ab Lipase Activity Assay Kit (Colorimetric)

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1 ab Lipase Activity Assay Kit (Colorimetric) Instructions for Use For the rapid, sensitive and accurate measurement of lipase activity in various samples. This product is for research use only and is not intended for diagnostic use. Version 6 Last Updated 16 April 2015

2 Table of Contents INTRODUCTION 1. BACKGROUND 2 2. ASSAY SUMMARY 3 GENERAL INFORMATION 3. PRECAUTIONS 4 4. STORAGE AND STABILITY 4 5. MATERIALS SUPPLIED 5 6. MATERIALS REQUIRED, NOT SUPPLIED 5 7. LIMITATIONS 6 8. TECHNICAL HINTS 7 ASSAY PREPARATION 9. REAGENT PREPARATION STANDARD PREPARATION SAMPLE PREPARATION 11 ASSAY PROCEDURE and DETECTION 12. ASSAY PROCEDURE and DETECTION 13 DATA ANALYSIS 13. CALCULATIONS TYPICAL DATA 17 RESOURCES 15. QUICK ASSAY PROCEDURE TROUBLESHOOTING FAQ INTERFERENCES NOTES 23 Discover more at 1

3 INTRODUCTION 1. BACKGROUND Lipase Activity Assay Kit, (ab102524) hydrolyzes a triglyceride substrate to form glycerol which is quantified enzymatically by via monitoring a linked change in the OxiRed probe absorbance (λ = 570nm). This assay is rapid, simple, sensitive, and reliable, as well as, suitable for high throughput activity screening of lipase. This kit detects lipase activity as low as 0.02 mu per well. Lipases perform essential roles in the digestion, transport and processing of dietary lipids (e.g. fats and oils) in living organisms. In humans, pancreatic lipase is the key enzyme responsible for breaking down fats in the digestive system by converting triglyceride to monoglyceride and free fatty acid. Pancreatic lipase monitoring is also used to help diagnose Crohn's disease, cystic fibrosis and celiac disease. Damage to the pancreas can exhibit a 5-10 fold increase of serum lipase levels within 24 to 48 hours. Discover more at 2

4 INTRODUCTION 2. ASSAY SUMMARY Standard curve preparation Sample preparation Add reaction mix and incubate at RT for 30 min Measure optical density (OD 570 nm) in a kinetic mode Incubate at 37 C for mins Measure optical density (OD 570 nm) in a kinetic mode Discover more at 3

5 GENERAL INFORMATION 3. PRECAUTIONS Please read these instructions carefully prior to beginning the assay. All kit components have been formulated and quality control tested to function successfully as a kit. Modifications to the kit components or procedures may result in loss of performance. 4. STORAGE AND STABILITY Store kit at -20ºC in the dark immediately upon receipt. Kit has a storage time of 1 year from receipt, providing components have not been reconstituted. Refer to list of materials supplied for storage conditions of individual components. Observe the storage conditions for individual prepared components in section 5. Aliquot components in working volumes before storing at the recommended temperature. Reconstituted components are stable for 2 months. Discover more at 4

6 GENERAL INFORMATION 5. MATERIALS SUPPLIED Item Amount Storage Condition (Before Preparation) Storage Condition (After Preparation) Lipase Assay Buffer 25 ml -20 C -20 C OxiRed (in DMSO) 200 µl -20 C -20 C Enzyme Mix (lyophilized) 1 vial -20 C -20 C Lipase Substrate 400 µl -20 C -20 C Glycerol Standard (100 mm) 200 µl -20 C -20 C Lipase Positive Control (lyophilized) 1 vial -20 C -20 C 6. MATERIALS REQUIRED, NOT SUPPLIED These materials are not included in the kit, but will be required to successfully perform this assay: MilliQ water or other type of double distilled water (ddh 2 O) PBS Microcentrifuge Pipettes and pipette tips Colorimetric microplate reader equipped with filter for OD570 nm 96 well plate: clear plates for colorimetric assay Heat block or water bath Dounce homogenizer or pestle (if using tissue) Calcium (1 5 mm) Discover more at 5

7 GENERAL INFORMATION 7. LIMITATIONS Assay kit intended for research use only. Not for use in diagnostic procedures. Do not use kit or components if it has exceeded the expiration date on the kit labels. Do not mix or substitute reagents or materials from other kit lots or vendors. Kits are QC tested as a set of components and performance cannot be guaranteed if utilized separately or substituted. Discover more at 6

8 GENERAL INFORMATION 8. TECHNICAL HINTS This kit is sold based on number of tests. A test simply refers to a single assay well. The number of wells that contain sample, control or standard will vary by product. Review the protocol completely to confirm this kit meets your requirements. Please contact our Technical Support staff with any questions. Keep enzymes, heat labile components and samples on ice during the assay. Make sure all buffers and solutions are at room temperature before starting the experiment. Samples generating values higher than the highest standard should be further diluted in the appropriate sample dilution buffers. Avoid foaming or bubbles when mixing or reconstituting components. Avoid cross contamination of samples or reagents by changing tips between sample, standard and reagent additions. Ensure plates are properly sealed or covered during incubation steps. Ensure complete removal of all solutions and buffers from tubes or plates during wash steps. Make sure you have the right type of plate for your detection method of choice. Make sure the heat block/water bath and microplate reader are switched on. Discover more at 7

9 ASSAY PREPARATION 9. REAGENT PREPARATION Briefly centrifuge small vials at low speed prior to opening. 9.1 Lipase Assay Buffer: Ready to use as supplied. Equilibrate to room temperature before use. Store at -20 C. 9.2 Lipase Probe in DMSO: Ready to use as supplied. Warm by placing in a 37 C bath for 1 5 minutes to thaw the DMSO solution before use. NOTE: DMSO tends to be solid when stored at -20 C, even when left at room temperature, so it needs to melt for few minutes at 37 C. Aliquot probe so that you have enough volume to perform the desired number of assays. Store at -20 C protected from light. Once the probe is thawed, use with two months. 9.3 Lipase Enzyme Mix: Reconstitute with 200 µl Assay Buffer. Aliquot enzyme mix so that you have enough volume to perform the desired number of assays. Store at -20 C. 9.4 Lipase Substrate: Freezing may cause the substrate to separate from the aqueous phase. To re-dissolve the substrate, keep the cap tightly closed, thaw then place in a hot water bath C for 1 minute until the substrate looks cloudy. Vortex for 30 seconds. The substrate should be clear. Repeat heat and vortex one more time the substrate is now completely in solution, and ready for use. Aliquot substrate so that you have enough volume to perform the desired number of assays. Store at -20 C protected from light. 9.5 Lipase Standard (100 mm): Ready to use as supplied. Aliquot standard so that you have enough volume to perform the desired number of assays. Store at -20 C. Discover more at 8

10 ASSAY PRE ASSAY PREPARATION 9.6 Lipase Positive Control: Reconstitute with 100 µl Assay Buffer. Aliquot control so that you have enough volume to perform the desired number of assays. Store at -20 C. Keep on ice whilst in use. Dilute 15 µl of reconstituted Lipase in 135 µl of Assay Buffer for use in assay. Discover more at 9

11 ASSAY PRE ASSAY PREPARATION 10.STANDARD PREPARATION Always prepare a fresh set of standards for every use. Diluted standard solution is unstable and must be used within 4 hours For the colorimetric assay: Prepare a 1mM Lipase standard by diluting 10 µl of the provided Glycerol standard with 990 µl of Assay Buffer. Mix well Using 1mM Lipase standard, prepare standard curve dilution as described in the table in a microplate or microcentrifuge tubes: Standard # Volume of Standard (µl) Assay Buffer (µl) Final volume standard in well (µl) End [Lipase] in well nmol/well nmol/well nmol/well nmol/well nmol/well nmol/well Each dilution has enough amount of standard to set up duplicate readings (2 x 50 µl). Discover more at 10

12 ASSAY PRE ASSAY PREPARATION 11.SAMPLE PREPARATION General Sample information: We recommend performing several dilutions of your sample to ensure the readings are within the standard value range. We recommend that you use fresh samples. If you cannot perform the assay at the same time, we suggest that you complete the Sample Preparation step before storing the samples. Alternatively, if that is not possible, we suggest that you snap freeze cells or tissue in liquid nitrogen upon extraction and store the samples immediately at -80 C. When you are ready to test your samples, thaw them on ice. Be aware however that this might affect the stability of your samples and the readings can be lower than expected Cell (adherent or suspension) samples: Harvest the amount of cells necessary for each assay (initial recommendation = 2 x 10 6 cells) Wash cells with cold PBS Resuspend cells in 100 µl of Assay Buffer Homogenize cells quickly by pipetting up and down a few times Centrifuge sample for 2 5 minutes at 4 C at top speed using a cold microcentrifuge to remove any insoluble material Collect supernatant and transfer to a clean tube Keep on ice Tissue samples: Harvest the amount of tissue necessary for each assay (initial recommendation = 40 mg) Wash tissue in cold PBS Resuspend tissue in 100 µl of Assay Buffer. Discover more at 11

13 ASSAY PRE ASSAY PREPARATION Homogenize tissue with a Dounce homogenizer sitting on ice, with passes Centrifuge samples for 2 5 minutes at 4 C at top speed using a cold microcentrifuge to remove any insoluble material Collect supernatant and transfer to a clean tube Keep on ice Plasma, Serum and Urine and other biological fluids: Liquid samples can be assayed directly or after dilution in the Assay Buffer. NOTE: We suggest using different volumes of sample to ensure readings are within the Standard Curve range Discover more at 12

14 ASSAY PROCEDURE and DETECTION 12.ASSAY PROCEDURE and DETECTION Equilibrate all materials and prepared reagents to room temperature prior to use. It is recommended to assay all standards, controls and samples in duplicate. Glycerol in the sample will interfere with the assay. It is corrected for by using a substrate deficient control for the sample. Some lipases require calcium. If your lipase requires calcium avoid EGTA in sample preparation and add calcium (1 5 mm) to the lipase assay buffer before use Set up Reaction wells: - Standard wells = 50 µl standard dilutions. - Sample wells = 1-50 µl samples (adjust volume to 50 µl/well with Assay Buffer). - Background control sample wells= 1 50 µl samples (adjust volume to 50 µl/well with Assay Buffer). - Positive control = 50 μl/well Reaction Mix: Prepare 100 µl of Reaction Mix for each reaction Component Colorimetric Reaction Mix (µl) Control Reaction Mix (µl) Assay Buffer OxiRed Probe 2 2 Enzyme Mix 2 2 Lipase Substrate 3 0 Mix enough reagents for the number of assays (samples, standards and background control) to be performed. Prepare a master mix of the Reaction Mix to ensure consistency. We recommend the following calculation: X µl component x (Number samples + standards +1) Discover more at 13

15 ASSAY PRE ASSAY PROCEDURE and DETECTION 12.3 Add 100 µl of Reaction Mix to each standard, positive control and sample wells. Mix well Add 100 µl Control reaction mix to the well Background control sample wells. Mix well Incubate at room temperature for 30 minutes protected from light Measure output on a microplate reader at 570 nm at T 1 to read A Incubate the reaction at again at 37 C for minutes (or longer if the lipase activity is low) protected from light Measure output on a microplate reader at 570 nm at T 2 to read A 2. Discover more at 14

16 DATA ANALYSIS 13.CALCULATIONS Samples producing signals greater than that of the highest standard should be further diluted in appropriate buffer and reanalyzed, then multiplying the concentration found by the appropriate dilution factor. For statistical reasons, we recommend each sample should be assayed with a minimum of two replicates (duplicates) Average the duplicate reading for each standard and sample If the sample background control is significant, then subtract the sample background control from sample reading Subtract the mean absorbance value of the blank (Standard #1) from all standard and sample readings. This is the corrected absorbance Plot the corrected absorbance values for each standard as a function of the final concentration of glycerol Draw the best smooth curve through these points to construct the standard curve. Most plate reader software or Excel can plot these values and curve fit. Calculate the trendline equation based on your standard curve data (use the equation that provides the most accurate fit) OD generated by oxidation of glycerol is: ΔA 570nm = A 2 -A 1. Apply the ΔA 570nm to the glycerol standard curve to get B nmol of glycerol (glycerol amount generated between T 1 and T 2 in the reaction wells) Glycerol generated (nmol/min/ml = mu/ml) in the test samples is calculated as: Lipase activity = ( B x Dilution Factor (T 2 T 1 )x V ) Discover more at 15

17 DATA ANALYSIS Where: B = Amount of glycerol in the sample well (nmol). T 1 = Time of first ready (A 1 ) (minutes). T 2 = Time of first ready (A 2 ) (minutes). V = Pretreated sample volume added into the reaction well (ml). Unit definition: One unit is defined as the amount of lipase that hydrolyzes triglyceride to yield 1.0 µmol of glycerol per minute at 37 C. Discover more at 16

18 DATA ANALYSIS 14.TYPICAL DATA TYPICAL STANDARD CURVE Data provided for demonstration purposes only. A new standard curve must be generated for each assay performed. Figure 1. Typical glycerol standard calibration curve using colorimetric reading. Figure 2: Colorimetric time course assay. Discover more at 17

19 RESOURCES 15.QUICK ASSAY PROCEDURE NOTE: This procedure is provided as a quick reference for experienced users. Follow the detailed procedure when performing the assay for the first time. Prepare standard, positive control, substrate and enzyme mix (aliquot if necessary); get equipment ready. Prepare standard curve. Prepare samples in duplicate (find optimal dilutions to fit standard curve readings). Set up plate for standard (50 µl), samples (50 µl) and background wells (50 µl). Prepare 100 µl Lipase Reaction Mix (Number samples + standards + 1). Component Colorimetric Reaction Mix (µl) Control Reaction Mix (µl) Assay Buffer OxiRed Probe 2 2 Enzyme Mix 2 2 Lipase Substrate 3 0 Add 100 µl of Reaction Mix to sample and standard wells. Add 100 µl Control Reaction Mix to background control wells. Incubate plate at RT 30 min protected from light. Measure output (A 1 ) on a microplate reader at time (T 1 ), at OD570 nm. Incubate at 37 C for mins protected from light. Measure output (A 2 ) on a microplate reader at time (T 2 ), at OD570 nm. Discover more at 18

20 RESOURCES 16.TROUBLESHOOTING Problem Cause Solution Assay not working Sample with erratic readings Lower/ Higher readings in samples and Standards Use of ice-cold buffer Plate read at incorrect wavelength Use of a different 96- well plate Samples not deproteinized (if indicated on protocol) Cells/tissue samples not homogenized completely Samples used after multiple free/ thaw cycles Use of old or inappropriately stored samples Presence of interfering substance in the sample Improperly thawed components Allowing reagents to sit for extended times on ice Incorrect incubation times or temperatures Buffers must be at room temperature Check the wavelength and filter settings of instrument Colorimetric: Clear plates Fluorometric: black wells/clear bottom plate Use PCA precipitation protocol for deproteinization Use Dounce homogenizer, increase number of strokes Aliquot and freeze samples if needed to use multiple times Use fresh samples or store at - 80 C (after snap freeze in liquid nitrogen) till use Check protocol for interfering substances; deproteinize samples Thaw all components completely and mix gently before use Always thaw and prepare fresh reaction mix before use Verify correct incubation times and temperatures in protocol Discover more at 19

21 RESOURCES Problem Cause Solution Standard readings do not follow a linear pattern Unanticipated results Pipetting errors in standard or reaction mix Air bubbles formed in well Standard stock is at incorrect concentration Measured at incorrect wavelength Samples contain interfering substances Sample readings above/ below the linear range Avoid pipetting small volumes (< 5 µl) and prepare a master mix whenever possible Pipette gently against the wall of the tubes Always refer to dilutions on protocol Check equipment and filter setting Troubleshoot if it interferes with the kit Concentrate/ Dilute sample so it is within the linear range Discover more at 20

22 RESOURCES 17.FAQ Discover more at 21

23 RESOURCES 18.INTERFERENCES These chemicals or biological materials will cause interferences in this assay causing compromised results or complete failure RIPA: contains SDS which can destroy/decrease the activity of the enzyme. Discover more at 22

24 RESOURCES 19.NOTES Discover more at 23

25 RESOURCES Discover more at 24

26 RESOURCES Discover more at 25

27 RESOURCES Discover more at 26

28 UK, EU and ROW Tel: +44-(0) Austria Tel: France Tel: Germany Tel: Spain Tel: Switzerland Tel (Deutsch): Tel (Français): US and Latin America Tel: ABCAM (22226) Canada Tel: China and Asia Pacific Tel: ( 中國聯通 ) Japan Tel: +81-(0) Copyright 2015 Abcam, All Rights Reserved. The Abcam logo is a registered trademark. All information / detail is correct at time of going to print. Discover more at 27

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