胰蛋白酶(猪源)Trypsin from Porcine

• 产品编号：0215357125      品牌：MP       原厂货号：0215357125
• 产品分类：细胞,细胞培养与转染试剂 > 细胞解离试剂 > 胰蛋白酶
• 应用分类：暂定分类 > 细胞解离试剂

描述：

From Porcine Pancreas
Activity: >250 U/mg
Virus Free
White powder
γ-irradiated to inactivate viral contaminants.

Inhibitors: Trypsin is inhibited by organophosphorus compounds such as diisopropyl fluorophosphate and natural trypsin inhibitors from pancreas, soybean, lima bean and egg white. Silver ions are also potent inhibitors. Specific inhibitors are AEBSF, antipain, aprotinin, DFP, leupeptin, PMSF, TLCK, and Trypsin Inhibitor.

Specificity: The protease activity of trypsin is highly specific toward positively charged side chains with lysine and arginine.^11,16 Forms complexes with a2-macroglobulin.⁹ Can be used in the isolation of intact, detergent-free phycobilisomes¹⁰ and in the hydrolysis/condensation of carboxylic ester bonds.¹⁵

Solutions: Solutions of trypsin should be thawed and swirled gently to mix. Solutions are relatively stable for periods of up to three months under refrigeration. If longer storage is desired, the concentrate should be aliquoted and refrozen. Thawed concentrate may contain a small amount of precipitate; this is normal and in no way will affect the efficacy of the product.
 

Formulation (for #16893 - Trypsin 1:250 in Hanks' Balanced Salt Solution without Magnesium and Calcium):

Formulation (for #16894 - Trypsin 1:300, 0.25% Solution in HBS Solution (Modified) with 200 IU/ml Penicillin and 100 µg/ml Streptomycin, with 0.50 g/l Sodium Bicarbonate, without Calcium, Magnesium, and Phenol Red):

Typical Procedures for the Removal of Adherent Cells from a Culture Surface:

Cells are most commonly removed from the culture substrate by treatment with trypsin, or trypsin-EDTA. If trypsin is being solubilized or diluted from a concentrated solution, it is important to use a buffered salt solution that contains no calcium or magnesium such as Hank's Balanced Salt Solution, Modified (MP catalog number 1810554 [1X HBS without calcium, magnesium and phenol red]). Adjust the pH of trypsin solution to 7.4 to 7.6.

EDTA is added to some trypsin solutions to intensify enzyme activity by chelating calcium and magnesium, thereby de-stabilizing the intercellular matrix.

Method 1:

1. Remove medium from culture vessel by aspiration and wash the monolayer with calcium and magnesium free salt solution to remove all traces of serum. Remove the salt solution by aspiration.

2. Dispense enough trypsin-EDTA solution into culture vessel(s) to completely cover the monolayer of cells.
 

• 
  
  

  Balanced Salt Solution without calcium, magnesium or phenol red	500 ml
  Trypsin	10 ml (typically a 2.5% w/v solution)
  EDTA	5 ml of a 2% w/v solution

  Trypsin-EDTA solution:

3. Pass the Trypsin/EDTA solution over the monolayer several times, by gently racking the flasks, and decant. Do not allow the Trypsin/EDTA solution to be in contact with the monolayer for longer than 30 seconds.
 

NOTE: The time required to remove cells from the culture surface is dependent on cell type, population density, serum concentration in the growth medium, potency of trypsin and time since last subculture. Trypsin causes cellular damage and time of exposure should be kept to a minimum.

4. Lay the flask flat and incubate at room temperature until the cells detach. Flasks which have been trypsinized should be inspected regularly to prevent the cells from remaining in the trypsin/EDTA for longer than is required.

5. Wash the cells off the base of the flask with 10 ml of the required growth medium, taking special care with cells which may still be adhering to the sides and shoulders.

6. Aspirate the cell suspension carefully to break down any cell aggregates. Avoid excessive frothing.

7. Proceed as per experimental protocol or split cells as required for stock.

8. At all times be aware of the possibility of cross contamination. NEVER mix caps or reuse a pipette.

Method 2:

Volumes given are for a 25 cm² T-Flask.

1. Decant supernatant fluid from the culture plate into a waste collection jar, taking care to use sterile technique.

2. Add 3 ml of cold trypsin (as per method 1, step 2) to the culture flask.

3. Incubate for 30 seconds (or longer, if necessary). Examine at low magnification. When it appears that some of the cells have rounded up, but have yet to detach, decant the trypsin into a waste container. Continue to incubate the flask until virtually all cells have rounded up and can be readily dislodged.

4.

a. Using a 10 ml pipette, add 10 mls fresh MEM (i.e. MP catalog number 12102) to the T-flask. Dispensing the MEM as a strong stream will aid in dislodging the cells.
•  
  Note: 10 mls is sufficient for a 1:2 split.

b. Using the same pipette, draw up the cell suspension and quickly dispense a 5 ml aliquot into two 25 cm2 T-Flasks (one new, one old).

5. Incubate. Monitor the flasks periodically, beginning 30-45 minutes after inoculation. Rapid attachment (within about 1 hour) is indicative that the split has been successful.

6. Continue to monitor the culture's progress (i.e. "eyeball" the culture).

Method 3:

1. Drain and discard spent medium from the culture vessel (flask, petri dish, etc.).

2. Add a calcium and magnesium free balanced salt solution to the side of the culture vessel opposite the cells and gently swirl vessel to rinse cells. Aspirate the salt solution rinse to remove.

3. Add the trypsin solution to the side of the vessel opposite the cells (approximately 3 ml/25 ml flask) and gently swirl the vessel to cover the monolayer completely. Let cells sit for 1-2 minutes, and remove trypsin (NOTE: Before aspirating trypsin solution, make sure the monolayer is still intact.) Using trypsin at 4°C minimizes cell detachment at this phase.

4. Incubate cells for 1-2 minutes until the cells begin to round up. When the vessel is tilted, the monolayer should slide down the surface (timing may vary but it usually takes 5 to 15 minutes). Monitor the cells carefully. Forcing the cells to detach prematurely could result in clumping. Leaving trypsin too long will cause cell damage. A gentle tap may facilitate removal of more difficult to remove cell lines.

5. After detachment, drain cells to one side of the vessel. Add complete (i.e. containing serum) cell culture medium (approximately 0.1 to 0.2 ml per cm²) or under serum free conditions, add a trypsin inhibitor, to neutralize the action of the trypsin. Disperse cells into suspension by pipetting repeatedly. The amount and intensity of pipetting will vary from one cell to another. Too vigorous pipetting may cause cell damage. If cells are too difficult to disperse without causing damage to cells, a stronger dissociating solution may be needed.

Typical Assay (BAEE activity):²

Principle:



Conditions:

T = 25°C
pH = 7.6
A253 nm
Light Path = 1 cm

Method: Continuous Spectrophotometric Rate Determination

Reagents:

A. 67 mM Sodium Phosphate Buffer, pH 7.6 at 25°C (Prepare 100 ml in deionized water using Sodium Phosphate Monobasic, Anhydrous, MP catalog number 195500. Adjust to pH 7.6 at 25°C with 1 M NaOH, MP catalog number 1688145).

B. 0.25 mM N-a-Benzoyl-L-Arginine Ester Solution (BAEE) (Prepare 50 ml in Reagent A using N-a-Benzoyl-L-Arginine Ethyl Ester Hydrochloride, MP catalog number 100088).

C. 1 mM Hydrochloric Acid Solution (HCl) (Prepare 50 ml in deionized using concentrated hydrochloric acid, MP catalog number 194054).

D. Trypsin Enzyme Solution (Immediately before use, prepare a solution containing 500 BAEE units/ml of Trypsin in cold Reagent C.)

Procedure:

Pipette the following reagents into suitable quartz cuvettes:

	Test	Blank
Reagent B (BAEE Solution)	3.00 ml	3.00 ml

Equilibrate to 25°C. Monitor the A₂₅₃ nm until constant, using a suitably thermostatted spectrophotometer. Then add:

 

Immediately mix by inversion and record the increase in A_{253 nm} for approximately 5 minutes. Obtain the DA_{253 nm}/minute using the maximum linear rate for both the Test and Blank.

Final Assay Conditions:

In a 3.2 ml reaction mix, the final concentrations are 63 mM sodium phosphate, 0.23 mM BAEE, 0.06 mM hydrochloric acid and 100 units trypsin.

Calculations:




Typical Assay (TAME unit):

Reagents:

A. 0.046 M Tris-HCl buffer, pH 8.1 with 0.0115 M calcium chloride.

B. 0.01 M TAME (N-a-p-Tosyl-L-arginine methyl ester hydrochloride, MP catalog number 103086)

C. 0.001 N HCl

D. Trypsin Enzyme Solution: Just before use dilute to a concentration of 10-20 ug/ml in Reagent C (HCl).
 

• mg of trypsin/ml = A280 × 0.70

Procedure:

Set spectrophotometer at 247 nm and 25°C.

Pipette into each cuvette as follows:

Incubate in spectrophotometer at 25°C for 3-4 minutes to achieve temperature equilibration and establish a blank rate, if any. Add 0.1 ml diluted enzyme and record A₂₄₇ for 3 to 4 minutes. Determine DA₂₄₇ from initial linear portion of the curve. The reaction remains linear to an A₂₄₇ of about 0.320. The reaction should be linear for at least three minutes. If this is not so repeat using less enzyme.

Calculation:



Typical Assay (USP/NF):¹⁹

Reagents:

A. 0.067 M phosphate buffer, pH 7.6: Dissolve 4.54 g of monobasic potassium phosphate in water to make 500 ml of solution. Dissolve 4.73 g of anhydrous dibasic sodium phosphate in water to make 500 ml of solution. Mix 13 ml of the monobasic potassium phosphate solution with 87 ml of the anhydrous dibasic sodium phosphate solution.

B. Substrate Solution: Dissolve 85.7 mg of N-benzoyl-L-arginine ethyl ester hydrochloride (BAEE, MP catalog number 100088), suitable for use in assaying crystallized trypsin, in water to make 100 ml. Dilute 10 ml of this solution with 0.067 M phosphate buffer, pH 7.6 to 100 ml. Determine the absorbance of this solution, in a 1 cm cell, at 253 nm, in a suitable spectrophotometer equipped with thermospacers to maintain a temperature of 25 ± 0.1°C, using water as the blank. By the addition of 0.067 M phosphate buffer, pH 7.6, or of the Substrate solution before dilution, adjust the absorbance so that is measures not less than 0.575 and not more than 0.585. Use this substrate solution within 2 hours.

C. Crystallized Trypsin Solution: Dissolve a sufficient quantity of crystallized trypsin, accurately weighed, in 0.0010 N hydrochloric acid to obtain a solution containing about 50 to 60 USP trypsin units per ml.

Procedure:

Pipet 200 ul of 0.0010 N hydrochloric acid and 3.0 ml of the substrate solution into a 1 cm cell. Place this cell in a spectrophotometer, and adjust the instrument so that the absorbance reads 0.050 at 253 nm. Pipet 200 ul of crystallized trypsin solution, containing 10 to 12 USP trypsin units, into another 1 cm cell, add 3.0 ml of substrate solution, and place the cell in the spectrophotometer. At the time the substrate solution is added, start a stopwatch, and read the absorbance at 30 second intervals for 5 minutes. Repeat the procedure on the same dilution at least once. Plot a curve of absorbance against time, and use only those values that form a straight line to determine the activity of the crystallized trypsin. If the rate of change does not remain constant for at least 3 minutes, repeat the run, and if necessary, use a lower concentration. One USP trypsin unit is the activity causing a change in absorbance of 0.003 per minute under the conditions specified in this Assay. Calculate the number of USP trypsin units per mg taken by the formula:
 

• (A1 - A2)/(0.003TW),

in which A₁ is the absorbance straight-line final reading, A₂ is the absorbance straight-line initial reading, T is the elapsed time, in minutes, between the initial and final readings, and W is the weight, in mg, of crystallized trypsin in the volume of solution used in determining the absorbances.
 

胰蛋白酶：本品为蛋白质水解酶，能选择地水解蛋白质中由赖氨酸或精氨酸的羧基所构成的肽链，能消化溶解变性蛋质，对未变性的蛋白质无作用，因此，能使脓、痰液、血凝块等分解、变稀，易于引流排除，加速创面净化，促进肉芽组织新生，此外还有抗炎症作用。临床上用于脓胸、血胸、外科炎症、溃疡、创伤性损伤、瘘管等所产生的局部水肿、血肿及脓肿等。喷雾吸入，用于呼吸道疾病。也可用于治疗毒蛇咬伤。还常用于动物细胞培养前对组织的处理。
1. 称取胰蛋白酶：按胰蛋白酶液浓度为 0.25 %，用电子天平准确称取粉剂溶入小烧杯中的双蒸水（若用双蒸水需要调 PH 到 7.2 左右）或 PBS （ D-hanks ）液中。搅拌混匀，置于 4℃ 内过夜。

原厂资料：

注意事项：

Activity:

One BAEE unit will produce a DA₂₅₃ of 0.001 per minute at pH 7.6 at 25°C using BAEE as substrate. Reaction volume = 3.2 ml (1 cm light path).

One TAME unit hydrolyzes 1 umole of p-toluene-sulfonyl-L-arginine methyl ester (TAME) per minute at 25°C, pH 8.2, in the presence of 0.001 M calcium ion.

One USP trypsin unit is the activity causing a change in absorbance of 0.003 per minute under the conditions specified.

Activity Conversion:

1 TAME unit = 19.2 USP or NF units = 57.5 BAEE Units

Composition: Trypsin is composed of two subunits, a-trypsin and b-trypsin. a-Trypsin is composed of two peptide chains and b-trypsin is composed of one chain.