Glutaraldehyde is an organic compound with the formula (CH2)3(CHO)2. The molecule consists of a five carbon chain doubly terminated with formyl (CHO) groups. It is usually used as a solution in water, and such solutions exists as a collection of hydrates, cyclic derivatives, and condensation products, several of which interconvert. Because the molecule has two aldehyde functional groups, glutaraldehyde (and its hydrates) can crosslink substances with primary amine groups, through condensation. Crosslinking can rigidify and deactivate proteins and other molecules that are critical for normal biological function, such as DNA, and so glutaraldehyde solutions are effective biocides and fixatives. It is sold under the brandnames Cidex and Glutaral.[3][4][5][6] As a disinfectant, it is used to sterilize surgical instruments.[3]
Uses
Biochemistry
Glutaraldehyde is used in biochemistry applications as an amine-reactive homobifunctional crosslinker and fixative.[7][8] It kills cells quickly by crosslinking their proteins. It is usually employed alone or mixed with formaldehyde[9] 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 organellemembrane lipids.
Another application for treatment of proteins with glutaraldehyde is the inactivation of bacterial toxins to generate toxoid vaccines, e.g., the pertussis (whooping cough) toxoid component in the Boostrix Tdap vaccine produced by GlaxoSmithKline.[10]
Material Science
In material science glutaraldehyde application areas range from polymers to metals and biomaterials. Glutaraldehyde is commonly used as fixing agent before characterization of biomaterials for microscopy. Glutaraldehyde is a powerful crosslinking agent for many polymers containing primary amine groups.[11][12] Glutaraldehdye also can be used for an interlinking agent to improve the adhesion force between two polymeric coatings.[13] Glutaraldehyde is also used to protect against corrosion of undersea pipes.[14]
As a medication it is used to treat plantar warts.[4] For this purpose, a 10% w/v solution is used. It dries the skin, facilitating physical removal of the wart.[16]
Glutaraldehyde is also used in the treatment of hyperhidrosis under the control of dermatologists. In people who have frequent sweating but do not respond to aluminum chloride. Glutaraldehyde solution is an effective agent to treat palmar and plantar hyperhidrosis as an alternative to tannic acid and formaldehyde.[17]
Other Uses
Aquaria
Glutaraldehyde diluted with water is often marketed as alternative to carbon dioxide gas injection for aquarium plants, but it lacks any characteristics that promote the growth of aquatic plants, and does not raise the CO2 concentration of water it is added to. Aquarists also commonly use it in low concentrations as an algicide.[18]
Safety
Side effects include skin irritation.[4] If exposed to large amounts, nausea, headache, and shortness of breath may occur.[3]Protective equipment is recommended when used, especially in high concentrations.[3] Glutaraldehyde is effective against a range of microorganisms including spores.[3][19] Glutaraldehyde is a dialdehyde.[20] It works by a number of mechanisms.[19]
As a strong sterilant, glutaraldehyde is toxic and a strong irritant.[21] There is no strong evidence of carcinogenic activity,[22] However, some occupations that work with this chemical have an increased risk of some cancers.[22]
Like other dialdehydes, (e.g., glyoxal) and simple aldehydes (e.g., formaldehyde), glutaraldehyde hydrates in aqueous solution, forming gem-diols. These diols in turn equilibrate with cyclic hemiacetal.[26][25][7] Monomeric glutaraldehyde polymerizes by aldol condensation and Michael reactions yielding alpha, beta-unsaturated poly-glutaraldehyde and related oligomers. This reaction occurs at alkaline pH values.[27]
A number of mechanisms have been invoked to explain the biocidal and fixative properties of glutaraldehyde.[19] Like many other aldehydes, it reacts with primary amines and thiol groups, which are common functional groups in proteins, nucleic acids and polymeric materials. Being bi-functional, glutaraldehyde is a crosslinker, which rigidifies macromolecular structures and shuts down their reactivity.[28]
The aldehyde groups in glutaraldehyde are susceptible to formation of imines by reaction with the amines of lysine and nucleic acids. The derivatives from aldol condensation of pairs of glutaraldehyde also undergo imine formation.[27]
^Vakili, Mohammadtaghi; Rafatullah, Mohd; Salamatinia, Babak; Abdullah, Ahmad Zuhairi; Ibrahim, Mahamad Hakimi; Tan, Kok Bing; Gholami, Zahra; Amouzgar, Parisa (2014). "Application of chitosan and its derivatives as adsorbents for dye removal from water and wastewater: A review". Carbohydrate Polymers. 113: 115–130. doi:10.1016/j.carbpol.2014.07.007. PMID25256466.
^Karnovsky, M.J. (1965). A formaldehyde-glutaraldehyde fixative of high osmolality for use in electron microscopy. Journal of Cell Biology 27: 137A–138A
^Erisen, Deniz. E (23 September 2022), "A novel chitosan and polydopamine interlinked bioactive coating for metallic biomaterials", Journal of Materials Science: Materials in Medicine, 33 (10), Springer-Nature: 65, doi:10.1007/s10856-022-06688-x, ISSN1573-4838, PMC9499904, PMID36138240
^Antiquis, Avus (20 September 2017). "Glutaraldehyde Revisited". praquatics.com - Aquarium Forums By Hobbyists For Hobbyists. Archived from the original on 14 February 2022. Retrieved 10 October 2022.