What is the purpose of trichloroacetic acid?

What is the purpose of trichloroacetic acid?

It is widely used in biochemistry for the precipitation of macromolecules, such as proteins, DNA, and RNA. TCA and DCA are both used in cosmetic treatments (such as chemical peels and tattoo removal) and as topical medication for chemoablation of warts, including genital warts. It can kill normal cells as well.

Which chemical is used to precipitate proteins?

ammonium sulfate
The most common salt for protein precipitation is ammonium sulfate, as described by Burgess (2009). It is one of the first of the series of lyotropic salts and probably the most effective for protein precipitation (Bull and Breese, 1980).

What is the final concentration of TCA to precipitate proteins?

TCA (trichloroacetic acid) is a very effective protein precipitant. TCA is added to the extract to a final concentration of 10–20% and the proteins are allowed to precipitate on ice for 30 min (46).

How do you do TCA precipitation?


  1. Add 0.11 volumes of ice-cold 100% TCA to the protein sample.
  2. Place on ice for 10 min.
  3. Add 500 µL of ice-cold 10% TCA to the sample.
  4. Place on ice for 20 min.
  5. Centrifuge at 20,000g for 30 min.
  6. Carefully remove the supernatant.
  7. Add 500 µL of acetone.
  8. Centrifuge at 20,000g for 10 min.

Why TCA is used for protein precipitation?

TCA is a relatively weak acid so it cannot hydrolyze the peptide bonds of proteins, but it does maintain an acidic pH in water. Addition of TCA to proteins in an aqueous solution disrupts the hydrogen-bonded water molecules (hydration sphere) surrounding a protein.

What is the pH of TCA?

The aqueous solution of TCA is strongly acidic, and the aqueous solution of 0.1 mol of solution having a pH of 1.2.

Which amino acid is used for precipitation of protein?

Trichloroacetic Acid (TCA) is commonly used for precipitation because it sees great results with a relatively low concentration (typically around ~15%).

Who is TCA?

Tricyclic antidepressants (TCAs) are a class of antidepressant medications that share a similar chemical structure and biological effects. Tricyclic antidepressants increase levels of norepinephrine and serotonin, two neurotransmitters, and block the action of acetylcholine, another neurotransmitter.

What is TCA method?

Trichloroacetic acid (TCA) precipitation of proteins is commonly used to concentrate protein samples or remove contaminants, including salts and detergents, prior to downstream applications such as SDS-PAGE or 2D-gels.

What is trichloroacetic acid made from?

Trichloroacetate, or trichloroacetic acid, is a strong acid prepared by the reaction of chlorine with acetic acid in the presence of a suitable catalyst. In clinical chemistry and biochemistry, it is used as a precipitant of macromolecules including proteins, DNA and RNA.

Why is trichloroacetic acid used in chemical analysis?

Trichloroacetic acid is used in biochemistry to precipitate macromolecules such as DNA, RNA, and proteins. It is used in microscopy as a fixative and decalcifier. Used as a reagent in organic synthesis to detect albumin, medicine, and herbicides. Used in the chemoablation of warts.

What does TCA do to proteins?

TCA precipitation denatures the protein, so it should not be used if the protein must remain in its folded state (e.g., if you want to measure a biochemical activity of the protein).

What is the purpose of TCA / acetone precipitation?

TCA/acetone precipitation is a common method for precipitation and 46concentration of total proteins, initially developed by Damerval et al. [12] and then modified for 47use in various tissues[10, 13-19]. 48 TCA/acetone precipitation is thought to minimize protein degradation and proteases activity as

Why is TCA less effective in protein precipitation?

Mechanism underlying TCA-induced protein precipitation. In addition, TCA appears to be less effective in precipitating proteins in the disordered/unfolded state (s). This observation is of immense significance because about 30% of proteins in the eukaryotic proteome are predicted to be disordered/unstructured.

What kind of proteins are affected by TCA?

The protein precipitation effects of TCA were studied on four proteins [lysozyme, acidic fibroblast growth factor (aFGF), carbonic anhydrase, and bovine serum albumin] with varying isoelectric points and molecular masses.

What is the role of trichloroacetate in protein precipitation?

Role of the trichloroacetate group in protein precipitation. However, protein solutions containing 15–30% STCA turned mildly turbid after 4 h of incubation at room temperature. SDS-PAGE of the precipitate formed in STCA showed that a maximum of 25% of the protein (aFGF) was precipitated in 20% w/v STCA.

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