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Phosphodiester Linkages

Phosphodiester Linkages

Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...

Types of Step-Growth Polymers: Polyesters

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

Phosphate Buffer

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

Roles of Electrolytes: Calcium and Phosphate

Roles of Electrolytes: Calcium and Phosphate

Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
The calcium concentration in blood plasma is primarily regulated...

Overview of Fatty Acid Metabolism

Overview of Fatty Acid Metabolism

Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.

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Updated: Jun 22, 2026

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

Phosphate diesters for dermatological use.

E Carreras¹, M Carreras, J Muñoz

¹Research Department, Laboratories E. Carreras, Petxina 7, Barcelona, Spain.

International Journal of Cosmetic Science

|May 27, 2009

Summary

A novel phosphate diester and cocoimidazoline derivative formulation offers superior foaming and defatting properties for dermatological and hair care products. This safe, non-irritant mixture is ideal for cleansing applications.

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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

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Last Updated: Jun 22, 2026

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

Area of Science:

Cosmetic Science
Dermatology
Formulation Chemistry

Background:

Development of effective and safe cleansing agents is crucial for dermatological and hair care applications.
Existing commercial formulations vary in efficacy and safety profiles.

Purpose of the Study:

To evaluate a new formulation containing phosphate diesters of the nonyl-phenol type and cocoimidazoline derivatives.
To compare its performance against four commercial formulations for dermatological and hair care use.

Main Methods:

Assessed foaming capacity, eye and skin irritation potential, keratin solubilization, and defatting properties.
Compared the novel mixture against established commercial products.

Main Results:

The novel mixture demonstrated the best foam-forming capability and superior defatting action.
The formulation proved to be non-irritant to skin and eyes at appropriate dilutions.
It did not exhibit keratin-dissolving properties, indicating mildness.

Conclusions:

The studied formulation exhibits excellent detergent properties, making it suitable for dermatological and hair care.
Its favorable safety profile and performance rank it highly among safe cleansing products.