Diacetyl

Diacetyl (IUPAC systematic name: butanedione or butane-2,3-dione) is an organic compound with the chemical formula (CH3CO)2. It is a yellow or green liquid with an intensely buttery flavor. It is a vicinal diketone (two C=O groups, side-by-side) with the molecular formula C4H6O2. Diacetyl occurs naturally in alcoholic beverages and is added to some foods to impart its buttery flavor. Diacetyl is known to cause the lung disease bronchiolitis obliterans in those individuals exposed to it in an occupational setting.[2]

Diacetyl[1]
Names
Preferred IUPAC name
Butane-2,3-dione
Other names
Diacetyl
Biacetyl
Dimethyl diketone
2,3-Diketobutane
Identifiers
3D model (JSmol)
3DMet
605398
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.006.428
EC Number
  • 207-069-8
KEGG
RTECS number
  • EK2625000
UNII
UN number 2346
Properties
C4H6O2
Molar mass 86.090 g·mol−1
Appearance Yellowish green liquid
Density 0.990 g/mL at 15 °C
Melting point −2 to −4 °C (28 to 25 °F; 271 to 269 K)
Boiling point 88 °C (190 °F; 361 K)
200 g/L (20 °C)
Hazards
Main hazards Harmful, flammable
Safety data sheet External MSDS
GHS pictograms
GHS Signal word Danger
GHS hazard statements
 H225, H302, H315, H317, H318, H331, H373
P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P272, P280, P301+312, P302+352, P303+361+353, P304+340, P305+351+338, P310, P311, P314, P321, P330, P332+313, P333+313
NFPA 704 (fire diamond)
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Chemical structure

A distinctive feature of diacetyl (and other 1,2-diketones) is the long C–C bond linking the carbonyl centers. This bond distance is about 1.54 Å, compared to 1.45 Å for the corresponding C–C bond in 1,3-butadiene. The elongation is attributed to repulsion between the polarized carbonyl carbon centers.[3]

Occurrence

Diacetyl arises naturally as a byproduct of fermentation. In some fermentative bacteria, it is formed via the thiamine pyrophosphate-mediated condensation of pyruvate and acetyl CoA.[4] Sour (cultured) cream, cultured buttermilk, and cultured butter are produced by inoculating pasteurized cream or milk with a lactic starter culture, churning (agitating) and holding the milk until a desired pH drop (or increase in acidity) is attained. Cultured cream, cultured butter, and cultured buttermilk owe their tart flavour to lactic acid bacteria and their buttery aroma and taste to diacetyl.[5]

Production

Diacetyl is produced industrially by dehydrogenation of 2,3-butanediol. Acetoin is an intermediate.[6]

Applications

In food products

Diacetyl and acetoin are two compounds that give butter its characteristic taste. Because of this, manufacturers of artificial butter flavoring, margarines or similar oil-based products typically add diacetyl and acetoin (along with beta-carotene for the yellow color) to make the final product butter-flavored, because it would otherwise be relatively tasteless.[7]

Electronic cigarettes

Diacetyl is used as a flavoring agent in some liquids used in electronic cigarettes.[8] and people nearby may be exposed to it in the exhaled aerosol at levels near the limit set for occupational exposure.[9]

In alcoholic beverages

At low levels, diacetyl contributes a slipperiness to the feel of the alcoholic beverage in the mouth. As levels increase, it imparts a buttery or butterscotch flavor.

In some styles of beer (e.g. in many beer styles produced in the United Kingdom, such as stouts, English bitters, and Scottish ales), the presence of diacetyl can be acceptable or desirable at low or, in some cases, moderate levels. In other styles, its presence is considered a flaw or undesirable.[10]

Diacetyl is produced during fermentation as a byproduct of valine synthesis, when yeast produces α-acetolactate, which escapes the cell and is spontaneously decarboxylated into diacetyl. The yeast then absorbs the diacetyl, and reduces the ketone groups to form acetoin and 2,3-butanediol.

Beer sometimes undergoes a "diacetyl rest", in which its temperature is raised slightly for two or three days after fermentation is complete, to allow the yeast to absorb the diacetyl it produced earlier in the fermentation cycle. The makers of some wines, such as chardonnay, deliberately promote the production of diacetyl because of the feel and flavor it imparts.[11] Diacetyl is present in some chardonnays known as "butter bombs", although there is a trend back toward the more traditional French styles.[12]

Concentrations from 0.005 mg/L to 1.7 mg/L were measured in chardonnay wines, and the amount needed for the flavor to be noticed is at least 0.2 mg/L.[13][14]

Biochemical toxicity

Diacetyl has been shown to alter the amino acid arginine which could interfere with protein structure and function. Additionally diacetyl can bind to DNA and form guanosine adducts which can cause DNA uncoiling and cell death. In vitro studies on human cells also suggest that diacetyl alters the structure and function of the extracellular matrix and modifies epithelial cell responses to growth factors.[15] Human cells exposed to diacetyl also increase secretion of substance P which causes mucus hypersecretion, airway smooth muscle contraction, and edema.[16] Studies in rats have demonstrated significant airway epithelial damage and necrosis after exposure to diacetyl.[15]

Worker safety

The United States National Institute for Occupational Safety and Health has suggested diacetyl, when used in artificial butter flavoring (as used in many consumer foods), may be hazardous when heated and inhaled over a long period of time.[17] Workers in several factories that manufacture artificial butter flavoring have been diagnosed with bronchiolitis obliterans, a rare and serious disease of the lungs.[2] As with other end-stage lung diseases, transplantation is currently the most viable treatment option.[18] However, lung transplant rejection is very common and happens to be another setting in which bronchiolitis obliterans is known to occur.[19] The disease has been called "popcorn worker's lung" or "popcorn lung" because it was first seen in former workers of a microwave popcorn factory in Missouri,[20] but NIOSH refers to it by the more general term "flavorings-related lung disease".[20] It has also been called "flavorings-related bronchiolitis obliterans"[20] or diacetyl-induced bronchiolitis obliterans.[21] People who work with flavorings that include diacetyl are at risk for flavorings-related lung disease, including those who work in popcorn factories, restaurants, other snack food factories, bakeries, candy factories, margarine and cooking spread factories, and coffee processing facilities.[22]

In the year 2000 8 cases of bronchiolitis obliterans were detected in former employees of a microwave popcorn plant. Many of these individuals had initially been misdiagnosed as having other pulmonary diseases such as COPD and asthma. NIOSH investigated the worksite and suggested that artificial butter flavoring containing diacetyl was the most likely causative agent for the cases of bronchiolitis obliterans.[23] Follow up investigations at the plant revealed that 25% of employees had abnormal spirometry exams. The plant effectively implemented changes reducing air concentrations of diacetyl by 1 to 3 orders of magnitude in the years following. A stabilization of respiratory symptoms was seen after this point in those who had been exposed to high levels of diacetyl. However, declines in lung function as measured by spirometry continued.[24] Other studies also found cases of bronchiolitis obliterans in workers at 4 other microwave popcorn production facilities.[23] Additionally further studies have demonstrated a large increase in abnormal spirometry values in workers exposed to flavoring chemicals with a clear dose-response relationship.[25][26]

In 2006, the International Brotherhood of Teamsters and the United Food and Commercial Workers petitioned the U.S. OSHA to promulgate an emergency temporary standard to protect workers from the deleterious health effects of inhaling diacetyl vapors.[27] The petition was followed by a letter of support signed by more than 30 prominent scientists.[28] The matter is under consideration. On January 21, 2009, OSHA issued an advance notice of proposed rulemaking for regulating exposure to diacetyl.[29] The notice requests respondents to provide input regarding adverse health effects, methods to evaluate and monitor exposure, the training of workers. That notice also solicited input regarding exposure and health effects of acetoin, acetaldehyde, acetic acid and furfural.[30]

Two bills in the California Legislature seek to ban the use of diacetyl.[31][32][33]

A 2010 U.S. OSHA Safety and Health Information Bulletin and companion Worker Alert recommend employers use safety measures to avoid exposing employees to the potentially deadly effects of butter flavorings and other flavoring substances containing diacetyl or its substitutes.[34]

A preliminary in vitro study, published in 2012, suggests that diacetyl may exacerbate the effects of beta-amyloid aggregation, a process linked to Alzheimer's disease.[35]

Consumer safety

In 2007, the Flavor and Extract Manufacturers Association recommended reducing diacetyl in butter flavorings.[36] Manufacturers of butter flavored popcorn including Pop Weaver, Trail's End, and ConAgra Foods (maker of Orville Redenbacher's and Act II) began removing diacetyl as an ingredient from their products.[37][38]

In 2012, Wayne Watson, a regular microwavable popcorn consumer for years, was awarded US$7.27 million in damages from a federal jury in Denver, which decided his lung disease was caused by the chemicals in microwave popcorn and that the popcorn's manufacturer, Gilster-Mary Lee Corporation, and the grocery store that sold it should have warned him of its dangers.[39][40][41]

The European Commission has declared diacetyl is legal for use as a flavouring substance in all EU states.[42] As a diketone, diacetyl is included in the EU's flavouring classification Flavouring Group Evaluation 11 (FGE.11). A Scientific Panel of the EU Commission evaluated six flavouring substances (not including diacetyl) from FGE.11 in 2004.[43] As part of this study, the panel reviewed available studies on several other flavourings in FGE.11, including diacetyl. Based on the available data, the panel reiterated the finding that there were no safety concerns for diacetyl's use as a flavouring.

In 2007, the European Food Safety Authority (EFSA), the EU's food safety regulatory body, stated its scientific panel on food additives and flavourings (AFC) was evaluating diacetyl along with other flavourings as part of a larger study.[44]

In 2016, diacetyl was banned in eliquids / ecigarettes in the EU under the EU Tobacco Products Directive.[45]

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See also

References
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  2. Kreiss, Kathleen (August 2017). "Recognizing occupational effects of diacetyl: What can we learn from this history?". Toxicology. 388: 48–54. doi:10.1016/j.tox.2016.06.009. PMC 5323392. PMID 27326900.
  3. Eriks K, Hayden TD, Yang SH, Chan IY (1983). "Crystal and molecular structure of biacetyl (2,3-butanedione), (H3CCO)2, at −12 and −100 °C". J. Am. Chem. Soc. 105 (12): 3940–3942. doi:10.1021/ja00350a032.
  4. Speckman RA, Collins EB (January 1968). "Diacetyl biosynthesis in Streptococcus diacetilactis and Leuconostoc citrovorum". Journal of Bacteriology. 95 (1): 174–80. doi:10.1128/JB.95.1.174-180.1968. PMC 251989. PMID 5636815.
  5. Jay, James M (2000). Modern food microbiology. Gaithersburg, Md: Aspen Publishers. pp. 120. ISBN 978-0834216716. OCLC 42692251.
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  9. Committee on the Review of the Health Effects of Electronic Nicotine Delivery Systems, National Academies of Sciences (2018). "Chapter 3: E-Cigarette Devices, Uses, and Exposures". In Eaton DL, Kwan LY, Stratton K (eds.). Public Health Consequences of E-Cigarettes. National Academies Press. p. 82. ISBN 9780309468343. PMID 29894118.
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  21. Committee to Review the Respiratory Diseases Research Program, Board on Environmental Studies and Toxicology, Division on Earth and Life Studies, National Research Council and Institute of Medicine of the National Academies (2008). Respiratory diseases research at NIOSH : reviews of research programs of the National Institute for Occupational Safety and Health. Washington, D.C.: National Academies Press. p. 139. ISBN 9780309118736. Retrieved June 23, 2015.CS1 maint: multiple names: authors list (link)
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  33. "Bill Text - AB-514 Workplace safety and health". California Legislative Information.
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  37. Weaver Popcorn Company. Press Release: Pop Weaver introduces first microwave popcorn with flavoring containing no diacetyl Archived September 28, 2007, at the Wayback Machine
  38. ConAgra Foods Press Release ConAgra Foods press release announcing removal of added diacetyl
  39. ABC News: 'Popcorn Lung' Lawsuit Nets $7.2M Award
  40. NewsFeed Researcher: 'Popcorn Lung' Lawsuit Nets $7.2M Award
  41. Jaffe M (September 21, 2012). "Centennial man with "popcorn lung" disease gets $7.3 million award". The Denver Post. Archived from the original on September 21, 2012. Retrieved September 22, 2012.
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  43. "Opinion of the Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in contact with Food (AFC) on a request from the Commission" (PDF). The EFSA Journal. 166: 1–44. 2004.
  44. Europe takes 'wait-and-see' stance on diacetyl flavouring. Oct 2007
  45. "European Commission - PRESS RELEASES - Press release - 10 key changes for tobacco products sold in the EU".

Further reading
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