Dihydroxyacetone

Dihydroxyacetone

Names
Preferred IUPAC name 1,3-Dihydroxypropan-2-one
Other names 1,3-Dihydroxypropanone Dihydroxyacetone DHA Glycerone
Identifiers
CAS Number	96-26-4  Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:16016  Y
ChEMBL	ChEMBL1229937  N
ChemSpider	650  Y
DrugBank	DB01775  Y
ECHA InfoCard	100.002.268
EC Number	202-494-5
KEGG	D07841  Y
PubChem CID	670
UNII	O10DDW6JOO  Y
CompTox Dashboard (EPA)	DTXSID0025072
InChI InChI=1S/C3H6O3/c4-1-3(6)2-5/h4-5H,1-2H2 Y Key: RXKJFZQQPQGTFL-UHFFFAOYSA-N Y InChI=1/C3H6O3/c4-1-3(6)2-5/h4-5H,1-2H2 Key: RXKJFZQQPQGTFL-UHFFFAOYAE
SMILES O=C(CO)CO
Properties [1]
Chemical formula	C3H6O3
Molar mass	90.078 g·mol−1
Melting point	89 to 91 °C (192 to 196 °F; 362 to 364 K)
Hazards [2]
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H319
Precautionary statements	P264, P280, P305+P351+P338, P337+P313
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N  verify  (what is  YN ?) Infobox references

Dihydroxyacetone ( /ˌdaɪhaɪˌdrɒksiˈæsɪtoʊn/ ^ⓘ ; DHA), also known as glycerone, is a simple saccharide (a triose) with formula C
_³H
_⁶O
_³.

DHA is primarily used as an ingredient in sunless tanning products. It is often derived from plant sources such as sugar beets and sugar cane, and by the fermentation of glycerin.

Chemistry

DHA is a hygroscopic white crystalline powder. It has a sweet cooling taste and a characteristic odor. It is the simplest of all ketoses and has no chiral center. The normal form is a dimer (2,5-bis(hydroxymethyl)-1,4-dioxane-2,5-diol). The dimer slowly dissolves in water, ^[3] whereupon it converts to the monomer. These solutions are stable at pH's between 4 and 6. In more basic solution, it degrades to brown product. ^[4]

This skin browning effect is attributed to a Maillard reaction. DHA condenses with the amino acid residues in the protein keratin, the major component of the skin surface. When injected, no pigmentation occurs, consistent with a role for oxygen in color development. ^[4] The resulting pigments, which can be removed by abrasion, are called melanoidins. These are similar in coloration to melanin, the natural substance in the deeper skin layers which brown or "tan" from exposure to UV rays. ^[5]

Biochemistry

Its phosphorylated form, dihydroxyacetone phosphate (DHAP), takes part in glycolysis, and it is an intermediate product of fructose metabolism.

Preparation

DHA may be prepared, along with glyceraldehyde, by the mild oxidation of glycerol, for example with hydrogen peroxide and a ferrous salt as catalyst. It can also be prepared in high yield and selectivity at room temperature from glycerol using cationic palladium-based catalysts with oxygen, air or benzoquinone acting as co-oxidants. ^{[6] [7] [8]} Glyceraldehyde is a structural isomer of dihydroxyacetone.

DHA can be derived from plants. ^[5]

Sunless tanning

Main article: Sunless tanning

DHA is the main active ingredient in many sunless tanning skincare preparations, which may be classified as topical sunless tanner or temporary bronzers. As opposed to bronzers containing pigment to coat the skin, DHA bronzers cause a coloration of the surface layer of the skin and do not wash off easily. Current sunless tanners are formulated into sprays, lotions, gels, mousses, and cosmetic wipes. ^[5] Professional applied products include spray tanning booths, airbrush tan applications, and hand applied lotions, gels, mousses and wipes. Lotions often last longer than sprays but may cause blotching and streaking. Mousses and gels tend to dry faster. Mousses generally contain less moisture. ^[5]

Lotion manufacturers also produce a wide variety of sunless tanning preparations that replace DHA with natural bronzing agents such as black walnut shell. DHA may be used alone or combined with other tanning components such as erythrulose. DHA is considered the most effective sun-free tanning additive.^{[ citation needed ]}

Sunless tanning products contain DHA in concentrations ranging from 1% to 20%. Most drugstore products range from 3% to 5%, with professional products ranging from 5% to 20%. The percentages correspond with the product coloration levels from light to dark. Lighter products are more beginner-friendly, but may require multiple coats to produce the desired color depth. Darker products produce a dark tan in one coat, but are also more prone to streaking, unevenness, or off-color tones. The artificial tan takes 2 to 4 hours to begin appearing on the skin surface, and will continue to darken for 24 to 72 hours, depending on formulation type. ^[5]

Once the darkening effect has occurred, the tan will not sweat off or wash away with soap or water. It will fade gradually over 3 to 7 days as a result of the regular skin exfoliation. Scrubbing the skin, prolonged water submersion, or heavy sweating can lighten the tan, as these all contribute to rapid dead skin cell exfoliation (the dead skin cells are the tinted portion of the sunless tan). ^[5]

It is recommended to shave, wash, or exfoliate the skin before application in order to produce a more even tan. The skin should not be moisturized before application except very dry areas. Application should be done evenly with a circular motion. ^[5]

Bronzers contain DHA in concentrations from 1 to 15% allowing to adjust the intensity of coloration. DHA formulations have improved in several ways since the introduction in the 1960s. ^[5]

Safe use and side effects

The United States Food and Drug Administration (FDA) has approved DHA for topical application on the skin, but not for contact with eyes, lips, and mucous membranes. DHA may not be used in spray tanning booths due to risk of exposure of these sensitive areas. ^[5]

DHA-containing spray tans have been associated to side effects such as rashes, cough, dizziness, and fainting. Frequent exposure to spray tans may increase the risk of pulmonary disease, asthma, chronic obstructive pulmonary disease (COPD), and cancer. ^[5]

The chemical reaction of DHA in the skin may lead to an unpleasent smell. Often fragrances are added to the formulation to mask the smell. Fragrances may lead to allergic reactions or worsen asthma symptoms. Some products contain parabens as chemical preservatives that can cause rosacea and allergic contact dermatitis and act as weak estrogens. ^[5]

Frequent use of DHA containing products may to be problematic due to a number of side effects. A FDA report concluded that 11 percent of the applied DHA may penetrate into the living cells of the epidermis and dermis. A previous study linked DHA to DNA damage, cell-cycle block, and apoptosis in living cells. Skin coloring induced by frequent use of DHA may interfere with vitamin D production in the skin cells which depends on the exposure to UVB in sunlight. Topical DHA use in levels of more than 5% seem to increase free-radical damage from sunlight for 24 hours after application. Antioxidants may be added to the formulation to produce a more natural tan, and may potentially counteract free radical damage. The use of sunless tanning products may increase the likelihood of sunburn as the artificial coloration of the skin interferes with the natural adaption of the skin to sun exposure. The tanning induced by DHA has been rated with a low sun protection factor (SPF) of 3. It can therefore not replace the application of a regular suncreen before exposing the skin to intensive sunlight. ^[5]

Erythrulose is a similar agent contained in red raspberries that produces a short-lived reddish tan. The general tanning effect is usually improved when used in combination with DHA. Erythrulose also increases the occurrence of free radicals. ^[5]

DHA may be contained in moisturizers with added fruit extracts sold as "maximizers". Tanning agents labelled as "tingles" contain benzyl nicotinate which presumably aids the production of melanin by increasing blood circulation in the skin, thus supplying more oxygen to melanocytes, and often induces a burning or tingling feeling. The effect of products called "optimizers" or "accelerators" containing the protein tyrosine as a precursor in the production of melanin is disputed. ^[5]

History

DHA was first recognized as a skin coloring agent by German scientists in the 1920s. Through its use in the X-ray process, it was noted as causing the skin surface to turn brown when spilled.

In the 1950s, Eva Wittgenstein at the University of Cincinnati did further research with dihydroxyacetone. ^{[9] [10] [11] [12]} Her studies involved using DHA as an oral drug for assisting children with glycogen storage disease. The children received large doses of DHA by mouth, and sometimes spat or spilled the substance onto their skin. Healthcare workers noticed that the skin turned brown after a few hours of DHA exposure. Wittgenstein continued to experiment with DHA, painting liquid solutions of it onto her own skin. She was able to consistently reproduce the pigmentation effect, and noted that DHA did not appear to penetrate beyond the stratum corneum, or dead skin surface layer (the FDA eventually concluded this is not entirely true ^[13] ). Research then continued on DHA's skin coloring effect in relation to treatment for patients with vitiligo.

Coppertone introduced the first consumer sunless tanning lotion into the marketplace in the 1960s. This product was called "Quick Tan" or "QT". It was sold as an overnight tanning agent, and other companies followed suit with similar products. Consumers soon tired of this product due to unattractive results such as orange palms, streaking and poor coloration. Because of the QT experience, many people still associate sunless tanning with fake-looking orange tans.^{[ citation needed ]}

In the 1970s the United States Food and Drug Administration (FDA) added DHA permanently to their list of approved cosmetic ingredients. ^[14]

By the 1980s, new sunless tanning formulations appeared on the market and refinements in the DHA manufacturing process created products that produced a more natural looking color and better fading. Consumer concerns surrounding damage associated with UV tanning options (sunbathing, indoor tanning) spurred popularity of sunless tanning products as an alternative to UV tanning. Dozens of brands appeared on drugstore shelves, in numerous formulations.^{[ citation needed ]}

Winemaking

Both acetic acid bacteria Acetobacter aceti and Gluconobacter oxydans use glycerol as a carbon source to form dihydroxyacetone. DHA is formed by ketogenesis of glycerol. ^[15] It can affect the sensory quality of the wine with sweet/etherish properties. DHA can also react with proline to produce a "crust-like" aroma. ^{[15] [16] [17]} Dihydroxyacetone can affect the anti-microbial activity in wine, as it has the ability to bind SO₂. ^[18]

References

1. Weast, Robert C., ed. (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, FL: CRC Press. p. C-74. ISBN   0-8493-0462-8..
2. HSNO Chemical Classification Information Database, New Zealand Environmental Risk Management Authority, retrieved 3 September 2009
3. Budavari, Susan, ed. (1996), The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (12th ed.), Merck, ISBN   0911910123 ,3225
4. Levy, Stanley B. (1992). "Dihydroxyacetone-containing sunless or self-tanning lotions". Journal of the American Academy of Dermatology. 27 (6): 989–993. doi:10.1016/0190-9622(92)70300-5. PMID   1479107.
5. Garone M, Howard J, Fabrikant J. A review of common tanning methods. J Clin Aesthet Dermatol. 2015 Feb;8(2):43-7. PMID: 25741402; PMCID: PMC4345932.
6. Painter, Ron M.; Pearson, David M.; Waymouth, Robert M. (2010). "Selective Catalytic Oxidation of Glycerol to Dihydroxyacetone". Angewandte Chemie International Edition. 49 (49): 9456–9. doi:10.1002/anie.201004063. PMID   21031380.
7. Chung, Kevin; Banik, Steven M.; De Crisci, Antonio G.; Pearson, David M.; Blake, Timothy R.; Olsson, Johan V.; Ingram, Andrew J.; Zare, Richard N.; Waymouth, Robert M. (2013). "Chemoselective Pd-Catalyzed Oxidation of Polyols: Synthetic Scope and Mechanistic Studies". Journal of the American Chemical Society. 135 (20): 7593–602. doi:10.1021/ja4008694. PMID   23659308.
8. De Crisci, Antonio G.; Chung, Kevin; Oliver, Allen G.; Solis-Ibarra, Diego; Waymouth, Robert M. (2013). "Chemoselective Oxidation of Polyols with Chiral Palladium Catalysts". Organometallics. 32 (7): 2257–66. doi:10.1021/om4001549.
9. "What's that stuff?". Chemical & Engineering News. 78 (24): 46. 12 June 2000. doi:10.1021/cen-v078n024.p046.
10. Wittgenstein, Eva; Guest, G M (1961). "Biochemical Effects of Dihydroxyacetone". The Journal of Investigative Dermatology. 37 (5): 421–6. doi: 10.1038/jid.1961.137 . PMID   14007781.
11. Blank, Harvey (1961). "Introduction of Dr. René J. Dubos as the First Herman Beerman Lecturer". The Journal of Investigative Dermatology. 37 (4): 233–234. doi: 10.1038/jid.1961.38 . PMID   13706567.
12. Wittgenstein, E.; Berry, H. K. (1960). "Staining of Skin with Dihydroxyacetone". Science. 132 (3431): 894–5. Bibcode:1960Sci...132..894W. doi:10.1126/science.132.3431.894. PMID   13845496. S2CID   7946691.
13. "Are 'Spray-On' Tans Safe? Experts Raise Questions as Industry Puts Out Warnings". ABC News .
14. 21 CFR 73.1150
15. Drysdale, G.S.; Fleet, G.H. (1988). "Acetic acid bacteria in winemaking: a review". American Journal of Enology and Viticulture. 39 (2): 143–154.
16. Margalith, Pinhas (1981). Flavor microbiology . Thomas. ISBN   978-0-398-04083-3.^{[ page needed ]}
17. Boulton, Roger B.; Singleton, Vernon L.; Bisson, Linda F.; Kunkee, Ralph E. (1999). Principles and Practices of Winemaking. Springer. ISBN   978-0-8342-1270-1.^{[ page needed ]}
18. Eschenbruch, B.; Dittricha, H. H. (1986). "Stoffbildungen von Essigbakterien in bezug auf ihre Bedeutung für die Weinqualität" [Metabolism of acetic acid bacteria in relation to their importance to wine quality]. Zentralblatt für Mikrobiologie. 141 (4): 279–89. doi:10.1016/S0232-4393(86)80045-2.

External links

• How Stuff Works
• US FDA/CFSAN - Tanning Pills
• American Academy of Dermatology on Self Tanners
• DHA and Vitiligo
• Fesq, H.; Brockow, K.; Strom, K.; Mempel, M.; Ring, J.; Abeck, D. (2001). "Dihydroxyacetone in a New Formulation – A Powerful Therapeutic Option in Vitiligo". Dermatology. 203 (3): 241–3. doi:10.1159/000051757. PMID   11701979. S2CID   26802465.
• Draelos, Zoe D. (2002). "Self-Tanning Lotions: Are They a Healthy Way to Achieve a Tan?". American Journal of Clinical Dermatology. 3 (5): 317–8. doi:10.2165/00128071-200203050-00003. PMID   12069637. S2CID   53819152.
• New Zealand Dermatological Society recommends sunless tanners