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Amplite® Fluorimetric Protein Quantitation Kit *Orange Fluorescence*

BSA, chicken-egg ovalbumin, porcine thyroglobulin dose response was measured at Ex/Em 485/590 in a 96-well black plate with the Amplite® Fluoremetric Protein Quantitation Kit. As low as 0.1 ug/mL of BSA can be detected.
BSA, chicken-egg ovalbumin, porcine thyroglobulin dose response was measured at Ex/Em 485/590 in a 96-well black plate with the Amplite® Fluoremetric Protein Quantitation Kit. As low as 0.1 ug/mL of BSA can be detected.
BSA, chicken-egg ovalbumin, porcine thyroglobulin dose response was measured at Ex/Em 485/590 in a 96-well black plate with the Amplite® Fluoremetric Protein Quantitation Kit. As low as 0.1 ug/mL of BSA can be detected.
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Storage, safety and handling
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22


Protein quantification is an essential task in protein purification, electrophoresis, cell biology, molecular biology and other research applications. Biuret, Lowry, BCA and Bradford assays are routinely used for estimating protein concentration. However, these colorimetric assays are less sensitive, and require large sample volume to ensure accuracy. Our Amplite® Fluorimetric Protein Quantitation Kit is significantly more sensitive than existing colorimetric protein measurements, e.g., Bradford and Bicinchoninic acid (BCA) assays. Prolite™ Orange used in the kit is non-fluorescent in aqueous solution, but reacts rapidly with proteins and generates bright fluorescence. The Amplite® Fluorimetric Protein Quantitation Kit provides a simple method for quantifying protein concentration in solutions. As little as 0.1 µg/mL of BSA can be detected. The kit can be performed in a convenient 96-well or 384-well microtiter-plate format. It can be completed within 30 minutes with the fluorescence signal easily monitored. This kit has been used for (1) studying protein/protein interactions; (2) measuring column fractions after affinity chromatography; (3) estimating recovery of membrane proteins from cell extract; and (4) high-throughput screening of fusion proteins.


Fluorescence microplate reader

Excitation485 nm
Emission590 nm
Cutoff570 nm
Recommended plateSolid black


Example protocol


Protocol summary

  1. Prepare Prolite™ Orange working solution (50 µL)
  2. Add BSA standards and/or test samples (50 µL)
  3. Incubate at room temperature for 30 minutes
  4. Read fluorescence intensity at Ex/Em = 485/590 nm

Important notes
Thaw all the kit components at room temperature before starting the experiment.


Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles.

Protein Enhancer stock solution (500X):
Add 100 µL of Protein Enhancer Buffer (Component E) into the vial of Protein Enhancer (Component C). Note: 20 µL of Protein Enhancer stock solution (500X) is enough for make 10 mL working solution. Unused Protein Enhancer stock solution (500X) should be stored in single use aliquots at -20 oC.


BSA standard

For convenience, use the Serial Dilution Planner: https://www.aatbio.com/tools/serial-dilution/11105

Note: Standards and test samples should be prepared in Protein Enhancer working solution.


1. Protein Enhancer working solution:
Add 20 µL of Protein Enhancer stock solution (500X) into 10 mL of Assay Buffer (Component D) and mix them well.

2. Prolite™ Orange Working Solution:
Add 10 µL of Prolite™ Orange (Component A) into 5 mL of Assay Buffer (Component D) and mix them well. Note: 5 mL of Prolite™ Orange working solution is enough for 1 plate. Prepare enough Prolite™ Orange working solution fresh for each experiment.


Table 1. Layout of BSA standards and test samples in a solid black 96-well microplate. BS = BSA standard (BS1-BS7); BL = blank control; TS = test sample.


Table 2. Reagent composition for each well

BSA StandardBlank ControlTest Sample
Serial Dilutions: 50 µLProtein Enhancer working solution: 50 µL50 µL

Protein assay

  1. Add 50 µL of BSA standard, blank control, and test samples (See table 1 and 2) into a solid black 96-well plate. Note: For a 384-well plate, add 20 µL of samples.

  2. Add 50 µL/well of Prolite™ Orange working solution into BSA standard, blank control, and test samples to make the total assay volume of 100 µL/well. Note: For a 384-well plate, add 20 µL of Prolite™ Orange working solution into each well.

  3. Incubate the reaction for 10 to 30 minutes at 37 oC, protected from light.

  4. Monitor the the fluorescence increase with a fluorescence plate reader at Ex/Em = 485/590 nm.



View all 27 references: Citation Explorer
Use of anchor protein modules in fluorescence polarisation aptamer assay for ochratoxin A determination
Authors: Samokhvalov, A. V.; Safenkova, I. V.; Eremin, S. A.; Zherdev, A. V.; Dzantiev, B. B.
Journal: Anal Chim Acta (2017): 80-87
Quantification of Membrane Protein Self-Association with a High-Throughput Compatible Fluorescence Assay
Authors: Li, J.; Qiu, X. J.
Journal: Biochemistry (2017): 1951-1954
Dual Amplification Fluorescence Assay for Alpha Fetal Protein Utilizing Immunohybridization Chain Reaction and Metal-Enhanced Fluorescence of Carbon Nanodots
Authors: Xu, D. D.; Liu, C.; Li, C. Y.; Song, C. Y.; Kang, Y. F.; Qi, C. B.; Lin, Y.; Pang, D. W.; Tang, H. W.
Journal: ACS Appl Mater Interfaces (2017): 37606-37614
Tryptophan fluorescence quenching as a binding assay to monitor protein conformation changes in the membrane of intact mitochondria
Authors: Akbar, S. M.; Sreeramulu, K.; Sharma, H. C.
Journal: J Bioenerg Biomembr (2016): 241-7
Label-free fluorescence assay for protein kinase based on peptide biomineralized gold nanoclusters as signal sensing probe
Authors: Song, W.; Wang, Y.; Liang, R. P.; Zhang, L.; Qiu, J. D.
Journal: Biosens Bioelectron (2015): 234-40
Characterization of G protein-coupled receptors by a fluorescence-based calcium mobilization assay
Authors: Caers, J.; Peymen, K.; Suetens, N.; Temmerman, L.; Janssen, T.; Schoofs, L.; Beets, I.
Journal: J Vis Exp (2014): e51516
Budded baculoviruses as a tool for a homogeneous fluorescence anisotropy-based assay of ligand binding to G protein-coupled receptors: the case of melanocortin 4 receptors
Authors: Veiksina, S.; Kopanchuk, S.; Rinken, A.
Journal: Biochim Biophys Acta (2014): 372-81
Cleavage of pro-tumor necrosis factor alpha by ADAM metallopeptidase domain 17: a fluorescence-based protease assay cleaves its natural protein substrate
Authors: Zhang, C.; Zheng, L.; Nurnberg, J.; Vacari, B. M.; Zhou, J.; Wang, Y.
Journal: Anal Biochem (2014): 14-9
Development of a fluorescence intensity assay for the mitotic serine/threonine protein kinase Aurora-A
Authors: Slatter, A. F.; Campbell, S.; Angell, R. M.
Journal: J Biomol Screen (2013): 219-25
Direct comparison of the histidine-rich protein-2 enzyme-linked immunosorbent assay (HRP-2 ELISA) and malaria SYBR green I fluorescence (MSF) drug sensitivity tests in Plasmodium falciparum reference clones and fresh ex vivo field isolates from Cambodia
Authors: Chaorattanakawee, S.; Tyner, S. D.; Lon, C.; Yingyuen, K.; Ruttvisutinunt, W.; Sundrakes, S.; Sai-gnam, P.; Johnson, J. D.; Walsh, D. S.; Saunders, D. L.; Lanteri, C. A.
Journal: Malar J (2013): 239