Challenges and Demands in Fluorescent Microsphere Encoding Technology

Fluorescent microsphere flow analysis is a technology that uses fluorescently labeled microspheres for rapid, quantitative analysis in flow cytometry, enabling simultaneous measurement of fluorescence signals from multiple samples to obtain characteristic information about cells or particles. Current preparation methods involve adsorbing fluorescent dyes into monodisperse polystyrene microspheres, leveraging emission wavelengths and intensities for encoding, combined with techniques such as emulsion polymerization, sol-gel processing, or spray drying. These microspheres are widely used for multi-channel rapid analysis in biomedical testing, environmental monitoring, and food safety. However, traditional single-dye encoding systems offer limited encoding capacity, struggling to meet the growing demand for high-throughput, multi-parameter detection. Moreover, commercially available red-emitting dyes are primarily Cy dyes, whose poor stability and low fluorescence brightness significantly compromise microsphere performance.

Dual-Dye Encoding – A New Direction for Fluorescent Microsphere Technology

The current advancement in fluorescent microsphere technology is shifting from single fluorescent dyes to dual-dye systems. By adjusting dye encapsulation concentrations, dual encoding of wavelength and intensity can be achieved, greatly expanding encoding capacity and enabling the development of immunoassays and cellular analysis for multi-channel applications. Red-emitting fluorescent dyes are widely used in the field of fluorescent microspheres, yet the lack of high-performance dyes with excellent stability and brightness in this spectrum remains a key bottleneck limiting the preparation and application of dual-dye encoded microspheres.

EC640 and EC710 – High-Performance Red-Emitting Fluorescent Dyes

To address these challenges, Professor Yang Youjun's team, in collaboration with Bio-Vision Technology, has developed a series of high-performance fluorescent dyes with maximum absorption and emission wavelengths in the red spectrum—EC640 and EC710. These dyes are specifically designed for fluorescent microsphere encoding, effectively adsorbing into polystyrene microspheres while exhibiting excellent luminescent properties and non-aggregating characteristics, providing an ideal red-emitting choice for the stable preparation of dual-dye fluorescent microspheres.

Key Features and Application Value of EC640 and EC710

• High stability, high fluorescence brightness, and non-aggregating properties

• Excellent photostability, oxidation resistance, and resistance to biothiol addition

• Capable of crossing cell membranes with mitochondrial localization

Related Products：

EC640：

Can replace cyanine dyes CY5.5, APC (Bright), Alexa Fluor™ 647 (Brightest), eFluor™ 660, Atto 647, HiLyte™ 647, and others.

Fluorescence：λex 640 nm; λem 659 nm

Molar Extinction Coefficient：>130,000 cm ^-1M^-1

• 9372065 EC640-Br, 97%, Near-infrared fluorescent dye, liposoluble CAS:2920895-83-4
• 9372066 EC640-N3, 97%, Near-infrared fluorescent dye, liposoluble
• 9189157 EC640WS, 97%, Near-infrared fluorescent dye, water-soluble
• 9372068 EC640-WSN3, 97%, Near-infrared fluorescent dye, water-soluble

^EC710：

Can replace APC-A700 (Moderate-Bright), Alexa Fluor™ 700 (Dim-Moderate), and others for the development of high-performance fluorescent microspheres.

Fluorescence：λex 712 nm; λem 740 nm

Molar Extinction Coefficient：> 59,100 cm^-1M^-1

• 9372098 EC710-Br, 97%, Near-infrared fluorescent dye, water-soluble
• 9372099 EC710-N3, 97%, Near-infrared fluorescent dye, water-soluble
• 9372100 EC710-WS, 97%, Near-infrared fluorescent dye, water-soluble
• 9372101 EC710-WSN3, 97%, Near-infrared fluorescent dye, water-soluble

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