From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Skeletal formula of daminozide
Preferred IUPAC name
4-(2,2-Dimethylhydrazin-1-yl)-4-oxobutanoic acid
Other names
N-(Dimethylamino)succinamic acid; Butanedioic acid mono (2,2-dimethyl hydrazine); Succinic acid 2,2-dimethyl hydrazide
3D model (JSmol)
ECHA InfoCard 100.014.988 Edit this at Wikidata
EC Number
  • 216-485-9
MeSH daminozide
RTECS number
  • WM9625000
  • InChI=1S/C6H12N2O3/c1-8(2)7-5(9)3-4-6(10)11/h3-4H2,1-2H3,(H,7,9)(H,10,11) checkY
  • CN(C)NC(=O)CCC(O)=O
Molar mass 160.173 g·mol−1
Appearance White crystals
Melting point 159.24 °C; 318.63 °F; 432.39 K
Lethal dose or concentration (LD, LC):
  • >1,600 mg kg−1 (dermal, rabbit)
  • 8,400 mg kg−1 (oral, rat)
Related compounds
Related alkanoic acids
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Daminozide – also known as Alar, Kylar, B-NINE, DMASA, SADH, or B 995 – is a plant growth regulator, a chemical sprayed on fruit to regulate growth, make harvest easier, and keep apples from falling off the trees before they ripen so they are red and firm for storage. Alar was first approved for use in the U.S. in 1963. It was primarily used on apples until 1989, when the manufacturer voluntarily withdrew it after the U.S. Environmental Protection Agency proposed banning it based on concerns about cancer risks to consumers.[2]

It was produced in the U.S. by the Uniroyal Chemical Company, Inc, (now integrated into the Chemtura Corporation), which registered daminozide for use on fruits intended for human consumption in 1963. In addition to apples and ornamental plants, they also registered for use on cherries, peaches, pears, Concord grapes, tomato transplants, and peanut vines. On fruit trees, daminozide affects flow-bud initiation, fruit-set maturity, fruit firmness and coloring, preharvest drop and market quality of fruit at harvest and during storage.[2] In 1989, the EPA made it illegal to use daminozide on U.S. food crops, but still allow for non-food crops like ornamental plants.[3]

The campaign to ban Alar[edit]

In 1985, the EPA studied Alar's effects on mice and hamsters, and proposed banning its use on food crops. They submitted the proposal to the Scientific Advisory Panel (SAP), which concluded that the tests were inadequate to determine how carcinogenic the tested substances were. Later they discovered that at least one of the SAP members had a financial connection to Uniroyal, and others had financial ties to the chemical industry.[4]

The next year, the EPA retracted its proposed ban and required farmers to reduce Alar use by 50%. The American Academy of Pediatrics urged EPA to ban daminozide, and some manufacturers and supermarket chains announced they would not accept Alar-treated apples.[4]

In a 1989 report, the Natural Resources Defense Council (NRDC) reported that on the basis of a two-year peer reviewed study, children were at "intolerable risk" from a wide variety of potentially lethal chemicals, including daminozide, that they ingest in legally permissible quantity. By their estimate, "The average pre-schooler's exposure was estimated to result in a cancer risk 240 times greater than the cancer risk considered acceptable by E.P.A. following a full lifetime of exposure."[5]

In February, 1989, the CBS television program 60 Minutes broadcast a story about Alar that featured a report by the Natural Resources Defense Council highlighting problems with the chemical.

In 1989, following the CBS broadcast, the United States Environmental Protection Agency (EPA) decided to ban Alar on the grounds that "long-term exposure" posed "unacceptable risks to public health." However, in June 1989—before the EPA's preliminary decision to ban all food uses of Alar went into effect—Uniroyal, Alar's sole manufacturer, agreed to halt voluntarily all domestic sales of Alar for food uses.[6][7][8]


In November 1990, Washington apple growers filed a lawsuit in Yakima County Superior Court against CBS, NRDC and Fenton Communications (hired by NRDC to publicize their report on Alar)[9] claiming that unfair business practices (product disparagement in particular) cost them $100 million.[8][10][11] The suit was moved from state to federal court at the request of CBS.[12] U.S. District Judge William Fremming Nielsen ruled in 1993 that the apple growers had not proved their case,[13] and it was subsequently dismissed by the United States Court of Appeals for the Ninth Circuit.[14][15]

Elizabeth Whelan and her organization, the American Council on Science and Health (ACSH), which had received $25,000 from Alar's manufacturer,[16] stated that Alar and its breakdown product UDMH had not been shown to be carcinogenic.[17] During a 1990 speech at Hillsdale College, Whelan said that groups like the NRDC were ignoring a basic principle of toxicology: the dose makes the poison. "It is an egregious departure from science and logic when a substance is labeled 'cancer-causing' based on a response in a single animal study using high doses of a test material", she said.[18]

Current views[edit]

Disagreement and controversy remain about the safety of Alar and appropriateness of the response to it. Daminozide remains classified as a probable human carcinogen by the EPA and is listed as a known carcinogen under California's Prop 65.[16]

Consumers Union ran its own studies and estimated that the human lifetime cancer risk was 5 cases per million, as compared to the previously-reported figure of 50 per million. Generally, EPA considers lifetime cancer risks in excess of 1 per million to be cause for action.[19]


  1. ^ "Daminozide toxicity, publication date: 9/93". Extension Toxicology Network. Retrieved 10 September 2013.
  2. ^ a b United States Environmental Protection Agency, "Daminozide (Alar) Pesticide Canceled for Food Uses" Archived October 3, 2012, at the Wayback Machine (press release), 7 November 1989
  3. ^ United States Environmental Protection Agency, Office of Prevention, Pesticides And Toxic Substances (September 1993). "R.E.D. Facts: Daminozide" (PDF). EPA-738-F-93-007. Archived from the original (PDF) on 2006-10-06. {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: multiple names: authors list (link)
  4. ^ a b Montague, Peter (January 29, 1997). "How They Lie – Part 4: The True Story of Alar – Part 2" (PDF). Rachel's Environment & Health News. Environmental Research Foundation.
  5. ^ Oakes, John B. (1989-03-30). "A Silent Spring, for Kids". The New York Times.
  6. ^ Environmental Regulation: Law, Science, & Policy by Percival, et al. (4th ed.) p. 391.
  7. ^ Gunset, Geoprge (3 June 1989). "Apple Chemical Alar Off Market". Chicago Tribune. Retrieved 30 April 2017. However, Uniroyal will continue to export Alar to about 70 countries, which means, critics said, that Americans still will face exposure from imported apple juice.
  8. ^ a b "Apple growers sue over CBS Alar report". Chicago Tribune. Associated Press. 29 November 1990. Retrieved 30 April 2017.
  9. ^ Carlson, Peter (11 February 1990). "The Image Makers". The Washington Post. Retrieved 30 April 2017. Fenton engineered a PR campaign that was the worst thing to happen to the apple since Eve.
  10. ^ Puzo, Daniel P. (20 November 1990). "Apple Growers to File Lawsuit in Alar Dispute". Los Angeles Times. Retrieved 30 April 2017. Agriculture: Eleven farmers will seek $250 million from '60 Minutes' and an environmental group. They charge 'product disparagement.'
  11. ^ Egan, Timothy (July 9, 1991). "Apple Growers Bruised and Bitter After Alar Scare". The New York Times.
  12. ^ "CBS Seeks to Move Alar Suit". Lewiston Morning Tribune. Associated Press. 4 January 1991. Retrieved 30 April 2017. Lawyers for the network and its affiliates said the issue involved freedom of speech and should be heard in federal court.
  13. ^ "Apple Growers' Lawsuit Against Cbs Thrown Out". Orlando Sentinel. 14 September 1993. Retrieved 30 April 2017. First Amendment law requires plaintiffs bringing such lawsuits to prove media reports were false.
  14. ^ "Appellate Brief (1994) for CBS in Alar Case". Food Speak: Coalition for Free Speech. CSPI. Archived from the original on June 15, 2010. Retrieved April 4, 2012.
  15. ^ Bernard, Mitchell S. (2 June 2013). "The Natural Resources Defense Council was right on Alar in 1989 and it still is". The Washington Examiner. Retrieved 30 April 2017. Mitchell S. Bernard is litigation director for the Natural Resources Defense Council.
  16. ^ a b Neff RA, Goldman LR (2005). "Regulatory parallels to Daubert: stakeholder influence, "sound science," and the delayed adoption of health-protective standards". Am J Public Health. 95 Suppl 1: S81–91. doi:10.2105/AJPH.2004.044818. hdl:10.2105/AJPH.2004.044818. PMID 16030344. S2CID 10175577.
  17. ^ Kroll, Andy; Schulman, Jeremy (28 October 2013). "Leaked Documents Reveal the Secret Finances of a Pro-Industry Science Group". Mother Jones. Foundation for National Progress. Retrieved 30 April 2017. Initially, ACSH disclosed its donors, and it was obvious that the group embraced numerous causes connected to its funders. ACSH defended the chemical Alar, used to regulate the growth of apples – and accepted donations from Uniroyal, which manufactured and sold Alar.
  18. ^ Whelen, Elizabeth (June 1991). "Cancer Scares And Our Inverted Health Priorities". Imprimis. 20 (6).
  19. ^ Sadowitz, March; Graham, John. "A Survey of Residual Cancer Risks Permitted by Health, Safety and Environmental Policy". Archived from the original on 2013-03-28. Retrieved Aug 24, 2012.


External links[edit]