{"product_id":"ivd-ready-gold-nanoparticles-for-biosensing-size-optimization-kit","title":"\"IVD‑READY\" Gold Nanoparticles Size Optimization Kit for Biosensing","description":"\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003eOptimize your in-vitro diagnostic assay with one kit containing four carefully selected sizes of monodisperse spherical gold nanoparticles. The \"IVD‑READY\" Size Optimization Kit enables rapid comparison of nanoparticle diameter in lateral-flow assays, colorimetric biosensors, immunoassays, and other diagnostic formats.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003eTesting several sizes under identical assay conditions helps identify the nanoparticle that provides the best balance of visual signal, sensitivity, conjugate stability, membrane flow, and assay specificity.\u003c\/p\u003e\n\u003ch2 class=\"font-semibold leading-tight text-pretty mb-2 mt-4 [.has-inline-images_\u0026amp;]:clear-end text-lg first:mt-0 md:text-lg [hr+\u0026amp;]:mt-4\" id=\"kit-contents\"\u003e\u003cstrong\u003eKit contents\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:align-top\"\u003eFour selected sizes of \"IVD‑READY\" spherical gold nanoparticles: \n\u003cp class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:pb-2\"\u003e\u003cstrong\u003e20, 40, 80 and 100nm,\u003c\/strong\u003e with narrow size distribution\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoV (coefficient of variation): \u003c\/strong\u003e≤ 5%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePolydispersity index: \u003c\/strong\u003ePdI ≤ 0.1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:align-top\"\u003eEqual quantity of each nanoparticle size\u003c\/li\u003e\n\u003cli class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:align-top\"\u003eChoice of citrate-coated or PEG‑5000‑carboxylate-coated formulation\u003c\/li\u003e\n\u003cli class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:align-top\"\u003eSupplied as aqueous colloidal dispersions\u003c\/li\u003e\n\u003cli class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:align-top\"\u003eCertificate of Analysis provided for each size\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"font-semibold leading-tight text-pretty mb-2 mt-4 [.has-inline-images_\u0026amp;]:clear-end text-lg first:mt-0 md:text-lg [hr+\u0026amp;]:mt-4\" id=\"why-optimize-nanoparticle-size\"\u003e\u003cstrong\u003eWhy optimize nanoparticle size?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003eGold nanoparticle size can significantly affect the performance of an IVD assay. Smaller particles offer a higher surface-area-to-volume ratio and may be advantageous where reduced steric hindrance, efficient reagent interaction, or rapid flow is important. Larger particles generally provide stronger visible color and light scattering, which can improve visual readout, but may require careful optimization of conjugation conditions and membrane performance.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003eThe four sizes included in this kit allow developers to compare these size-dependent effects directly and select the most appropriate gold nanoparticle format for their specific assay design.\u003c\/p\u003e\n\u003ch2 class=\"font-semibold leading-tight text-pretty mb-2 mt-4 [.has-inline-images_\u0026amp;]:clear-end text-lg first:mt-0 md:text-lg [hr+\u0026amp;]:mt-4\" id=\"surface-coating-options\"\u003e\u003cstrong\u003eSurface-coating options\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003e\u003cb\u003eCitrate-coated \u003c\/b\u003egold nanoparticles are suitable for workflows based on passive adsorption of antibodies, proteins, or other biomolecules onto the gold surface. They are a flexible choice for conventional lateral-flow conjugate development and screening.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003e\u003cb\u003ePEG‑5000‑carboxylate-coated \u003c\/b\u003egold nanoparticles provide carboxyl functional groups for controlled covalent attachment of antibodies or other amine-containing biomolecules using standard coupling chemistries. The PEG spacer can help improve colloidal stability and provide a more controlled surface for conjugation.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003eThis flexibility lets align your conjugation strategy with assay format, stability requirements, and IVD regulatory needs. Find out \u003cspan style=\"color: rgb(30, 18, 155);\"\u003e\u003ca rel=\"noopener\" style=\"color: rgb(30, 18, 155);\" title=\"The role of Gold Nanoparticles surface chemistry for various applications\" href=\"https:\/\/www.nanobrand.com\/blogs\/infos\/surface-chemistry-as-the-real-product-when-you-buy-gold-nanoparticles\" target=\"_blank\"\u003e\u003cem\u003eWhy is Surface Chemistry a \"real product\" for Gold Nanoparticles.\u003c\/em\u003e\u003c\/a\u003e\u003c\/span\u003e\u003cspan style=\"color: rgb(30, 18, 155);\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 class=\"font-semibold leading-tight text-pretty mb-2 mt-4 [.has-inline-images_\u0026amp;]:clear-end text-lg first:mt-0 md:text-lg [hr+\u0026amp;]:mt-4\" id=\"applications\"\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul style=\"margin-top: 0cm;\" type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003eLateral-flow assay development and optimization\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003eAntibody–gold nanoparticle conjugate screening\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003eRapid antigen and antibody tests\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003eColorimetric immunoassays\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003eBiosensor and point-of-care diagnostic development\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003eComparative evaluation of signal intensity, flow behavior, sensitivity, and background\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: justify;\"\u003eLearn more about \u003cspan style=\"color: rgb(17, 24, 151);\"\u003e\u003ca rel=\"noopener\" style=\"color: rgb(17, 24, 151);\" title=\"Gold Nanoparticles in Biosensing and Personalized Medicine\" href=\"https:\/\/www.nanobrand.com\/pages\/gold-nanoparticles-smart-drug-delivery-for-modern-medicine\" target=\"_blank\"\u003e\u003cem\u003eGold Nanoparticles in Biosensing and Personalized Medicine\u003c\/em\u003e\u003c\/a\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\" style=\"text-align: justify;\"\u003e\u003cstrong\u003eIVD size-selection guidance\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul style=\"margin-top: 0cm;\" type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003e\n\u003cb\u003eSmaller diameters:\u003c\/b\u003e Useful for assessing rapid membrane migration, high relative surface area, and reduced steric effects during biorecognition.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003e\n\u003cb\u003eIntermediate diameters:\u003c\/b\u003e Often provide a practical balance between optical visibility, conjugate performance, and flow in lateral-flow formats.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: justify; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;\"\u003e\n\u003cb\u003eLarger diameters:\u003c\/b\u003e Useful when stronger visible color, enhanced scattering, or higher visual contrast is desired; assay conditions should be optimized to maintain efficient flow and low background.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"high-monodispersity-for-reliable-diagnostics\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_\u0026amp;]:clear-end text-base first:mt-0\"\u003e\n\u003cstrong\u003eHigh monodispersity for reliable diagnostics\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003e\u003cstrong\u003eTightly controlled monodispersity\u003c\/strong\u003e ensures uniform localized surface plasmon resonance, generating a strong, consistent red signal and predictable optical response in IVD biosensing assays. The narrow size distribution and clean, reactant‑free surface chemistry support \u003cstrong\u003erobust antibody and biomolecule conjugation\u003c\/strong\u003e, enabling sensitive, reproducible detection of proteins, antibodies, and nucleic acids in clinical diagnostics and research applications. \u003cspan\u003eExplore more about the \u003cspan style=\"color: rgb(17, 25, 182);\"\u003e\u003cem\u003e\u003ca href=\"https:\/\/www.nanobrand.com\/blogs\/infos\/monodispersity-and-purity-advantages-for-biosensing\" title=\"Benefits of monodisperse gold nanoparticles for LFAs.\" style=\"color: rgb(17, 25, 182);\" rel=\"noopener\" target=\"_blank\"\u003eBenefits of monodisperse Gold Nanoparticles for LFAs\u003c\/a\u003e\u003c\/em\u003e\u003c\/span\u003e.\u003c\/span\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: justify;\" class=\"MsoNormal\"\u003e\u003cstrong\u003eCustomization and OEM Options\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: justify;\" class=\"MsoNormal\"\u003e\u003cstrong\u003eCustom size combinations, concentrations, volumes  and PEG spacer lengths may be available on request.\u003c\/strong\u003e \u003cspan style=\"color: rgb(15, 21, 149);\"\u003e\u003ca style=\"color: rgb(15, 21, 149);\" href=\"https:\/\/www.nanobrand.com\/pages\/contact\" title=\"NanoBrand contact for customization of Gold Nanoparticles\" rel=\"noopener\" target=\"_blank\"\u003e\u003cem\u003eContact us\u003c\/em\u003e\u003c\/a\u003e\u003c\/span\u003e to assemble a kit tailored to your diagnostic-development workflow.\u003c\/p\u003e\n\u003ch2 style=\"text-align: justify;\" class=\"MsoNormal\"\u003e\u003cstrong\u003eStorage and Stability\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-bottom: 0cm; text-align: justify;\"\u003e\u003cb\u003e- Citrate‑coated: \u003c\/b\u003estore at 4–25 °C, do not freeze. Gently shake before use.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003e\u003cb\u003e- PEG‑COOH: \u003c\/b\u003estore at 2–8 °C, do not freeze. Gently shake before use.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"text-align: justify;\"\u003eUnder these conditions, products are typically stable for at least 12 months. For long‑term storage, check UV‑Vis spectra periodically to confirm colloidal and optical stability.\u003c\/p\u003e\n\u003ch2 style=\"text-align: justify;\" class=\"MsoNormal\"\u003e\u003cb\u003eSafety and Handling\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: justify;\" class=\"MsoNormal\"\u003eNanoBrand does not guarantee the suitability of its products for any particular application. It is the customer’s responsibility to ensure that the product is appropriate and permitted for the intended use, in accordance with applicable regulations and internal quality systems. Please consult our\u003ci\u003e \u003cspan style=\"color: rgb(21, 28, 162);\"\u003e\u003ca style=\"color: rgb(21, 28, 162);\" title=\"NanoBrand Terms of Service\" href=\"https:\/\/www.nanobrand.com\/policies\/terms-of-service\" target=\"_blank\"\u003eTerms of Service\u003c\/a\u003e\u003c\/span\u003e\u003c\/i\u003e and follow institutional guidelines for the safe handling and disposal of nanomaterials.\u003c\/p\u003e\n\u003cp class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:pb-2\"\u003eDiscover\u003cem\u003e \u003cspan style=\"color: rgb(45, 22, 146);\"\u003e\u003ca title=\"Gold Nanoparticles - Spherical, Citrate Surface\" href=\"https:\/\/www.nanobrand.com\/collections\/gold-nanoparticles-citrate-surface\" rel=\"noopener\" style=\"color: rgb(45, 22, 146);\" target=\"_blank\"\u003eGold Nanoparticles - Spherical, Citrate Surface\u003c\/a\u003e\u003c\/span\u003e\u003c\/em\u003e\u003cspan style=\"color: rgb(33, 15, 149);\"\u003e\u003cem\u003e \u003c\/em\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eand\u003c\/span\u003e\u003cem\u003e \u003cspan style=\"color: rgb(34, 15, 153);\"\u003e\u003ca title=\"Gold Nanostars\" rel=\"noopener\" href=\"https:\/\/www.nanobrand.com\/collections\/gold-nanostars\" style=\"color: rgb(34, 15, 153);\" target=\"_blank\"\u003eGold Nanostars.\u003c\/a\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"my-2 [\u0026amp;+p]:mt-4 [\u0026amp;_strong:has(+br)]:inline-block [\u0026amp;_strong:has(+br)]:pb-2\"\u003e\u003cspan style=\"mso-ansi-language: EN-CA;\" lang=\"EN-CA\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0895\/2977\/8457\/files\/all_particles_free_of_final.png?v=1753887881\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"NanoBrand","offers":[{"title":"PEG5000-COOH \/ 20 \/ 4ml (1ml of each size)","offer_id":52967417348377,"sku":"NB-GSP-IVD-ALL-5CARB-20-1","price":932.0,"currency_code":"USD","in_stock":true},{"title":"PEG5000-COOH \/ 20 \/ 8ml (2ml of each size)","offer_id":52967419773209,"sku":"NB-GSP-IVD-ALL-5CARB-20-2","price":1482.0,"currency_code":"USD","in_stock":true},{"title":"PEG5000-COOH \/ 50 \/ 4ml (1ml of each size)","offer_id":52967417512217,"sku":"NB-GSP-IVD-ALL-5CARB-50-1","price":2332.0,"currency_code":"USD","in_stock":true},{"title":"PEG5000-COOH \/ 50 \/ 8ml (2ml of each size)","offer_id":52967419838745,"sku":"NB-GSP-IVD-ALL-5CARB-50-2","price":3698.0,"currency_code":"USD","in_stock":true},{"title":"PEG5000-COOH \/ 50 \/ 2ml (0.5ml of each size)","offer_id":52967419871513,"sku":"NB-GSP-IVD-ALL-5CARB-50-0.5","price":1235.0,"currency_code":"USD","in_stock":true},{"title":"Citrate \/ 20 \/ 4ml (1ml of each size)","offer_id":52517929124121,"sku":"NB-GSP-IVD-ALL-CIT-20-1","price":889.0,"currency_code":"USD","in_stock":true},{"title":"Citrate \/ 20 \/ 8ml (2ml of each size)","offer_id":52967419642137,"sku":"NB-GSP-IVD-ALL-CIT-20-2","price":1419.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/2977\/8457\/files\/20nm-40nm-80nm-100nm-PEG-gold-nanoparticles-unlabeled-bottles.jpg?v=1777479998","url":"https:\/\/www.nanobrand.com\/products\/ivd-ready-gold-nanoparticles-for-biosensing-size-optimization-kit","provider":"NanoBrand ","version":"1.0","type":"link"}