GET A QUOTE

Free Cortisol Saliva ELISA Kit

INTENDED USE

Free cortisol saliva ELISA kit is an accurate in vitro quantitative method for detecting free cortisol in any species using saliva samples. This assay has a minimum sensitivity detection limit of 24.0 pg/ml.

BACKGROUND

Cortisol that can also be called compound F hydrocortisone is produced in the adrenal cortex within the zona fasciculate or the zona reticularis. Majority of it is found to bound either to cortisol-binding globulins (CBG)(around 90%) or albumin (approx. 7%), whilst only a small fraction between 1-3% is found either as unconjugated or free cortisol. This is the biologically active form of cortisol and it is released in salvia and is then excreted through the kidneys as a relatively small portion among many of the metabolites of cortisol. The amount of free cortisol that is present in blood is responsible for regulating its secretion in the adrenal cortex via a negative feedback mechanism through corticotropin releasing hormone (CRH) within the hypothalamic region and through the ACTH within the pituitary gland. The following salivary cortisol ELISA kit has be designed so that it can be used for a wide range of diagnostic applications, it is specifically intended for saliva samples and is suitable for any species.

In humans generally the level of cortisol is found to physiologically fluctuate throughout the day, where the highest concentration are found in the morning and the lowest at midnight. This different levels of fluctuations are accurately reflected in saliva where the highest peak is observed within the first 90 minutes after waking up. Due to the fact that collecting saliva samples is relatively easy and is non-invasive, without putting the patient under any unnecessary stress due to any repeated venipunctures. This salivary assay offers an excellent alternative to LC-MS/MS method, it is simple to perform and provides accurate results that are comparable. The determination of salivary cortisol is highly recommended in patients with abnormal levels of CBG (such as people with hypothyroidism, pregnant women, marked adipositas and nephrotic syndrome).

FREE CORTISOL SALIVA ELISA KIT CONTENT

All reagents supplied need to be stored at 2 °C – 8 °C, unopened reagents will retain reactivity until expiration date. Do not use reagents beyond this date.

  • Microtiterwells (96 Wells): Coated with polyclonal rabbit anti-cortisol antibody.
  • Calibrator 0.
  • Calibrators 1-5: Concentrations 0.1, 0.4, 1.7, 7.0, 30 ng/ml, made up from human cortisol.
  • Control 1 (Low) And Control 2 (High).
  • Enzyme Conjugate: Consisting of cortisol conjugated to horseradish peroxidase (HRP).
  • TMB Substrate Solution.
  • Stop Solution
  • Wash Solution (10x Concentrated).

SENSITIVITY

The minimum sensitivity detection limit of free cortisol using current salivary cortisol ELISA kit was approximately 24.0 pg/ml. The dynamic range for this assay is 0.1 – 30.0 ng/ml.

ASSAY CHARACTERISTICS

– Free Salivary Cortisol (Free Cortisol Saliva): ELISA
– Analytical Sensitivity: 0.019 ng/ml
– Specificity (Cross Reactivity): Prednisolone (100%), 11-Deoxycortisol (50%), Corticosterone (6.2%), 11-Deoxycorticosterone (2.6%), 17-Hydroxyprogesterone (1.3%), Prednisone (0.9%), Cortisone (0.8%), Testosterone, Dexamethasone, Estriol, Estrone, Progesterone, Danazole, Pregnenolone, Estradiol, Androstenedione (< 0.1%).
– Assay Dynamic Range: 0.1 – 30 ng/ml.
– Intra-Assay Variation: 4.1 – 7.1%
– Inter-Assay Variation: 4.2 – 9.1%
– Recovery: 92 – 126%
– Linearity: 99 – 120%

REFERENCES

  1. Measurement of salivary cortisol in 2012 – laboratory techniques and clinical indications. Clin Endocrinol (Oxf). (2012) 77 (5): 645-51. Review. Inder W.J., et al.
  2. Saliva cortisol–a new approach in noise research to study stress effects. Int J Hyg Environ Health. (2005) 208 (3): 227-30. Review. Bigert C., et al.
  3. Salivary cortisol for assessment of hypothalamic-pituitary-adrenal axis function. Neuroimmunomodulation. (2009) 16 (5): 284-9. Review. Törnhage C.J.
  4. Salivary cortisol in psychobiological research: an overview. Neuropsychobiology. (1989) 22 (3): 150-69. Review. Kirschbaum C. and Hellhammer D.H.

ADDITIONAL INFORMATION

  • Full Name: Free Cortisol Saliva ELISA Kit
  • Reactivity: Any Species
  • Sample Type: Saliva
  • Sensitivity: 24.0 pg/ml

OTHER RELATED ELISA KITS

TESTIMONIALS arrow icon

Your secretory IgA ELISA gave good results and I was also really impressed with how quickly we received it.

L. Johnston
PhD Student / University of Glasgow

It is refreshing to know that you have a technical team that is very knowledgeable. I have already recommended your company to other researchers in our department.

Dr. P. Anderson
Lecturer / University College London (UCL)

I am a first time user and found that your instruction manual was very easy to follow. The insulin ELISA assay performed well and I was happy with the results that were generated.

J. Thomas
Senior Technician / Addenbrooke’s Hospital

I carried out a pilot study comparing the performance of many ELISA assay's from different suppliers and found your kits to be one of the better performers. We observed good linearity and tight replicates.

Dr. C. Davies
Lead Scientists / AstraZeneca

You are my first point of contact when I am looking to purchase ELISA. You have such an easy and simple system, yet it is very effective.

A. Shaw
Purchasing / University of Oxford