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Qualitative Tests, Structure and Uses of Benzaldehyde, Vanillin, Cinnamaldehyde

Benzaldehydes such as benzaldehyde (C6H5CHO) are aromatic aldehydes, formed from benzene rings bearing formyl (-CHO) substituents.

Benzaldehyde

Structure

Benzaldehydes such as benzaldehyde (C6H5CHO) are aromatic aldehydes, formed from benzene rings bearing formyl (-CHO) substituents. Organic compounds such as this one can be used in the manufacture of dyes, flavouring agents, perfumes, as well as a variety of other organic compounds. A naturally occurring aromatic aldehyde found naturally in glycoside amygdalin, it is characterized by a distinctive odour and taste similar to almond oil. In IUPAC terms, this compound is benzenecarbaldehyde, whose molecular formula is C7H6O. Benzenedicarboxaldehyde can also be called phenyl-methanal or benzoic aldehyde. There's a smell of almonds in the liquid and it's clear. Ether, alcohol, and volatile oils can be miscible with it. It has a solubility of 3 g/L and is therefore slightly soluble in water because it is denser.

Benzaldehyde is a compound composed of an aldehyde group and a benzene ring. A benzene ring is replaced by an aldehyde group in the structure of benzaldehyde. The benzaldehyde molecule consists of 14 sigma bonds, formed by atomic orbitals overlapping head-to-head.

Uses

Aromatic compounds, such as benzaldehyde, have an odor reminiscent of almonds. Natural sources of toluene can be tapped, as can it be manufactured by liquid phase chlorination of toluene. There is no difference in the chemical properties of the two types of benzaldehyde.

Chemical companies commonly use benzaldehyde in their products. There are also other items that contain it. Benzaldehyde is used in a number of important applications, including:
  • Benzaldehyde is usually used to flavor foods with almond flavor.
  • Certain cosmetics and personal care products contain benzaldehyde.
  • Benzaldehyde is also used in dye manufacturing (including acridine and aniline dyes), soap manufacturing, and odor control.
  • You can also use almond extract in cakes and baked goods. The preservative benzaldehyde also serves as an antibacterial and antifungal.
  • In the synthesis of compounds such as cinnamic acid and benzoic acid, it functions as an intermediary product.
  • Solvents, resins, ethers, and oils can all be dissolved in water.
As a result of its taste and fragrance, benzaldehyde is widely used in several industries.

Qualitative tests

Schiff's test for benzaldehyde

To 1 mL of Schiff's reagent, add 1 drop (30 mg) of the unknown (benzaldehyde). Within 10 minutes, aldehydes will appear magenta. Compare the color of your unknown with the color of an aldehyde you know.

Reagent used - p-rosaniline hydrochloride (fuchsin) 0.1% aqueous solution: Prepare 50 mL. 2 mL of sodium bisulfite aqueous solution should be added. One mL of concentrated hydrochloric acid should be added after one hour.

Vanillin

Structure

C8H8O3 is the Molecular Formula of vanilla, an organic compound. Phenolic aldehydes make up vanillin. Aldehydes, hydroxyls, and ethers are its functional groups. The extract of the vanilla bean contains these compounds as the primary component. The use of synthetic vanillin as an ingredient in food, beverages, and pharmaceuticals has become more prevalent than natural vanilla extract.

Uses

In flavorings, perfumes, foods, and pharmaceutical products, it is used. Many drugs and other products are manufactured using vanillin as an intermediate. As a flavor additive, vanillin can be found in food products and perfumes. Vanillin is also found in cosmetics and perfumes.

Qualitative tests

Schiff's test for vanillin

To 1 mL of Schiff's reagent, add 1 drop (30 mg) of the unknown (vanillin). Within 10 minutes, aldehydes will appear magenta. Compare the color of your unknown with the color of an aldehyde you know.

Reagent used - p-rosaniline hydrochloride (fuchsin) 0.1% aqueous solution: Prepare 50 mL. 2 mL of sodium bisulfite aqueous solution should be added. One mL of concentrated hydrochloric acid should be added after one hour.

Cinnamaldehyde

Structure

Its flavor and smell are attributed to cinnamaldehyde, an organic compound. It is found in the bark of cinnamon trees, and in other plants from the genus Cinnamomum. Cinnamaldehyde comprises 90 percent of cinnamon bark's essential oil. Typically, cinnamaldehyde occurs in concentrations ranging from nine to four thousand parts per million of chewing gum, ice cream, candy, and beverages. Some perfumes with sweet, fruity, or natural scents may also contain it. Fungicides are also made from cinnamaldehyde. The antimicrobial properties of cinnamaldehyde also make it useful.

Uses

Its ability to stimulate the metabolism is largely due to the presence of Cinnamaldehyde, which contributes to many of its health benefits. The herb Cinnamon is used to improve oral health by preventing tooth decay and bad breath. Infections can be reduced by Cinnamaldehyde's antifungal and antibacterial properties. Insufficient blood flow would otherwise result from cinnamaldehyde's ability to prevent blood platelet clotting. Cell membranes are able to produce anti-inflammatory responses by preventing the production of arachidonic acid.

Qualitative tests

Schiff's test for Cinnamaldehyde

To 1 mL of Schiff's reagent, add 1 drop (30 mg) of the unknown (Cinnamaldehyde). Within 10 minutes, aldehydes will appear magenta. Compare the color of your unknown with the color of an aldehyde you know.

Reagent used - p-rosaniline hydrochloride (fuchsin) 0.1% aqueous solution: Prepare 50 mL. 2 mL of sodium bisulfite aqueous solution should be added. One mL of concentrated hydrochloric acid should be added after one hour.
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Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of pharmaguideline.com, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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