Elisa kit small experience sharing: how to do improper sample preservation - Database & Sql Blog Articles

I often receive questions from students who ask us to order kits, saying that their samples were not stored properly. So what should they do? Today, I’ll walk you through the best practices for sample storage and how it affects your ELISA results. Improper storage of specimens in a refrigerator can cause issues, especially with long-term samples. For example, IgG in serum may polymerize into multimers, while AFP might form dimers. These changes can lead to high background signals or even false positives in indirect ELISA. If the sample is left for more than a day, the antigen or antibody activity might decrease, potentially resulting in false negatives. To avoid these problems, it's best to use freshly collected serum samples for ELISA. If immediate testing isn't possible, store the samples at 4°C for up to 5 days. For longer storage, cryopreservation at -20°C or -80°C is recommended. However, when thawing frozen samples, keep in mind that proteins may become concentrated or unevenly distributed. Always mix them gently after thawing—avoid vigorous shaking to prevent denaturation. Shanghai Xinfan Bio offers a wide range of high-quality ELISA kits, some of which are available in stock. Feel free to reach out for more details! Our main products include: - **ELISA Kits**: Imported and domestic ELISA kits for human, rat, and mouse samples. - **Media**: Microbial culture media, chromogenic media, BD, Gibco, and more. - **Serum**: Fetal bovine serum, human serum, animal serum, and premium brands like Hyclone and GIBCO. - **Biological Reagents**: Amresco, Sigma, ABM, BIO-RAD, BD, ABCAM, and other leading suppliers. - **Reference Substances**: Imported reference materials and standards. - **Antibodies**: Primary, secondary, and flow cytometry antibodies. - **Radioimmunoassay Kits**: Both imported and domestic options, including well-known brands like Phoenix. - **Laboratory Services**: Radioimmunoassay, WB, IHC, qPCR, histology, and biochemical tests. Whether you're a student, researcher, or lab professional, we’re here to support your needs with reliable reagents and expert guidance. Let’s make your experiments more accurate and efficient!

AC Power Supplies

AC power supply is a kind of power supply that converts the input mains or DC input into a pure sine wave output after AC-DC-AC or DC-AC conversion. The ideal AC power supply is characterized by stable frequency, stable voltage, zero internal resistance and pure sine wave output voltage wave (without distortion). Mainly used for power grid simulation tests conducted by various electrical appliance manufacturers on electrical appliances according to the voltage/frequency requirements of different countries, various AC motors, AC transformers, aircraft & mechanical equipment and other electronic devices that require pure, regulated and frequency-stabilized output.

Our AC power supply mainly includes three types
1. AC Power Supplies converting the input mains AC by AC-DC-AC, output voltage and frequency are stable and adjustable with pure sine wave output waveform, so called: Variable Frequency AC Power Supplies.
2. AC Power Supplies converting the DC output of the battery and other DC equipment by DC-AC, giving an AC sinusoidal output with stable output voltage and frequency. so called: Inversion AC Power Supplies.
3. AC Power Supplies converting the input mains AC by AC-DC-AC, giving a variable voltage AC output at constant 400Hz output frequency ultra-high output frequency stability. so called: Intermediate Frequency AC Power Supplies.
4. According to the difference in the number of output phases, the AC Power Supplies can be divided into single-phase output AC power supplies and three-phase output AC power supplies.
Different from Variac and AC voltage regulators, our AC power supplies support the setting of output voltage and frequency and has superior high precision, high stability, and high efficiency stable frequency AC output, not only for AC power conversion but also for AC high precision test purpose.

Through the friendly operation panel, you can read the output data such as output voltage, output current, output power, power factor, etc., providing accurate data records for your test, and can add RS485 interfaces as standard, following the MODBUS-RTU international communication protocol, which can realize remote control and operating status monitoring of the power supplies.

Our AC Power Supplies have comprehensive protection functions, such as: over voltage, over current, over temperature and short circuit protections, which can protect the AC power supplies and DUT from damages.

AC Power Sources, AC Sources, AC - AC Power Supplies, DC - AC Power Supplies, AC Switching Power Supplies

Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com