THC Metabolite ELISA Kit

[Pages:19]THC Metabolite ELISA Kit

Item No. 701570



Customer Service 800.364.9897 Technical Support 888.526.5351

1180 E. Ellsworth Rd ? Ann Arbor, MI ? USA

TABLE OF CONTENTS

GENERAL INFORMATION

3 Materials Supplied 4 Safety Data 4 Precautions 4 If You Have Problems 5 Storage and Stability 5 Materials Needed but Not Supplied

INTRODUCTION

6 Background 7 About This Assay 8 Principle of Assay 10 Definition of Key Terms

PRE-ASSAY PREPARATION

12 Buffer Preparation 13 Testing for Interference 14 Sample Preparation 15 Sample Matrix Properties

ASSAY PROTOCOL

18 Preparation of Assay-Specific Reagents 20 Plate Set Up 22 Performing the Assay

ANALYSIS

24 Calculations 26 Performance Characteristics

RESOURCES

30 Assay Summary 31 Plate Template 32 Troubleshooting 33 References 34 Notes 35 Warranty and Limitation of Remedy

GENERAL INFORMATION Materials Supplied

Item Number

701571 701572 701573 400080 411007 400009/400008 400012 400089 400040 400042

Item

THC Metabolite Antibody THC Metabolite-AP Tracer THC Metabolite ELISA Standard Tris Buffer Concentrate (10X) AP Wash Buffer Concentrate (150X) Goat Anti-Mouse IgG-Coated Plate

96-Well Cover Sheet pNPP Substrate Solution

ELISA Tracer Dye ELISA Antiserum Dye

96 wells Quantity/Size 1 vial/100 dtn 1 vial/100 dtn

1 vial 1 vials/10 ml

1 vial/5 ml 1 plate 1 cover

2 vials/12 ml 1 vial 1 vial

If any of the items listed above are damaged or missing, please contact our Customer Service department at (800) 364-9897 or (734) 971-3335. We cannot accept any returns without prior authorization.

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WARNING: THIS PRODUCT IS FOR RESEARCH ONLY - NOT FOR HUMAN OR VETERINARY DIAGNOSTIC OR THERAPEUTIC USE.

GENERAL INFORMATION

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Safety Data

This material should be considered hazardous until further information becomes available. Do not ingest, inhale, get in eyes, on skin, or on clothing. Wash thoroughly after handling. Before use, the user must review the complete Safety Data Sheet, which has been sent via email to your institution.

Precautions

Please read these instructions carefully before beginning this assay.

The reagents in this kit have been tested and formulated to work exclusively with Cayman Chemical's ELISA Kits. This kit may not perform as described if any reagent or procedure is replaced or modified.

When compared to quantification by LC/MS or GC/MS, it is not uncommon for immunoassays to report higher analyte concentrations. While LC/MS or GC/MS analyses typically measure only a single compound, antibodies used in immunoassays sometimes recognize not only the target molecule, but also structurally related molecules, including biologically relevant metabolites. In many cases, measurement of both the parent molecule and metabolites is more representative of the overall biological response than is the measurement of a short-lived parent molecule. It is the responsibility of the researcher to understand the limits of both assay systems and to interpret their data accordingly.

If You Have Problems

Technical Service Contact Information

Phone:

888-526-5351 (USA and Canada only) or 734-975-3888

Fax:

734-971-3640

Email:

techserv@

In order for our staff to assist you quickly and efficiently, please be ready to supply the lot number of the kit (found on the outside of the box).

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GENERAL INFORMATION

Storage and Stability

This kit will perform as specified if stored as directed at -20?C and used before the expiration date indicated on the outside of the box.

Materials Needed But Not Supplied

1. A plate reader capable of measuring absorbance at 405 nm 2. Adjustable pipettes and a repeating pipettor 3. An orbital microplate shaker 4. A source of ultrapure water is recommended. Pure water - glass distilled or

deionized - may not be acceptable. NOTE: UltraPure Water is available for purchase from Cayman (Item No. 400000). 5. Materials used for Sample Preparation (see page 14)

GENERAL INFORMATION

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INTRODUCTION

Background

9-Tetrahydrocannabinol (9-THC) is the primary psychoactive chemical in Cannabis.1 Upon consumption, this cannabinoid (CB) acts as a partial agonist at both CB receptor 1 (CB1) and CB2.2,3 Its actions are analogous to the endogenous neurotransmitter anandamide when it binds to receptors and alters mental and physical functions in the body.4 Once in the liver, 9-THC is metabolized by the cytochrome P450 (CYP) isoforms CYP2C9, CYP2C19, and CYP3A4, to the psychoactive metabolite 11-hydroxy-9-THC.5,6 11-hydroxy-9-THC is then further oxidized to the non-psychoactive metabolite 11-nor-9-carboxy-9-THC. This carboxy form is the most abundant metabolite of 9-THC. For this reason, it is often used as the main urinary marker for Cannabis consumption.6

About This Assay

Cayman's THC Metabolite ELISA Kit is a competitive assay that can be used for quantification of the predominant THC metabolite, 11-nor-9-carboxy-9THC, in plasma, serum, and urine. The assay has a range from 0.017-5 ng/ml with a midpoint of approximately 0.295 ng/ml (50% B/B0) and a sensitivity of approximately 0.072 ng/ml (80% B/B0).

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INTRODUCTION

INTRODUCTION

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Principle of the Assay

This assay is based on the competition between free THC metabolite (11-nor9-carboxy-9-THC) and a THC metabolite-alkaline phosphatase conjugate (THC Metabolite-AP Tracer) for a limited amount of THC Metabolite Monoclonal Antibody. Because the concentration of the THC Metabolite AP-Tracer is held constant while the concentration of free THC metabolite varies, the amount of THC Metabolite-AP Tracer that is able to bind to the THC Metabolite Monoclonal Antibody will be inversely proportional to the concentration of free THC metabolite in the well. This antibody-THC metabolite complex binds to goat polyclonal anti-mouse IgG that has been previously attached to the well. The plate is washed to remove any unbound reagents and then pNPP Substrate Solution (which contains the substrate to AP) is added to the well. The product of this enzymatic reaction has a distinct yellow color and absorbs strongly at 405 nm. The intensity of this color, determined spectrophotometrically, is proportional to the amount of THC Metabolite-AP Tracer bound to the well, which is inversely proportional to the amount of free THC metabolite present in the well during the incubation, as described in the equation:

Absorbance [Bound THC Metabolite-AP Tracer] 1/[THC metabolite]

A schematic of this process is shown in Figure 1, on page 9.

Wells are pre-coated with goat an-mouse IgG and blocked with a proprietary formulaon of proteins.

1. Incubate with tracer, anbody, and either standard or sample.

= Goat an-mouse IgG = Blocking proteins = Alkaline phosphatase linked to THC metabolite (tracer) = Specific anbody to THC metabolite = Free THC metabolite

2. Wash to remove all unbound reagents.

3. Develop the well with pNPP.

Figure 1. Schematic of the THC Metabolite ELISA

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INTRODUCTION

INTRODUCTION

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