Product summary links on this page:

Assay development

Custom conjugation

Dressed Gold ®

Naked Gold ®

Iso-Gold Kit™

Gold-in-a-Box™

Tell-Tale Gold ®

C-FLAT® lateral-flow platform

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BioAssay Works Homepage

Product summary links on this page:

Assay development

Custom conjugation

Dressed Gold ®

Naked Gold ®

Iso-Gold Kit™

Gold-in-a-Box™

Tell-Tale Gold ®

C-FLAT® lateral-flow platform

Features & Benefits

Products & Services, overview

Gold nanoparticles so small they appear intensely red and remain suspended in water serve as the core component that enables rapid assays (point-of-care, POC, assays) to detect minute traces of important substances.

To accomplish this feat, nano-gold particles (gold sol) must be coated with appropriate receptors that react specifically with the molecules to be detected.

BioAssay Works was organized for the purpose of creating the gold sols used in ultra-sensitive rapid diagnostic tests.

product photo

Assay development - BioAssay Works offers extensive experience in the development of rapid, point-of-care, lateral-flow-format diagnostic assays. The combination of our proprietary concentrated gold sols and our patented C-FLAT® (Counter Flow Amplified Test) assay plaform contributes to significant savings in development time and money, and speeds time-to-market. Key services include contract assay development, contract manufacturing, antibody development, lateral-flow component optimization, and reagent supply. Read more...


Custom conjugation services, hybridoma development and antibody engineering - BioAssay Works personnel have extensive experience in conjugating soluble proteins, haptens, hydrophobic proteins, and viral and bacterial proteins to our concentrated gold sol to speed your assay research. Our unique concentrated gold sol, capability in assay optimization, and our patented C-FLAT® assay platform produce numerous untra-sensitive assays for our clients. Read more...


Dressed Gold® - labeled colloidal gold sol, nanoparticles. BioAssay Works' Dressed Gold is produced from our proprietary Naked Gold sol and has not been boiled, or centrifuged. The highly active gold particles contribute to increased sensitivity in lateral-flow assays. Inquire regarding custom conjugation of gold particles to clients' ligands. Read more...


Naked Gold® - unlabeled gold sol, 15 OD (Optical Density). Note that 50 OD is available as a custom conjugate. Inquire for more information on 50 OD gold sols, and see "Dressed Gold" below. Naked Gold sols for ligand conjugation are optimized for rapid assay development and POC rapid diagnostic products. Naked Gold is produced by a proprietary process that does not involve the traditional boiling and centrifugation methods. This unique process allows the end-user to directly coat antibody or soluble proteins onto gold without the need to concentrate the gold via centrifugation. By eliminating the gold concentration centrifugation step, the potential for aggregates is greatly minimized. Our high quality gold sol is consistently reproducible. Read more...


Iso-Gold™ rapid mouse-monoclonal isotyping kit - The Iso-Gold kit is a rapid-format isotyping kit that reduces the labor of the traditional ELISA kit from a day-and-a-half procedure to a five-minute assay. The Iso-Gold kit also determines monoclonal antibody purity and identifies sub-class contamination; multiple lines indicate sub-class contamination. Read more...


Gold-in-a-Box™- an easy-to-use kit for preparing highly reactive gold conjugates. The Gold-in-a-Box kit enables users to quickly determine (in less than one hour) the optimal colloidal gold binding conditions for attaching soluble proteins, and the Fc portion of purified monoclonal and polyclonal antibodies. The resulting gold particles are highly active and greatly increase the sensitivity of lateral-flow tests. Also, available separately, is a treated ribbon to produce an optimized gold conjugate pad. Customized components are available upon request. Read more...


Tell-Tale Gold® - gold sol impregnated ribbon. BioAssay Works' Tell-Tale Gold polyester ribbon impregnated with our conjugated Protein A and Protein G concentrated gold particles is dried in a proprietary process that ensures rapid release. We also offer gold ribbon for any monoclonal polyclonal antibody or soluble protein on a custom basis. Read more...


C-FLAT® lateral-flow platform - BioAssay Works' novel, patented lateral-flow immunodiagnostic device that incorporates unique gold sol production, conjugation expertise, and impregnated ribbon technology into the counter-flow lateral platform. Read more...


BioAssay Works creates gold sols and gold-sol-based assays with superior performance and reliability, in combination with reduced manufacturing costs.

Features and Advantages of BioAssay Works Products:

  • A 10- to 15-fold increase in gold nanoparticle concentration over existing technology. 15 to 50 OD (Optical Density) gold nanoparticle sols, versus 1 OD produced by the current technology protocols.
  • Ready-to-use gold particle sols (no concentration required)
  • Laboratory time and labor saved: Unlike current technology, no centrifuging is required
  • Increased consistency in product quality: Reproducibility of conjugation is improved with BioAssay Works' new technology
  • Reduced manufacturing waste by 10% to 20%, and increased manufacturing efficiency
  • Uniform monomer particles: No aggregates, and dramatic reduction of particle waste

BioAssay Works gold sol products solve a problem of gold particle concentration that exists with current technology and all competitive products.

Benefits to the customer include:

  • Customers who manufacture their own diagnostic products will find that the 15 to 50 OD formulations significantly improve their process and reproducibility, while reducing costs.
  • Improved reproducibility of all rapid diagnostic products
  • Reduced waste of gold particles and precious antibodies and antigens
  • Reduced laboratory and production costs, leading to increased profits

Trial demonstrations may be arranged. Contact BioAssay Works via email at sales@bioassayworks.com or by phone at 301.874.8888 to inquire. Please try our main office phone first (301.874.8888), but if you have sales or product questions that demand an immediate answer and you are unable to reach us during office hours, our secondary voice phone number is 571.277.0626.


If you need a rapid, POC assay to a particular goal, or are experiencing challenges with the sensitivity of a current assay, please give us a call at 301.874.8888. BioAssay Works has great solutions to offer.


BioAssay Works is a registered trademark of BioAssay Works, L.L.C. The BioAssay Works logo is also a registered trademark. All text, graphics, product names, and interactive media on this website are protected by copyright and may not be copied in any media without the express permission of the founders of BioAssay Works, L.L.C.

BioAssay Works ®, L.L.C. | 10075, #18, Tyler Place, Ijamsville, MD, 21754 | sales@bioassayworks.com
voice phone 301.874.8888 | fax 301.874.8889