iFluor® 350 maleimide

iFluor® 350 Maleimide is a blue-fluorescent dye with a maleimide group for selective, covalent labeling of proteins and other biomolecules in fluorescence-based research applications.

Maleimide Functional Group: Enables conjugation to thiol groups including cysteine residues.
Spectral Properties: Excitation at 345 nm and emission at 450 nm.
Fluorescence Performance: Bright, photostable fluorescence with minimal quenching.
Spectral Compatibility: Similar to AMCA and Alexa Fluor® 350.
Applications: Suitable for fluorescent conjugation of thiol-containing proteins and antibodies.

<p>HeLa cells were stained with mouse anti-tubulin followed by iFluor 350 goat anti-mouse IgG (H+L).</p>

Protocol

SDS

Catalog	Size	Price	Quantity
1060	1 mg	Price

Overview

AAT Bioquest's iFluor® dyes are optimized for labeling proteins, particularly antibodies. These dyes are bright, photostable, and have minimal quenching on proteins. They can be well excited by the major laser lines of fluorescence instruments (e.g., 350, 405, 488, 555, and 633 nm). iFluor® 350 dyes have fluorescence excitation and emission maxima of ~345 nm and ~450 nm respectively. These spectral characteristics make them an excellent alternative to AMCA and Alexa Fluor® 350 labeling dye (Alexa Fluor® is the trademark of Invitrogen). iFluor® 350 maleimide is reasonably stable and shows good reactivity and selectivity with the thiol group.

Calculators

Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of iFluor® 350 maleimide to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

	0.1 mg	0.5 mg	1 mg	5 mg	10 mg
1 mM	281.421 µL	1.407 mL	2.814 mL	14.071 mL	28.142 mL
5 mM	56.284 µL	281.421 µL	562.841 µL	2.814 mL	5.628 mL
10 mM	28.142 µL	140.71 µL	281.421 µL	1.407 mL	2.814 mL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)		Molecular weight		Volume (Calculate)		Concentration (Calculate)		Moles
mg	÷	355.34 g/mol	=	mL	x	mM	=	mmol

Citations

View all 3 citations: Citation Explorer

Deep Sequencing Analysis of the Eha-Regulated Transcriptome of Edwardsiella tarda Following Acidification

Authors:

Gao, D and Liu, N and Li, Y and Zhang, Y and Liu, G and others

Journal:

Metabolomics (Los Angel) (2017): 2153--0769

Suramin inhibits cullin-RING E3 ubiquitin ligases

Authors:

Wu, Kenneth and Chong, Robert A and Yu, Qing and Bai, Jin and Spratt, Donald E and Ching, Kevin and Lee, Chan and Miao, Haibin and Tappin, Inger and Hurwitz, Jerard and others

Journal:

Proceedings of the National Academy of Sciences (2016): E2011--E2018

Glycosaminoglycan mimicry by COAM reduces melanoma growth through chemokine induction and function

Authors:

Piccard, Helene and Berghmans, Nele and Korpos, Eva and Dillen, Chris and Aelst, Ilse Van and Li, S and ra and Martens, Erik and Liekens, S and ra and Noppen, Sam and Damme, Jo Van and others

Journal:

International Journal of Cancer (2012): E425--E436

References

View all 49 references: Citation Explorer

Sequential ordering among multicolor fluorophores for protein labeling facility via aggregation-elimination based beta-lactam probes

Authors:

Sadhu KK, Mizukami S, Watanabe S, Kikuchi K.

Journal:

Mol Biosyst (2011): 1766

Visualizing dengue virus through Alexa Fluor labeling

Authors:

Zhang S, Tan HC, Ooi EE.

Journal:

J Vis Exp. (2011)

Fluorescent "Turn-on" system utilizing a quencher-conjugated peptide for specific protein labeling of living cells

Authors:

Arai S, Yoon SI, Murata A, Takabayashi M, Wu X, Lu Y, Takeoka S, Ozaki M.

Journal:

Biochem Biophys Res Commun (2011): 211

Neuroanatomical basis of clinical joint application of "Jinggu" (BL 64, a source-acupoint) and "Dazhong" (KI 4, a Luo-acupoint) in the rat: a double-labeling study of cholera toxin subunit B conjugated with Alexa Fluor 488 and 594

Authors:

Cui JJ, Zhu XL, Ji CF, Jing XH, Bai WZ.

Journal:

Zhen Ci Yan Jiu (2011): 262

Simultaneous detection of virulence factors from a colony in diarrheagenic Escherichia coli by a multiplex PCR assay with Alexa Fluor-labeled primers

Authors:

Kuwayama M, Shigemoto N, Oohara S, Tanizawa Y, Yamada H, Takeda Y, Matsuo T, Fukuda S.

Journal:

J Microbiol Methods (2011): 119

Physical properties

Molecular weight	355.34
Solvent	DMSO

Spectral properties

Correction factor (260 nm)	0.83
Correction factor (280 nm)	0.23
Extinction coefficient (cm ^-1 M ^-1)	20000 ¹
Excitation (nm)	345
Emission (nm)	450
Quantum yield	0.95 ¹

Usage and storage

Intended use	Research Use Only (RUO)
Storage	Freeze (< -15 °C); Minimize light exposure

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Page updated on November 6, 2026