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Collodial Gold Superior stability, sensitivity, precision and reproducibility of manufacture make gold suitable for use in membrance based rapid test. Leading manufacturers of rapid tests are turning increasingly to Colloidal Gold. Gold is essentially insert and forms almost perfect spherical particles when properly manufactured Proteins bind to the surfaces of these gold particles with enormous strength when correctly coupled, thus providing high degree of long term stability. Also, when accurately stabilised during manufacturing non specific interaction of gold conjugates can be reduced to zero. Span's Collodial Gold Span's highly controlled manufacturing process for preparation of Colloidal Gold ensures consistency of particle formation,resulting in homogenous solution. This uniform morphology of gold particles ensure formulation of cluster free collodial solution. Span's Collodial Gold gives very high strength of binding which is attributed to its uniform shape and size of the gold particles. Unlabelled Gold Gold solution with 1.0 O.D (Optical Density) for ligand conjugation, optimised for rapid assay development. • Uniform sized particles with CV < 8% • Narrow shape variation with roundness > 95% and odd shapes <5% • Dark Red colored solution • Highly stable with minimal clustering Labelled Gold Labeled / conjugated gold solution,supplied as stock gold solution with optical density as specified by customer. • Consistent morphology, ensures comprehensive and equal distribution of protein bound to particle surface • Binding capacity (Ug / OD of Colloidal Gold) 3.5 - 4 for particle size of 40 nm • Sensitivity optimised for conjugation parameters Custom Conjugation Service Colloidal Gold reagents are available in particle size of 20 nm - 40 nm. Conjugates are offered in concentration of 10 OD to 20 OD at 520 nm to 530 nm for standard formulation. Span's custom conjugation service develops excellent quality conjugates specific to customer requirement using reagents either provided by customer or sourced by Span Other bulk reagents supplies • Hepatitis B Surface Antigen • Hepatitis B surface Antigen derived from Human's plasma by physico - chemical methods and available as semi-pure and highly-pure grade,analysed by HPLC and SDS-PAGE methods. • Stained Salmonella cells. • Salmonella species inactivated and stained cells supplied in bulk,utilized for Widal Test • Anti-HIV serum raised in Goat. • Anti-HIV serum raised in Goat,immunized by highly immunogenic peptides with standardized protocol with good titer and performance. • Bulk Reagents for diagnosis of Syphilis • RPR,TRUST and synthetic VDRL antigen licensed from CDC,USA. |
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