sealed prior to shipment, ensuring a sterile container for solution filtration and preparation. This also ensures that the container itself will not interfere with the compound to be tested.

Whether purchasing Tisch syringe filters for a chemistry lab or replenishing commercial lab supplies, dealing with a reputable and trustworthy supply distributor is ideal. Tisch Scientific, one of the largest distributors of syringe filters, has offered clients timely delivery and competitive pricing for only the highest quality supplies since 1954. Tisch sells the full line of Whatman and Tisch syringe filters, including the Anotop® model, and offers reduced annual pricing for both small and bulk orders. They also are very resilient, catering to the specific needs of any particular laboratory by offering brand names you know and trust for any supply you may need.

If you work in a laboratory, it is a safe bet that you will need to stock syringe filters, as well as other essential supplies. Supplies and the work they produce are not cheap, so choosing the right equipment needs to be an intelligent investment. You don’t have to be a scientist to know that when you order supplies you trust, you trust your results. The Tisch syringe filter model is an essential laboratory supply that you can use across a broad spectrum of work and trust to give your laboratory uncontaminated results. You can acquire the Tisch Syringe Filter Model, along with all your laboratory supplies, with the utmost confidence through www.scientificfilters.com.

Product Description

Quartz fiber filters are made of very pure quartz fibers with no binders and glass fibers. The pure quartz composition prevents the filters from reacting with acidic gases, unlike glass fiber filters that can react and cause false readings. This makes quartz filters well suited for measuring heavy metal concentrations and small amounts of particles. Because of the low level of alkaline earth metals, ‘artifact’ products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated. Quartz fiber filters are used for air sampling in acidic gases(except HF), stacks, flues and aerosols, particularly at high temperatures and in PM-10 testing as well as where absolute purity of the filter medium is required. The filters also exhibit good weight and form stability.

Best procedures within caring for your membrane filtering method

 membrane installations were staying commonplace within the 1990s, the technique had been unknown and expensive to cities and utilities in the U.S. Ever since then, nonetheless, this technology is growing profoundly way more cost-competitive with traditional treatment, and plant owners and operators become more well-informed and informed about the ideal procedure of membranes.

Membrane technology compared to different treatment technology, however, is unique because the filters sacrifice their existence and high quality although treating h2o on the exact same regularly high levels. Therefore, membrane replacement and the expenses related to it are a prevalent reality when working with membrane technology.

An issue meant for municipalities is how much time their systems can last and how much it’ll cost you to replace the necessary equipment. Membrane substitute attributes the majority of functioning and maintenance () charges for membrane techniques. Over the 20-year task life cycle, equipment charges may make up the principle fee for membrane systems. Treatment equipment (not including the specific membranes) typically makes up about half of the life-cycle expense. First membrane purchase and membrane replacement mixed typically account for about one-third of life-cycle cost. Energy and compound costs usually account for about 10% of membrane life-cycle costs.

The Membrane Engineering Association projects that a well-designed reverse osmosis (RO) or nanofiltration (NF) system can last five to 10 years with proper handling and care; a microfiltration (MF)/ultrafiltration (UF) system?s life expectancy is seven to 10 years.

Prevention & Pretreatment

The MTA makes many recommendations to plant operators who use membranes on how to keep membranes running smoothly and as long as possible. Users of membranes?especially RO/NF technology?need to be aware that RO/NF is great for desalination and ion removal but can run into trouble when used to treat water with greater turbidity, particulate matter and solids.

A utility should strongly assess its source water supply on site before deciding on the particular membrane system. Measuring parameters such as microbial activity, total organic carbon, total suspended solids, temperature and pH?not just snapshots, but historical data as well?is critical in understanding incoming water quality.

Conductivity measurement is a critical parameter in an RO system. Conductivity measurements provide an indication of system efficiency and can be used to trigger an alarm condition when product quality or percent rejection decreases indicate a problem. A number of conductivity controllers specifically target the RO industry.

Pretreatment is usually needed for turbidity reduction, iron or manganese removal, stabilization of the water to prevent scale formation, microbial control, chlorine removal (for certain membrane types) and pH adjustment. This will reduce and prevent fouling of the membrane.

An effective example is gravity filter pretreatment, which helps eliminate membrane fouling by removing biological solids and turbidity, which in turn reduces physical deposits and trapped particles. It can consistently remove solids so the membranes can perform efficiently. The filter media will remove particulate material prior to the effluent being fed to the RO membrane system.

Prior to initiating the design of an MF or UF treatment facility, a pilot plant study would most likely be necessary to determine the best membrane to use, particulate/organism removal efficiencies, cold and warm water flux, the need for pretreatment and fouling potential. The results of a pilot study will help plant officials and operators better understand the membrane system?s life cycle and potential future costs.

It is actually suggested that functions and municipalities who are opting to install a membrane treatment system carefully examine warranties from the manufacturer. They may also want to inquire about the membrane?s permeability. Membrane permeability is a membrane?s ability to pass water relative to the applied pressure. When measured, it can indicate the membrane?s fouling rate. Permeability can identify when problems such as tightening of the membrane, fouling, scaling or loss of flow are occurring.

Enough good cannot be said of having an attentive and educated staff to closely monitor a utility?s system at all times, especially the pre- and post-treatment parts of membrane systems. These actions alert plant operators to impending problems so they can act quickly to prevent damage. Early detection of changes in a utility?s source water is also an important key to successful plant operation. Staff should have access to proper tools and equipment to fix problems and conduct tests and inspections.

Learning from Others

Fortunately, with the large influx of membrane installations that has occurred over the past 10 years in the U.S., there is a wealth of information, including case histories, workshops and technical experts, which can supply knowledge about the technology and solutions.

Finally, an always effective method of learning about pretreatment and methods of preventing fouling and scaling is through training seminars and workshops that are held across the country each year.

Nylon Syringe Filter (Polyamide)
Hydrophilic  properties
No pre-wetting needed
Uniform aperture
Strong tenacity and adsorbability
Compatible with aqueous and alcoholic solutions and solvents;suitable for HPLC

MCE Syringe Filter (Mixed Cellulose Ester)
Uniform aperture
No medium dropping
Naturally hydrophilic

CA Syringe Filter (Cellulose Acetate)
Low protein binding
Ideal for aqueous, biological or protein filtration
Naturally hydrophilic

PES Syringe Filter (Polyether Sulfone)
Hydrophilic, low protein binding
Low extractables
High throughput

PVDF Syringe Filter (Polyvinylidene Fluoride)
Good heat endurance and chemical stability
Strong hydrophobicity
Widely used in gas filtration, vapor filtration, high-temperature filtration

PP Syringe Filter (Polypropylene)
Hydrophilic membrane
Wide range of chemical compatibility to organic solvents
Highly solvent resistant
Low no-specific absorbing membrane for maximum protein recovery in critical analysis

PTFE Syringe Filter (Polyfluortetraethylene)
Broad chemical compatibility
Strong chemical stability and inertia
Strong hydrophobicity (available with hydrophilic membrane)

Glass Fiber Syringe Filter
Hydrophilic material membrane
Excellent compatibility with organic solvents, strong acids and bases. (not compatible with hydrofluoric acid)
High dirt-handling capacity

Membrane filtration is used to separate liquid from the contaminated particles for the purpose of purifing it. From filtering milk for cheese production as well as treating waste water, the application are close to infinite . No matter what the application, the purpose still remains which is to create a filtered solvent. Scientific Membrane filter technology has separated itself recently, since it is most used with chemicals. Membrane filters hava a small energy use and function really efficiently when used for system conductions. Membrane filter technology basicallyfocuses on characteristic segregation . Being of the unaltered type , these processes each put into practice a membrane and Membrane filtration. In addition, Membrane filtration is also associated with the operation of creating potable and usable water from wastewater, groundwater, or surface water. still , more disputable methods are being utilized for established techniques. The criterion within the process of membrane filteration is based upon the Formal propinquity of a semi-permeable membrane. The operation itself is basedd on a specific filter which allows water to move while it catching other substances or suspended solids. There are still some procedures which permit those substances to progress through the membrane filters. With the application of elevated pressure, the substances will proceed through the membrane filter or when a concentrated gradient is maintained on both sides of the membrane. predetermined substances are capable to move onwards through the membrane filters as the membrane only occupies a exacting separation wall which allows some particulate to proceed while trapping others. 
variant to flocculation, membrane filters are many times used for residue purification, for adsorption methods such as for filtration of sand, ion exchangers, or active carbon filters and the eradication of distillation. The Membrane filtration technique is affected by just two factors. The primary is selectivity. The number two factor is productivity. The fracturing factor or retention, as it is sometimes called, is the parameter of selectivity while the parameter for productivity is referred to as flux and both are dependent upon the membranes. 
The sub categories of membrane filters are radical filtration and the micro filtration. In addition, there is also reverse osmosis or hyper filtration and nano filtration. Removing larger is performed by thorough filtration and micro filtration because of small force differences and superior productivity. For extracting salts from water, reverse osmosis or nano filtration are utilized. This practice requires much higher pressures while the productivity is much lower for both nano filtration as satisfactorily as reverse osmosis. For water purifity, the use of Membrane filtration offers numerous benefits over other procedures. This activity is capable to be performed with small temperatures which allows it to treat heat-sensitive matter uniquely in the foodstuffs industry. This approach also requires low energy costs in contrast with the elevated expenditure processes such as evaporation. So whether it be laboratory methods, sampling study , water purifying, or the food processing, Membrane filtration offers a vastly secure , operative and effective substitute .

Sterile filtration devices, such as vacuum cups and syringe filters, are used throughout the life science research laboratory for a variety of routine yet critical applications. Among these are the clarification of biological samples and the sterilization of tissue culture media, additives and buffers. These membrane devices are available with a number of different membranes, but in recent years there has been substantial growth in the use of polyethersulfone (PES). These membranes are unique in their combination of fast flow, high throughput, and low protein binding. This article describes the development of a new-generation PES membrane providing flow rates that are higher still. This discussion will also compare the flow rates and protein binding performance of this new membrane to those of others in applications such as tissue culture media filtration.

Tissue culture techniques are ubiquitous throughout life science research. Life-science professionals, including cancer researchers, virologists, immunologists, cell biologists, and pathologists, to name a few, cultivate animal cells or microbes in vitro. Their objectives are to study cell morphology, growth, and regulation in normal and disease states, or to understand the effects that environmental stresses (such as drugs and toxins) can have on cells. In addition, scientists grow cells in order to harvest cell contents or by-products, such as monoclonal antibodies, enzymes, or the viral components used in vaccine production. This harvesting application has evolved from research scale applications, to form the basis for the biotechnology industry, which produces commercial quantities of therapeutic compounds by means of tissue culture.

Cell culture requirements

To allow cells to grow properly, the researcher must create an environment in vitro that simulates the conditions that cells normally encounter in vivo. This requirement includes maintaining the proper temperatures and pH levels, as well as the appropriate concentrations of key dissolved gases such as oxygen and carbon dioxide. Culture media represent a critical component that provides not only the nutrients on which the cells feed, but also their physical environments (usually liquid). Additives (such as growth factors, hormones, antibiotics, and vitamins) are used to further refine the growth conditions, supplement the nutrients, and prevent the growth of microbiological contamination. The sterility of the growth media is vital to ensure that microbial contamination does not adversely affect the growth of the target cells or compromise their optimal environments. Given the time- and labor-intensiveness of the cell culture process, many researchers believe that the insurance provided by sterile filtration (even for pre-sterilized media) is well worth the cost.

Culture media can be formulated by the users in the lab or purchased, being commercially available in several forms including sterile ready-to-use liquids, liquid concentrates, and powders. These media can be complex, often containing proteins, antibiotics, and other components. Serum (usually bovine or fetal calf-derived) is a proteinaceous, blood-based solution found in many mammalian cell culture media. Some proteins and other key ingredients found in media are heat-sensitive. Consequently, sterilization by autoclave is not an option. Sterilization by 0.22 μm membrane filtration has become an important part of media preparation, ensuring the sterility of the media while preserving the activity of key ingredients. In addition to being certified to remove bacteria, these filtration devices must be non-cytotoxic (as determined by a USP-specified MEM elution test), and non-pyrogenic (also as USP-specified).

Membranes and devices made with 0.22 μm cellulosic materials (such as cellulose nitrate, cellulose acetate, and mixed esters) were the first to be used in these applications, and are still in use today. However, these membrane materials have three principal drawbacks: low flow rates, low throughput (the volume of fluid that can permeate a filter before it clogs), and high protein binding. Other membrane materials were later tried which could solve some but not all of these problems. Nylon provides higher flow than cellulosic media but is also highly binding. Polyvinylidene difluoride (PVDF) has low protein binding but has lower flow rates than cellulosics. PES was the first polymer type to offer the desired combination of a high flow rate, high throughput, and low protein binding.

PES performance and upgrade

Protein binding is another property of membrane filters that contributes to reduced flow and premature clogging. In binding non-specifically to membrane surfaces, proteins reduce the available filtration areas, thereby increasing hydraulic resistance. In some cases, this phenomenon cascades and blocks off most or all of the liquid flow through the membrane, and a second filtration device is required to finish the job.

Summary

PES membranes have dramatically improved the productivity and speed of sterilization by filtration in the life sciences laboratory, particularly for protein-containing or other difficult-to-filter solutions. The features of high flow rate and throughput, combined with low protein binding, offer a convenient, economical, and high-quality way to ensure the sterility of media, buffers and additives in critically important mammalian and microbial cell culture applications

In environmental, life science and even bioscientific and applications, the most common sizes available are 0.2 or 0.22 um and 0.45 um pores. These sizes are sufficient for HPLC use . Our smallest syringe filter membrane is made of PES or Polyethersulfone of with pore size 0.02um. Membrane filters within the syringe filters diameters of 10 mm, 13 mm, 25 mm are everyday as well.

Safety proper to all Syringe Filters used with membrane filtration

Syringe use can result in elevated pressure . The smaller the syringe, the higher the pressure that can be generated. As a widespread guide, the following pressures can be obtained by hand with the syringes indicated:
* 20 ml-2 bar (30 psi)
* 10 ml-3.4 bar (50 psi)
* 5 ml-5.2 bar (75 psi)
* 3 ml-6.9 bar (100 psi)
* 1 ml-10.3 bar (150 psi)
particular users should determine the pressure they generate by hand with a specific measurements syringe and take suited safety precautions not to go beyond the recommended rating for the apparatus used. If the limitations are exceeded, the mechanism may rupture .

We offer a full line of throw-away syringe filter devices constructed to bring swift and effectual filtration of both aqueous and organic solutions. These are designed with a wide variety of membrane filters and possess a polypropylene or polycarbonate housing using the most technologically advanced membrane filtration methods available today. Our syringe filters are built using heat sealing without the use of glues or other sealants.Truely our syringe filters are ideal for tremendously wide array of applications in such fields as environmental, biotechnology, foodstuffs /beverage, and agricultural testing laboratories.

Using Syringe Filters

1) The solution to be filtered should be filled in the syringe

2) secure the syringe to the lure lock inlet of the syringe filter with a rotating motion.

3) With the outlet directed upward, evenly apply force to the syringe plunger to initiate flow.

4) Continue applying force until all the air space in the syringe filter is displaced with liquid.

5) Once liquid starts to exit syringe filter outlet, discontinue applying pressure. Point the apparatus downward and away from operator .

6) Direct the syringe filter flow over a collecting container and utilize pressure again in order to filter the sampling . switch filters when flow becomes too gradual or when resistance becomes excessive.

Tips:
1) Air locks will severely hinder flow rates. To decrease the possibly of an air lock, point the outlet of the filter instrument upward during the inception of liquid flow.

2) To fulfil an precise bubble point it will be imperative to flush the syringe filter with a minimum of 50ml of testing fluid. This ensures that the air is removed from the apparatus . After the filter is thoroughly dampened and with the exit is in the downward pointed position, employ controlled air pressure to the inlet until air breaks through the filter and bubbles can be detected exiting the exit . The compression at which air passes through the wetted filter is called the Bubble Point.

3) When looking at the unique factors of your application, consult the detailed data to determine correctness of use. at no time go beyond the
specified pressure or solution temperature. unexceptionally abide by the chemical compatibility recommendations. elevated pressures can be obtained when using syringes. Remember that the smaller the syringe the higher the pressure that can be obtained. As a usual guideline, the following pressures can be obtained
by hand with the syringes:
20 mL: 80 psi
10mL: 140 psi
5mL: 180 psi
3mL: 200 psi
1mL: 250 psi
Each operator should determine the pressure that they can generate by hand with a specific size syringe and take proper safety precautions so as to not go beyond the recommended ratings. surpassing these recommendations can cause the instrument to rupture resulting in loss of specimen or personal harm .

Scientific Filters

Doubles the volume of sample filtered compared with other conventional filters Extends filter life and reduces costly exchanges Increase flow rates
GD/X syringe filter.
Ordering information
Also available in 1500 pack. Other membranes, pore sizes, and diameters
available.
Technical specification – GD/X and GD/XP
Filtration area: 25 mm: 4.6 cm²
Maximum pressure: 25 mm: 5.2 bar (75 psi) at 20°C
Materials of Housing: Polypropylene
construction: Filtration media: As specified
Hold-up volume: 25 mm: Full housing: ~ 1.4 ml
With purge: ~ 250 ìl
Connectors: Inlet: Female Luer
Lock (FLL)
Outlet: Male Slip Luer
(MSL)
Flow direction: Flow from inlet to outlet (FLL to MSL)
Sterilization: Can be autoclaved at 121°C for 20 min
at 1 bar
GD/XP Syringe Filters
Whatman GD/XP disposable Syringe filters are
designed for use with hard-to-filter samples that
require inorganic ion analysis, as levels of ion
extractables are minimized. GD/XP syringe filters
contain a two-layer prefilter stack comprised of
20 ìm and 5 ìm polypropylene filters. The last stage
of filtration is a choice of membrane, which is
positioned below the prefilter stack.
Features and benefits
• Similar to GD/X Syringe Filters
• Low level of ion extractables minimizes sample
contamination
Applications
• HPLC sample preparation for hard-to-filter samples
• Sample preparation prior to dissolved heavy
metals analysis
Related products
Polydisc™ GW and Polycap™ GW have been developed
for the preparation of larger volumes of groundwater
samples for the analysis of dissolved heavy metals.

Safety: When considering the special factors of
your application, consult the Technical Data to
determine correctness of use. Do not exceed the
pressure, temperature or chemical compatibility
recommendations. High pressures can be obtained
when using syringes. The smaller the syringe the
higher the pressure that can be generated. As a
general guide, the following pressures can be obtained
by hand with the syringes indicated: 20 mL;
80 psi; 10mL, 140 psi; 5mL, 180 psi; 3mL, 200
psi; 1mL, 250 psi. Each user should determine the
pressure they can generate by hand with a specific
size syringe and take appropriate safety precautions
not to exceed the recommended rating for
the device used. If these limitations are exceeded,
bursting of the device may occur resulting in loss
of sample or personal injury.