Propylene glycol: Difference between revisions

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[[File:Propylene-glycol-3D-balls.png|thumb|250px|A 3D model of propylene glycol|thumb]]
{{Short description|Overview of the uses and properties of propylene glycol}}
{{Infobox chemical
| name = Propylene glycol
| image = Propylene glycol chemical structure.png
| image_size = 200px
| image_caption = Chemical structure of propylene glycol
| IUPACName = Propane-1,2-diol
| othernames = 1,2-Propylene glycol, 1,2-Dihydroxypropane, Methyl glycol
| section1 = {{Chembox Identifiers
  | CASNo = 57-55-6
  | PubChem = 1030
  | ChemSpiderID = 1000
  }}
}}


== Introduction ==
'''Propylene glycol''' is a synthetic organic compound with the chemical formula C₃H₈O₂. It is a viscous, colorless liquid, which is nearly odorless but possesses a faintly sweet taste. Chemically, it is classified as a diol, and it is miscible with a broad range of solvents, including water, acetone, and chloroform.


==Chemical Properties==
[[File:1,2-Propandiol Synthesis V1.svg|thumb|Synthesis of 1,2-propanediol]]
Propylene glycol is produced on a large scale primarily from [[propylene oxide]]. It is a chiral molecule, and commercial production typically yields a racemic mixture of the two enantiomers. The compound is stable under normal conditions and does not react with most chemicals.


[[File:Propylene glycol stereoisomers v.1.png|Propylene_glycol_stereoisomers_v.1|thumb]]
==Uses==
Propylene glycol is widely used in various industries due to its versatile properties:


Propylene glycol (PG) is a colorless, odorless, and slightly sweet organic compound that is commonly used as a solvent, humectant, and preservative in a variety of industries. It is a synthetic compound that is derived from petroleum and is commonly used in food, pharmaceutical, and cosmetic products.
===Pharmaceutical and Food Industry===
In the pharmaceutical industry, propylene glycol is used as a solvent for oral, injectable, and topical drugs. It is also used as a carrier in [[e-liquid]]s for [[vaping]]. In the food industry, it serves as a humectant, solvent, and preservative in food products and is recognized as safe by the [[Food and Drug Administration]] (FDA).


== History ==
===Cosmetics and Personal Care===
Propylene glycol was first discovered in the 1850s by a French chemist named Charles Moureu. It was initially used as a solvent for printing inks and later as a coolant for refrigeration systems. In the 1930s, it began to be used in the food industry as a humectant and solvent.
Propylene glycol is a common ingredient in [[cosmetics]] and personal care products, where it functions as a moisturizer, solvent, and carrier for fragrances. It helps to maintain moisture in products and enhances their texture and spreadability.


== Chemical Properties ==
===Industrial Applications===
Propylene glycol is a diol, which means it has two hydroxyl (OH) groups. It has a chemical formula of C3H8O2 and a molecular weight of 76.09 g/mol. It is a viscous, colorless liquid that is soluble in water and most organic solvents.
[[File:Deicing a 737 (8407234815).jpg|thumb|Propylene glycol used in aircraft deicing]]
In industrial settings, propylene glycol is used as an antifreeze and coolant in systems where leakage might lead to contact with food or potable water. It is also used in the manufacture of [[polyester]] resins and as a de-icing fluid for aircraft.


== Uses ==
==Safety and Environmental Impact==
Propylene glycol has a wide range of uses in various industries. In the food industry, it is used as a humectant and preservative in products such as baked goods, soft drinks, and ice cream. In the pharmaceutical industry, it is used as a solvent for drugs and as a vehicle for oral and topical medications. In the cosmetics industry, it is used as a moisturizer and emulsifier in products such as lotions, creams, and makeup.
Propylene glycol is generally considered safe for use in food and pharmaceuticals. It is metabolized in the human body to lactic acid, which is a normal component of the metabolic process. However, excessive exposure can lead to adverse effects, such as skin irritation or allergic reactions in sensitive individuals.


== Health and Safety ==
Environmentally, propylene glycol is biodegradable and poses minimal risk to aquatic life when used in appropriate concentrations.
Propylene glycol is generally considered safe for human consumption and use in cosmetics. It is classified by the U.S. Food and Drug Administration (FDA) as a GRAS (generally recognized as safe) substance. However, some individuals may be sensitive to propylene glycol and may experience allergic reactions or skin irritation. Ingesting large quantities of propylene glycol can also cause gastrointestinal distress.


== Environmental Impact ==
==Also see==
Propylene glycol is a synthetic compound that is derived from petroleum, and its production can have negative environmental impacts. It is also not readily biodegradable, which means it can persist in the environment for a long time. However, propylene glycol has a lower environmental impact compared to other synthetic compounds and is generally considered to be a low-toxicity substance.
* [[Ethylene glycol]]
* [[Glycerol]]
* [[Polyethylene glycol]]
* [[Antifreeze]]
* [[Solvent]]


== Alternatives ==
{{Chemistry-stub}}
While propylene glycol is a commonly used compound, there are alternatives that can be used in its place. Vegetable glycerin, for example, is a natural compound that is often used as a substitute for propylene glycol in food, cosmetics, and pharmaceuticals. It is derived from vegetable oil and is generally considered to be safe for human consumption and use. Another alternative is polyethylene glycol (PEG), which is also commonly used as a solvent and vehicle for medications.
{{Pharmacology-stub}}
 
== Regulations ==
Propylene glycol is regulated by various organizations and agencies around the world. In the United States, it is regulated by the FDA, which sets limits on its use in food, drugs, and cosmetics. The European Union has also set limits on the use of propylene glycol in food and cosmetics. Additionally, the World Health Organization (WHO) has established guidelines for the use of propylene glycol in pharmaceuticals.
 
== Conclusion ==
Propylene glycol is a widely used compound that has a variety of applications in various industries. While it is generally considered safe for human consumption and use, it is important to be aware of potential allergic reactions or sensitivity. As with any synthetic compound, it is also important to consider its environmental impact and explore alternatives where possible.
 
== References ==
<references />


[[Category:Organic compounds]]
[[Category:Organic compounds]]
[[Category:Diols]]
[[Category:Food additives]]
[[Category:Food additives]]
[[Category:Cosmetics]]
[[Category:Pharmaceuticals]]
[[Category:Petroleum products]]
[[Category:Chemical compounds]]
[[Category:Solvents]]
[[Category:Solvents]]
[[Category:Humectants]]
[[Category:Preservatives]]
{{stub}}

Latest revision as of 02:44, 11 December 2024

Overview of the uses and properties of propylene glycol


Propylene glycol
Propylene glycol chemical structure.png
Chemical structure of propylene glycol
Identifiers
CAS Number
PubChem CID
ChemSpider ID
UNII
ChEBI
ChEMBL
Properties
Chemical Formula
Molar Mass
Appearance
Density
Melting Point
Boiling Point
Hazards
GHS Pictograms [[File:|50px]]
GHS Signal Word
GHS Hazard Statements
NFPA 704 [[File:|50px]]
References

Propylene glycol is a synthetic organic compound with the chemical formula C₃H₈O₂. It is a viscous, colorless liquid, which is nearly odorless but possesses a faintly sweet taste. Chemically, it is classified as a diol, and it is miscible with a broad range of solvents, including water, acetone, and chloroform.

Chemical Properties[edit]

Synthesis of 1,2-propanediol

Propylene glycol is produced on a large scale primarily from propylene oxide. It is a chiral molecule, and commercial production typically yields a racemic mixture of the two enantiomers. The compound is stable under normal conditions and does not react with most chemicals.

Uses[edit]

Propylene glycol is widely used in various industries due to its versatile properties:

Pharmaceutical and Food Industry[edit]

In the pharmaceutical industry, propylene glycol is used as a solvent for oral, injectable, and topical drugs. It is also used as a carrier in e-liquids for vaping. In the food industry, it serves as a humectant, solvent, and preservative in food products and is recognized as safe by the Food and Drug Administration (FDA).

Cosmetics and Personal Care[edit]

Propylene glycol is a common ingredient in cosmetics and personal care products, where it functions as a moisturizer, solvent, and carrier for fragrances. It helps to maintain moisture in products and enhances their texture and spreadability.

Industrial Applications[edit]

Propylene glycol used in aircraft deicing

In industrial settings, propylene glycol is used as an antifreeze and coolant in systems where leakage might lead to contact with food or potable water. It is also used in the manufacture of polyester resins and as a de-icing fluid for aircraft.

Safety and Environmental Impact[edit]

Propylene glycol is generally considered safe for use in food and pharmaceuticals. It is metabolized in the human body to lactic acid, which is a normal component of the metabolic process. However, excessive exposure can lead to adverse effects, such as skin irritation or allergic reactions in sensitive individuals.

Environmentally, propylene glycol is biodegradable and poses minimal risk to aquatic life when used in appropriate concentrations.

Also see[edit]

This article is a stub related to chemistry. You can help WikiMD by expanding it!


This article is a stub related to pharmacology. You can help WikiMD by expanding it!
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