The high one biology is related to the Feilin reagent, which can react with the Feilin reagent

The Filin reagent is formulated from a solution of sodium hydroxide with a mass fraction of g ml and a solution of copper sulfate with a mass fraction of g ml. It is combined with soluble reducing sugars (glucose, fructose and maltose) when heated to produce a brick-red copper oxide precipitate. For this reason, Filin reagents are often used to identify the presence or absence of soluble reducing sugars.

The light blue color is copper sulphate.

The brick-red precipitate is a copper oxide precipitate.

Brown is the transition color.

It's been a few years since I went to college, and I forgot the equation, which you have to learn in your sophomore year of high school.

The light blue color is copper hydroxide, and the brick red color is cuprous oxide (copper oxide black).

Brown is probably an intermediate state.

Chemistry Elective 1 to be learned.

There are questions about aldehyde and hydroxyl groups.

The molecular formula of organic chemistry is difficult to write.

The light blue color is copper sulphate.

If you add it, it will turn crimson blue when it encounters a hydroxyl group.

Brown non-reactive.

The brick-red precipitate is a reaction with an aldehyde group to form a copper oxide precipitate.

Not copper oxide. It is cuprous oxide.

ch2oh(choh)4cho+2cu(oh)2→cu2o↓+ch2oh(choh)4cooh+2h2o

The light blue color is copper sulfate, the brown color is a mixed color, and the brick red precipitate is cuprous oxide.

In high school, as long as you know that reducing sugars react with copper sulfate to generate cuprous oxide precipitates, you don't need specific reaction formulas.

Cuprous oxide is red.

The light blue color is copper sulphate.

The brick-red precipitate is a copper oxide precipitate.

Brown is the transition color.

The reagents that can react with the Filin reagent are reducing sugars such as glucose, fructose, and disaccharides except sucrose. The reducing sugar contains an aldehyde group, and the Feilin reagent, that is, the copper hydroxide in the new system, has weak oxidation, and in the case of water bath heating, it reacts with the aldehyde group to oxidize the aldehyde group to a carboxyl group, and the copper hydroxide is reduced to a brick-red cuprous oxide, so there is a brick-red precipitate.

Extension: Fehling's reagent (Fehling'S solution) is a reagent that can identify reducing substances, generally composed of sodium hydroxide and copper sulfate solution, invented by German chemist Hermann von Ferling in 1849. Filin reagent is often used to identify the presence of soluble reducing sugars, which can react with reducing sugars to form brick-red precipitates.

Filin reagent is a common chemical reagent, the main component of which is phthalocyanine or iron salt (phenanthrolineferrous), also known as Fira reagent. It can be used to detect the amount of iron in water and can also be used for quantitative analysis.

The working principle of the Filin reagent is that after adding the Filin reagent to the water sample, the lead leaks, and the iron ions will complexe with the reagent to produce an organic substance, which will show a reddish color. Due to the widespread presence of iron ions in nature and life, the application of Feilin reagent is very wide. For example, it can be used to detect iron in drinking water and sewage, iron content in soil and plants, food, etc., and can also be used as one of the important reagents commonly used in chemical analysis.

In addition, the preservation of Filin reagent needs to pay attention to the following points:

1) The storage temperature should be lower than room temperature and avoid direct sunlight.

2) Avoid contact with other chemicals to prevent unnecessary chemical reactions affecting the quality of the reagent.

3) Clean the used reagent bottles, and try to avoid residual water traps and other sundries.

4) Check whether there is any abnormality such as color change or crystallization of Feilin reagent before use. Abnormal reagents should not be used to ensure the accuracy of the experiment.

Overall, proper storage of Filin reagents can extend their lifetime, ensure accurate results, and reduce the cost of failure.

Filin reagents are used to test reducing sugars.

The biuret reagent is used to test proteins.

Differences: (1) The concentration of the solution is different.

The solution in the Filin reagent is called Filin reagent A, and its concentration is called Filin reagent B, and its concentration is; The concentration of the solution in the biuret reagent (biuret reagent A) is, and the concentration of the solution (biuret reagent B) is.

2) The principle of use is different.

Fillin's reagent is a newly formulated solution that reacts with an aldehyde group under heating conditions and is reduced to a brick-red precipitate that can be used to identify the presence of soluble reducing sugars. When the soluble reducing sugar is identified with Filin reagent, the color change process of the solution is: light blue, brown, brick red (precipitate).

When identifying whether a protein is present in a biological tissue, the biuret method is commonly used, using a biuret reagent, and a biuret reaction occurs. The diuret reaction is essentially a purple reaction with the biuret reagent in an alkaline environment. The protein molecule contains many peptide bonds similar to the structure of biuret (), so the protein can have a color reaction with the biuret reagent, and the presence of protein can be identified with the biuret reagent.

3) Different ways to use it.

When the Feilin reagent is used, the reverse solution is mixed with the solution first (the drops of the solution are dropped into the solution), and then used immediately: when the biuret reagent is used, the solution (2ml) is added first, shaken and shaken well to create an alkaline reaction environment, and then add 3 or 4 drops of the solution, shake and observe the phenomenon.

Agree with the point of view upstairs, and add that the Filin reagent is a copper hydroxide reaction obtained by mixing the aldehyde group in the reducing sugar with the two components of the Filin reagent to generate a brick copper oxide red precipitate.

The Filin reagent is prepared from solution A (NaOH solution) and solution B (CuSO4 solution), and when the two are mixed, a light blue Cu(OH)2 precipitate is immediately generated. Cu(OH)2 and reducing sugars can generate brick-red Cu2O precipitates under the condition of heating in a 50 60 water bath.

It is made up of sodium hydroxide by mass fraction.

g ml of the solution and the mass fraction of copper sulphate is:

g ml of the solution, as well as potassium sodium tartrate. It is combined with soluble reducing sugars (glucose, fructose and maltose) under heated conditions to produce brick-red cuprous oxide precipitates.

CuSO4 + 2NaOH + CH3CHO = CH3COOH + Cu2O nucleus + Na2SO4;

with acetone. It does not react, just changes the beam of the Filin reagent.

Self-produced blue old clear color flocculent precipitation.

cuso4 + 2naoh = cu(oh)2 + na2so4

Answer: BCD Filin reagent mainly identifies reducing sugars, which refer to sugars with reducing properties. Among the sugars, monosaccharides containing free aldehyde groups or ketone groups in the molecule and disaccharides containing free aldehyde groups are both reducible. Reducing sugars mainly include glucose, fructose, galactose, lactose, maltose, etc.

The sugar that can reduce Fehling reagent (Benedict reagent) or Torrance (reagent is called reducing sugar, and all monosaccharides (except dihydroxyacetone), regardless of aldose and ketose, are reducing sugars. Most disaccharides are also reducing sugars, with the exception of sucrose. Filin reagent is a solution containing Cu2+ complex, which is reduced to obtain a brick-red Cu2O precipitate.

When the Torrens reagent is reduced, it can produce elemental silver, which undergoes a "silver mirror reaction".

Sugars that contain reducing groups (such as free aldehyde groups or free ketone groups) in their molecular structure are called reducing sugars. Such as glucose.

The sugar that can reduce Fehling reagent (Benedict reagent) or Torrance (reagent is called reducing sugar, and all monosaccharides (except dihydroxyacetone), regardless of aldose and ketose, are reducing sugars. Most disaccharides are also reducing sugars, with the exception of sucrose. Filin reagent is a solution containing Cu2+ complex, which is reduced to obtain a brick-red Cu2O precipitate.

When the Torrens reagent is reduced, it can produce elemental silver, which undergoes a "silver mirror reaction".

Sugars that contain reducing groups (such as free aldehyde groups or free ketone groups) in the molecular structure of acetone are called reducing sugars. Such as glucose.

The precipitates that can react with Feilin reagent to form Cu2O brick red precipitates are A formic acid and D acetaldehyde.

Film reagent is a designated reagent for the detection of fatty aldehydes. Benzoaldehyde is aromatic aldehyde, not aliphatic aldehyde, and does not react with film reagent, and acetone is ketone, which does not react with film reagent. Formic acid contains an aldehyde group, which can be regarded as an aldehyde group attached to a hydroxyl group and also has the properties of aldehydes.

Preparation method:

Dissolve in 200ml of water, acidify with concentrated sulfuric acid, and then dilute to 500ml with water for later use; Take 173g of potassium sodium tartrate, 71g

NaOH solid dissolved in 400ml of water, then diluted to 500ml, and mixed with the same volume of two solutions when using.

It is made up of sodium hydroxide by mass fraction.

g ml of the solution and the mass fraction of copper sulphate is:

g ml of the solution, as well as potassium sodium tartrate.

It is used in biology to detect reducing sugars.

It is heated with a reducing sugar water bath to precipitate brick-red