{"product_id":"cortisol-eia-kit-bht11900002","title":"Cortisol EIA Kit","description":"\u003cdiv class=\"bhp-desc\"\u003e\n\u003cstyle\u003e\n.bhp-desc{font-size:16px;color:#1a1a1a;line-height:1.7}\n.bhp-desc h2{font-size:18px;font-weight:700;color:#003366;margin:24px 0 10px;padding-bottom:6px;border-bottom:2px solid #003366}\n.bhp-desc p{margin:0 0 12px}\n.bhp-desc .bhp-spec-table{width:100%;border-collapse:collapse;margin:12px 0 18px}\n.bhp-desc .bhp-spec-table th{width:36%;text-align:left;padding:8px 12px;background:#e8f0fb;color:#003366;font-weight:600;vertical-align:top;border:1px solid #ccd9f0}\n.bhp-desc .bhp-spec-table td{padding:8px 12px;vertical-align:top;border:1px solid #ccd9f0}\n.bhp-desc .bhp-qc-badge{display:inline-block;background:#e6f4ea;color:#1a7a3c;border:1px solid #a8d5b5;border-radius:4px;padding:6px 14px;font-size:14px;font-weight:600}\n.bhp-desc .bhp-warning-box{background:#fff8e6;border-left:4px solid #e6a817;padding:10px 14px;margin:10px 0 14px;border-radius:0 4px 4px 0}\n.bhp-desc .bhp-cat-pill{display:inline-block;background:#003366;color:#fff;border-radius:20px;padding:3px 12px;font-size:13px;margin-bottom:10px}\n.bhp-desc .kit-comp-table{width:100%;border-collapse:collapse;margin:12px 0 18px;font-size:14px}\n.bhp-desc .kit-comp-table th{background:#003366;color:#fff;padding:7px 10px;text-align:left;border:1px solid #ccd9f0}\n.bhp-desc .kit-comp-table td{padding:7px 10px;border:1px solid #ccd9f0;vertical-align:top}\n.bhp-desc .kit-comp-table tr:nth-child(even) td{background:#f4f7fc}\n\u003c\/style\u003e\n\n\u003ch2\u003eScientific Background\u003c\/h2\u003e\n\u003cp\u003eCortisol (C₂₁H₃₀O₅), the primary glucocorticoid hormone produced by the zona fasciculata of the adrenal cortex, is synthesized in an ACTH-dependent manner following activation of the hypothalamic–pituitary–adrenal (HPA) axis. Its secretion follows a robust diurnal rhythm, peaking in the early morning (06:00–08:00) and declining to nadir in late evening—a pattern disrupted in depression, Cushing's syndrome, and post-traumatic stress disorder.\u003c\/p\u003e\n\u003cp\u003eOnly free cortisol (~4% of total circulating cortisol) is biologically active and able to traverse the blood–brain barrier to bind glucocorticoid receptors (GR) widely expressed in the hippocampus, prefrontal cortex, and amygdala. Chronic HPA axis dysregulation suppresses hippocampal neurogenesis, reduces BDNF expression, and promotes dendritic atrophy in pyramidal neurons—mechanisms implicated in stress-induced depression, MCI, and accelerated neurodegeneration in Alzheimer's disease.\u003c\/p\u003e\n\u003cp\u003eCortisol measurement in multiple biological matrices (serum, saliva, urine, fecal extracts) allows non-invasive longitudinal profiling of HPA axis reactivity, making it an indispensable biomarker in stress biology, psychoneuroimmunology, and clinical neuroscience research.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"bhp-cat-pill\"\u003eStressXpress®\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eCortisol EIA Kit\u003c\/strong\u003e (Cat. # SKT-201) from StressMarq Biosciences is a research-grade kit for quantitative Cortisol measurement in Dried Fecal Samples, Saliva, Urine, Serum, EDTA Plasma, Heparin Plasma, Tissue Culture Media. This kit employs a competitive immunoassay principle with colorimetric TMB\/spectrophotometric readout on a standard 96-well microplate reader.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable class=\"bhp-spec-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eAnalyte \/ Target\u003c\/th\u003e\n\u003ctd\u003eCortisol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAssay Type\u003c\/th\u003e\n\u003ctd\u003eCompetitive EIA (Enzyme Immunoassay)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDetection Method\u003c\/th\u003e\n\u003ctd\u003eColorimetric (microplate spectrophotometry)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSensitivity\u003c\/th\u003e\n\u003ctd\u003e17.3 pg\/ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDetection Range\u003c\/th\u003e\n\u003ctd\u003e100–3,200 pg\/ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Matrices\u003c\/th\u003e\n\u003ctd\u003eDried Fecal Samples, Saliva, Urine, Serum, EDTA Plasma, Heparin Plasma, Tissue Culture Media\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecies Reactivity\u003c\/th\u003e\n\u003ctd\u003eSpecies Independent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThroughput\u003c\/th\u003e\n\u003ctd\u003e40 samples in duplicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncubation Time\u003c\/th\u003e\n\u003ctd\u003e90 Minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003ctd\u003eMicroplate (96-well)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCatalog Number\u003c\/th\u003e\n\u003ctd\u003eSKT-201\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003e4ºC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTrademark\u003c\/th\u003e\n\u003ctd\u003eStressXpress®\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eAssay Principle\u003c\/h2\u003e\n\u003cp\u003eThis kit uses a competitive or sandwich enzyme immunoassay (EIA) format—a microplate-based immunoassay technique functionally equivalent to ELISA. Cortisol in the sample competes with enzyme-labeled conjugate for a limited number of antibody binding sites. Bound conjugate is detected colorimetrically via TMB substrate; absorbance is inversely proportional to the Cortisol concentration, interpolated from a calibration curve (range: 100–3,200 pg\/ml).\u003c\/p\u003e\n\u003cp\u003eThe kit measures total Cortisol and is fully validated for use in \u003cstrong\u003eDried Fecal Samples, Saliva, Urine, Serum, EDTA Plasma, Heparin Plasma, Tissue Culture Media\u003c\/strong\u003e. The Steroid Solid Extraction Protocol (where provided) enables reliable extraction from complex matrices such as dried fecal samples.\u003c\/p\u003e\n\n\u003ch2\u003eKit Components\u003c\/h2\u003e\n\u003ctable class=\"kit-comp-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent #\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003cth\u003eQuantity \/ Volume\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201A\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClear Microtitre 96-well Plate\u003c\/td\u003e\n\u003ctd\u003e1 Plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCortisol Standard\u003c\/td\u003e\n\u003ctd\u003e125 µl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStressXpress® Cortisol Antibody\u003c\/td\u003e\n\u003ctd\u003e3 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201D\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStressXpress® Cortisol Conjugate\u003c\/td\u003e\n\u003ctd\u003e3 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201E\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAssay Buffer\u003c\/td\u003e\n\u003ctd\u003e28 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201F\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDissociation Reagent\u003c\/td\u003e\n\u003ctd\u003e1 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201G\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWash Buffer Concentrate\u003c\/td\u003e\n\u003ctd\u003e30 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201H\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTMB Substrate\u003c\/td\u003e\n\u003ctd\u003e11 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201I\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStop Solution\u003c\/td\u003e\n\u003ctd\u003e5 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKC-201J\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlate Sealer\u003c\/td\u003e\n\u003ctd\u003e1 each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eQuality Control \u0026amp; Validation\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"bhp-qc-badge\"\u003e✓ Peer-Reviewed \u0026amp; Research Validated\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eEach lot is validated for sensitivity, intra-assay precision (CV \u0026lt;10%), and linearity of recovery. Products from the StressXpress® range cite published peer-reviewed literature for independent validation.\u003c\/p\u003e\n\n\u003ch2\u003eSafety \u0026amp; Regulatory\u003c\/h2\u003e\n\u003cdiv class=\"bhp-warning-box\"\u003e\n\u003cstrong\u003eResearch Use Only (RUO).\u003c\/strong\u003e Not for use in humans. Not for use in diagnostics or therapeutics. For in vitro research use only.\u003c\/div\u003e\n\u003cp\u003eADR Classification: Non-hazardous. Shipping: cold-chain (blue ice). Harmonized Tariff Code: 3822.19.0030 (UNSPSC: 12352203). Country of Origin: Canada.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"StressMarq Biosciences Inc.","offers":[{"title":"96 well","offer_id":53340031877485,"sku":"SKT-201-96","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/SKT-201_Cortisol_EIA_Kit_Standard_Curve_Fig1.png?v=1779020319","url":"https:\/\/www.ebiohippo.com\/products\/cortisol-eia-kit-bht11900002","provider":"BioHippo","version":"1.0","type":"link"}