Glutaraldehyde

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Glutaraldehyde
Skeletal formula of glutaraldehyde
Ball-and-stick model of the glutaraldehyde molecule
Names
Preferred IUPAC name
Pentanedial[1]
Other names
Glutaraldehyde
Glutardialdehyde
Glutaric acid dialdehyde
Glutaric aldehyde
Glutaric dialdehyde
1,5-Pentanedial
Identifiers
111-30-8 YesY
ChemSpider 3365 YesY
DrugBank DB03266 YesY
Jmol 3D model Interactive image
KEGG D01120 YesY
PubChem 3485
UNII T3C89M417N YesY
Properties
C5H8O2
Molar mass 100.117
Appearance Clear liquid
Odor pungent[2]
Density 1.06 g/mL
Melting point −14 °C (7 °F; 259 K)
Boiling point 187 °C (369 °F; 460 K)
Miscible, reacts
Vapor pressure 17 mmHg (20°C)[2]
Hazards
Flash point noncombustible[2]
US health exposure limits (NIOSH):
PEL (Permissible)
none[2]
REL (Recommended)
C 0.2 ppm (0.8 mg/m3)[2]
IDLH (Immediate danger)
N.D.[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

Glutaraldehyde is an organic compound with the formula CH2(CH2CHO)2. A pungent colorless oily liquid, glutaraldehyde is used as a sterilisation agent and preservative. It is mainly available as an aqueous solution, and in these solutions the aldehyde groups are hydrated.[3]

Uses[edit]

Sterilisation and biocidal action[edit]

Virtually all applications of glutaraldehyde exploit its high reactivity toward proteins. Being nonvolatile and bifunctional, glutaraldehyde is often preferred to the less expensive formaldehyde. It reacts with amines, amides, and thiol groups in proteins.[4]

A glutaraldehyde solution of 0.1% to 1.0% concentration may be used as a biocide for system disinfection and as a preservative for long term storage. It is a sterilant, killing endospores in addition to many microorganisms and viruses.[5]

Glutaraldehyde is a component of hydraulic fracturing "fracking" fluid. It is included in the additive called Alpha 1427, as a biocide.[6] Bacterial growth can impair the production of oil and gas wells, and can be introduced into the formation from various sources including the source water, proppant, and polymer used in the hydraulic fracturing process. Glutaraldehyde is pumped as a liquid additive with the fracturing fluid to reduce or eliminate this source of formation and fracture conductivity damage.

Fixative[edit]

Glutaraldehyde is used in biochemistry applications as an amine-reactive homobifunctional crosslinker and fixative prior to SDS-PAGE, staining, or electron microscopy. It kills cells quickly by crosslinking their proteins and is usually employed alone or mixed with formaldehyde[7] as the first of two fixative processes to stabilize specimens such as bacteria, plant material, and human cells. A second fixative procedure uses osmium tetroxide to crosslink and stabilize cell and organelle membrane lipids. Fixation is usually followed by dehydration of the tissue in ethanol or acetone, followed by embedding in an epoxy resin or acrylic resin.

Another application for treatment of proteins with glutaraldehyde is the inactivation of bacterial toxins to create toxoid vaccines, e.g., the pertussis (whooping cough) toxoid component in the Boostrix Tdap vaccine produced by GlaxoSmithKline.[8]

In a related application, glutaraldehyde is sometimes employed in the tanning of leather and in embalming.

Wart treatment[edit]

A solution of glutaraldehyde, typically of 10% w/w, is sold under various trade names to remove common and plantar warts. It is said to inactivate viruses and bacteria, and to dry the skin, facilitating physical removal of the wart.[9] Trade names include Diswart Solution and Glutarol.

Safety[edit]

As a strong sterilant, glutaraldehyde is toxic and a strong irritant.[10] There is no evidence of carcinogenic activity.[11]

Production and structure[edit]

Glutaraldehyde synthesis.svg

Glutaraldehyde is produced industrially by the oxidation of cyclopentene and by the Diels-Alder reaction of acrolein and methyl vinyl ether followed by hydrolysis.[3]

Like other dialdehydes (e.g., glyoxal), it does not exist as the dialdehyde in water, but as the hydrate. These hydrates adopt several equilibrating species.[12]

GlutaldehydeHydrateEquilibria.png

Monomeric glutaraldehyde can polymerize by aldol condensation reaction yielding alpha, beta-unsaturated poly-glutaraldehyde. This reaction usually occurs at alkaline pH values.

References[edit]

  1. ^ Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 907. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4. 
  2. ^ a b c d e f "NIOSH Pocket Guide to Chemical Hazards #0301". National Institute for Occupational Safety and Health (NIOSH). 
  3. ^ a b Christian Kohlpaintner, Markus Schulte, Jürgen Falbe, Peter Lappe, Jürgen Weber (2005), "Aldehydes, Aliphatic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a01_321.pub2 
  4. ^ H. Uhr, B. Mielke, O. Exner, K. R. Payne, E. Hill (2005), "Biocides", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a16_563.pub2 
  5. ^ HCC lecture notes, 15: Control of microrganisms
  6. ^ Morgantown Utility Board. "Fracking Fluid Additives - Fracking Fluid MSDS's". . Links to documents, including Alpha 1427 Material Safety Data Sheet
  7. ^ Karnovsky, M.J. (1965). A formaldehyde-glutaraldehyde fixative of high osmolality for use in electron microscopy. Journal of Cell Biology 27: 137A–138A
  8. ^ Boostrix prescribing information, ©2009, GlaxoSmithKline
  9. ^ NHS Choices: Glutarol
  10. ^ Canadian Centre for Occupational Health and Safety (CCOHS) (a federal government site) > OSH Answers > Diseases, Disorders & Injuries > Asthma Document last updated on February 8, 2005
  11. ^ Toxicology and Carcinogenesis Studies of Glutaraldehyde
  12. ^ Whipple Earl B.; Ruta Michael (1974). "Structure of Aqueous Glutaraldehyde". J. Org. Chem. 39: 1666–1668. doi:10.1021/jo00925a015. 

External links[edit]