2. Dye Reagents

Dye Reagents

A dye is a colored substance that has an affinity to the substrate to which it is being applied.

A new approach is presented for analysis of microplastics in environmental samples, based on selective fluorescent staining using Nile Red (NR), followed by density-based extraction and filtration. The dye adsorbs onto plastic surfaces and renders them fluorescent when irradiated with blue light. Fluorescence emission is detected using simple photography through an orange filter. Image-analysis allows fluorescent particles to be identified and counted. Magnified images can be recorded and tiled to cover the whole filter area, allowing particles down to a few micrometres to be detected. The solvatochromic nature of Nile Red also offers the possibility of plastic categorisation based on surface polarity characteristics of identified particles. This article details the development of this staining method and its initial cross-validation by comparison with infrared (IR) microscopy. Microplastics of different sizes could be detected and counted in marine sediment samples. The fluorescence staining identified the same particles as those found by scanning a filter area with IR-microscopy.

Cyanine dyes can be used to quantify the amount of dsDNA within a sample. The linearity of fluorescence, as function of DNA amount of six dyes, is obtained by measuring the fluorescence intensity at the optimal excitation and emission maxima.

Dye Reagents (3280):

Cat. No. Product Name CAS No. Purity Chemical Structure
  • HY-D2703
    Cy7.5 HA biotin (MW 5000) 98%
    Cy7.5 HA biotin (MW 5000) is a biotinylated hyaluronic acid labeled with CY7.5 (HY-D0926). Cy7.5 HA biotin (MW 5000) is widely used for cell imaging and in vivo imaging of shallow tissues (Ex/Em = 770/820 nm).
    Cy7.5 HA biotin (MW 5000)
  • HY-D2704
    Cy7.5 HA biotin (MW 10000) 98%
    Cy7.5 HA biotin (MW 10000) is a biotinylated hyaluronic acid labeled with CY7.5 (HY-D0926). Cy7.5 HA biotin (MW 10000) is widely used for cell imaging and in vivo imaging of shallow tissues (Ex/Em = 770/820 nm).
    Cy7.5 HA biotin (MW 10000)
  • HY-D2705
    Cy3 Dextran (MW 2000) 98%
    Cy3 Dextran (MW 2000) is a fluorescent labeling reagent that combines Cy3 (HY-D0822) fluorescent dye and Dextran (HY-112624). The Cy3 fluorophore is commonly used in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Dextran has an inhibitory effect on thrombocyte aggregation and coagulation factors and is used as a plasma volume expander (Ex/Em = 550/570 nm).
    Cy3 Dextran (MW 2000)
  • HY-D2707
    Cy3 Dextran (MW 5000)
    Cy3 Dextran (MW 5000) is a fluorescent labeling reagent that combines Cy3 (HY-D0822) fluorescent dye and Dextran (HY-112624). The Cy3 fluorophore is commonly used in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Dextran has an inhibitory effect on thrombocyte aggregation and coagulation factors and is used as a plasma volume expander (Ex/Em = 550/570 nm).
    Cy3 Dextran (MW 5000)
  • HY-D2710
    Cy3 Dextran (MW 40000)
    Cy3 Dextran (MW 40000) is a fluorescent labeling reagent that combines Cy3 (HY-D0822) fluorescent dye and Dextran (HY-112624). The Cy3 fluorophore is commonly used in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Dextran has an inhibitory effect on thrombocyte aggregation and coagulation factors and is used as a plasma volume expander (Ex/Em = 550/570 nm).
    Cy3 Dextran (MW 40000)
  • HY-D2711
    Cy3 Dextran (MW 100000) 98%
    Cy3 Dextran (MW 100000) is a fluorescent labeling reagent that combines Cy3 (HY-D0822) fluorescent dye and Dextran (HY-112624). The Cy3 fluorophore is commonly used in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Dextran has an inhibitory effect on thrombocyte aggregation and coagulation factors and is used as a plasma volume expander (Ex/Em = 550/570 nm).
    Cy3 Dextran (MW 100000)
  • HY-D2712
    Cy3 Dextran (MW 500000) 98%
    Cy3 Dextran (MW 500000) is a fluorescent labeling reagent that combines Cy3 (HY-D0822) fluorescent dye and Dextran (HY-112624). The Cy3 fluorophore is commonly used in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Dextran has an inhibitory effect on thrombocyte aggregation and coagulation factors and is used as a plasma volume expander (Ex/Em = 550/570 nm).
    Cy3 Dextran (MW 500000)
  • HY-D2729
    Cy3-NO2-Tre 3012597-48-4
    Cy3-NO2-Tre is a nitroreductase-responsive cyanine-based fluorescent probe that specifically labels Mycobacterium tuberculosis (Mtb). Cy3-NO2-tre generated fluorescence after activation by a specific nitroreductase, Rv3368c, which is conserved in the Mycobacteriaceae. Cy3-NO2-tre effectively imaged mycobacteria within infected host cells, tracked the infection process, and visualized Mycobacterium smegmatis being endocytosed by macrophages (Ex/Em= 540-550/575-625 nm).
    Cy3-NO2-Tre
  • HY-D2731
    Cy3-NO2 98%
    Cy3-NO2 is a cyanine-based probe. Cy3-NO2 can be excited by using a 554 nm laser and filtered with a 568 nm laser.
    Cy3-NO2
  • HY-D2732
    NFC nitro probe 1 1604838-69-8 98%
    NFC nitro probe 1 (compound 18) is an NFC termed probe for Mtb detection. NFC nitro probe 1 (compound 18) shows high potency for R-Mtb and NR-Mtb.
    NFC nitro probe 1
  • HY-D2733
    N14G 98%
    N14G is a fluorescent dye that can be used to stain bacteria such as Mycobacterium tuberculosis.
    N14G
  • HY-D2736
    BP Light 800 NHS ester 2131095-32-2 98%
    BP Light 800 NHS ester is an amine reactive hydrophilic fluorochrome . It can be conjugated to antibody with higher D/P ratio and widely used applications including western blotting, microscopy, flow cytometry, and cell based assays.
    BP Light 800 NHS ester
  • HY-D2737
    DMT-BH2 amidite 374591-98-7 98%
    DMT-BH2 amidite (BHQ-2 DMT amidite) is a black quencher dye for the synthesis of dual-labeled oligonucleotide probes for qPCR bearing 5'-quencher. This quencher is ideal for HEX, JOE, ROX, Cyanine5, and other dyes with emissions in the orange and red parts of the spectrum.
    DMT-BH2 amidite
  • HY-D2738
    BP Fluor 532 NHS ester 2791287-15-3 98%
    BP Fluor 532 NHS ester is an amine reactive, yellow-emitting dye routinely used to label proteins or antibodies through primary amines (Lys), amine-modified oligonucleotides, and other amine-containing biomolecules. The labeling occurs most efficiently at pH 7-9 and forms a stable, covalent amide bond. BP Fluor 532 is a bright yellow-fluorescent dye with pH insensitive emission from pH 4 to pH 10. The excitation of BP Fluor 532 is ideally suited for the frequency-doubled Nd:YAG laser line. BP Fluor 532 can be conjugated to a variety of antibodies, peptides, proteins, tracers, and amplification substrates, and is often used for the generation of stable signals in imaging and flow cytometry.
    BP Fluor 532 NHS ester
  • HY-D2739
    SIMA phosphoramidite, 6-isomer 1411797-05-1 98%
    SIMA phosphoramidite, 6-isomer is a xanthene dye with spectral characteristics similar to those of HEX but with a higher quantum yield. SIMA has higher stability during deprotection under alkaline conditions.
    SIMA phosphoramidite, 6-isomer
  • HY-D2740
    ROX azide, 6-isomer 1422178-12-8 98%
    ROX azide, 6-isomer is an alkyne-reactive derivative of ROX (Rhodamine X, Rhodamine 101) dye. ROX is a red-emitting fluorophore possessing high brightness and fluorescence quantum yield. This reagent is a pure 6-isomer. It is used for labeling alkyne and cycloalkyne-containing biomolecules via copper-catalyzed and copper-free click chemistry reactions.
    ROX azide, 6-isomer
  • HY-D2741
    MB 488 NHS ester 2766408-55-1 98%
    MB 488 NHS ester is a fluroescent agent with a terminal NHS ester group. MB 488 NHS ester is a green fluorescent, very hydrophilic dye molecule that has a maximal absorption of 501 nm and emission at 524 nm. The NHS ester can be applied to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules.
    MB 488 NHS ester
  • HY-D2743
    ROX alkyne, 6-isomer 2097422-22-3 98%
    ROX alkyne, 6-isomer is an alkyne derivative of the bright red-emitting dye ROX (Rhodamine X, Rhodamine 101). Due to its quantum yield approaching unity, ROX is a popular dye for qPCR and microscopy applications. It is used for fluorescent labeling of azide-containing biomolecules via copper-catalyzed click reaction.
    ROX alkyne, 6-isomer
  • HY-D2744
    BP Fluor 488 TCO 2766559-05-9 98%
    BP Fluor 488 TCO reacts with tetrazines to produce a stable, covalent linkage, also referred to as the inverse-electron demand Diels-Alder cycloaddition reaction. This reaction is extremely fast (k > 800 M-1 s-1), selective, biocompatible, and does not require Cu-catalyst or elevated temperatures. Such excellent reaction rate constants are unparalleled by any other bioorthogonal reaction pair described to date.
    BP Fluor 488 TCO
  • HY-D2745
    BP Fluor 594 NHS ester 1638544-48-5 98%
    BP Fluor 594 NHS ester is the most popular tool for modifying proteins or antibodies through the primary amines (Lys), amine-modified oligonucleotides, and other amine-containing biomolecules with BP Fluor 594 label. The labeling occurs most efficiently at pH 7-9 and forms a stable, covalent amide bond. BP Fluor 594 dye can be used for proteins labeling at high molar ratios without significant self-quenching, enabling brighter conjugates and more sensitive detection. BP Fluor 594 is bright, water-soluble, and pH-insensitive from pH 4 to pH 10 red-fluorescent dye with absorption and emission maxima at 590 and 617 nm, respectively. It can be used with the 561 nm and 594 nm laser lines. BP Fluor 594 dye conjugated to a variety of antibodies, peptides, proteins, tracers, and amplification substrates often used for generation of stable signal in imaging and flow cytometry.
    BP Fluor 594 NHS ester