{"product_id":"grove-gold-l-cysteine-fluorescent-red","title":"Grove Gold-L-Cysteine Fluorescent Red ~4 nm","description":"\u003cp\u003eGold nanoparticles (~4 nm) capped with L-cysteine, dispersed in water. The absorption peak is in the near ultraviolet at ~370 nm and the red emission peak is at ~645 nm, ~275 nm apart, so a long-pass filter that rejects your UV excitation and transmits the emission band separates the emission cleanly. The colloid looks milky white in ordinary light and glows red under a UV lamp.\u003c\/p\u003e\n\u003cp\u003eL-cysteine binds to gold through sulfur, leaving carboxyl and amine groups available; EDC\/NHS activates the carboxyl groups for coupling to primary amines. Because the surface also carries amines, activated particles can link to each other, so work at a low particle concentration and remove excess EDC before adding your protein. Grove lists fluorescent sensing, optical assays and biointerfaces as research uses.\u003c\/p\u003e","brand":"Grove Nanomaterials","offers":[{"title":"10 mL at OD 1","offer_id":55481946440022,"sku":"GROVE-LCYS-RED-10ML-OD1","price":199.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1066\/2802\/2614\/files\/grove-l-cysteine-ambient-uv-v3.png?v=1790634803","url":"https:\/\/marixiascientific.com\/products\/grove-gold-l-cysteine-fluorescent-red","provider":"Marixia Scientific","version":"1.0","type":"link"}