Abietic acid
Names
IUPAC name
Abieta-7,13-dien-18-oic acid
Systematic IUPAC name
(1R,4aR,4bR,10aR)-1,4a-Dimethyl-7-(propan-2-yl)-1,2,3,4,4a,4b,5,6,10,10a-decahydrophenanthrene-1-carboxylic acid
Other names
Abietinic acid; Sylvic acid
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.007.436
EC Number
  • 208-173-3
KEGG
RTECS number
  • TP8580000
UNII
  • InChI=1S/C20H30O2/c1-13(2)14-6-8-16-15(12-14)7-9-17-19(16,3)10-5-11-20(17,4)18(21)22/h7,12-13,16-17H,5-6,8-11H2,1-4H3,(H,21,22)/t16-,17+,19+,20+/m0/s1 checkY
    Key: RSWGJHLUYNHPMX-ONCXSQPRSA-N checkY
  • InChI=1/C20H30O2/c1-13(2)14-6-8-16-15(12-14)7-9-17-19(16,3)10-5-11-20(17,4)18(21)22/h7,12-13,16-17H,5-6,8-11H2,1-4H3,(H,21,22)/t16-,17+,19+,20+/m0/s1
    Key: RSWGJHLUYNHPMX-ONCXSQPRBK
  • O=C(O)[C@]3([C@@H]2C/C=C1/C=C(\CC[C@@H]1[C@@]2(C)CCC3)C(C)C)C
Properties
C20H30O2
Molar mass 302.458 g·mol−1
Appearance Yellow resinous powder, crystals or chunks. Monoclinic plates (from EtOH/water). Colorless solid when pure.
Density 1.06 g/mL
Melting point 172–175 °C (342–347 °F; 445–448 K)[1]
Boiling point 250 °C; 482 °F; 523 K
Insoluble[1]
Solubility in other solvents Very soluble in acetone, petroleum ether, Et2O, and ethanol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Irritant
GHS labelling:
GHS07: Exclamation mark
Warning
H317
P261, P272, P280, P302+P352, P321, P333+P313, P363, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
1
0
0
Safety data sheet (SDS) MSDS
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 ?)
Infobox references

Abietic acid (also known as abietinic acid or sylvic acid) is a mild organic acid found in coniferous trees.

It is a commercially important component of paints, soaps, foods, and soldering flux, and is the primary component of resin acid.

Characteristics

Abietic acid is found in pine trees, including:

Pure abietic acid is a colorless solid, but commercial samples are usually a glassy or partly crystalline yellowish solid that melts at temperatures as low as 85 °C (185 °F).[3]

Abietic acid is soluble in alcohols, acetone, and ethers. Its ester or salt is called an abietate.[4]

Abietic acid belongs to the abietane diterpene group of organic compounds derived from four isoprene units.

Preparation

Abietic acid is extracted from tree rosin[5] (via isomerization) and is the most abundant of several closely related organic acids that constitute most of rosin, the solid portion of the oleoresin of coniferous trees.

Resin acids are converted into ester gum by reaction with controlled amounts of glycerol or other polyhydric alcohols.

Uses

Abietic acid has drying properties, and as ester gum is used in paints, varnishes, and lacquers.[3]

It is also used in soaps, for the analysis of resins, and the preparation of metal resinates.

As rosin

Rosin, of which abietic acid is the principal component:

  • Has been used for centuries as a flux for soldering. (Abietic acid in the flux removes oxidation from the surfaces of metals, increasing their ability to bond with the liquified solder.)
  • Is rubbed on the hair of a violin bow to increase friction.
  • Has been used for centuries for caulking ships.[3]
  • Is approved by the US FDA as a miscellaneous food additive.[6]

Safety

  • As the chief component of rosin, abietic acid is approved by the US FDA as a miscellaneous food additive.[6]
  • Abietic acid is considered a "nonhazardous natural substance" in tall oil ("liquid rosin").[4]
  • In the U.S., abietic acid is listed in the inventory of the Toxic Substances Control Act.
  • Abietic acid is the primary irritant in pine wood and resin. As a contact allergen[7] it is the cause of abietic acid dermatitis. (However, compounds resulting from its oxidation by air elicit stronger responses.) [8]
  • 50% ethanol extracts from Resina pini of Pinus sp. (Pinaceae) showed inhibitory activity against testosterone 5α-reductase prepared from rat prostate. The fraction responsible for this activity was purified, and the active constituent was isolated and identified as abietic acid, which exhibited potent inhibitory activity against testosterone 5α-reductase in vitro.[9]

References

  1. 1 2 Merck Index, 12th Edition, 3. Abietic Acid
  2. ↑ "Abietic Acid". Dr. Duke's Phytochemical and Ethnobotanical Databases. Archived from the original on 2015-09-23. Retrieved 13 January 2012.
  3. 1 2 3 Hoiberg, Dale H., ed. (2010). "abietic acid". Encyclopædia Britannica. Vol. I: A-ak Bayes (15th ed.). Chicago, Illinois: Encyclopædia Britannica Inc. pp. 32. ISBN 978-1-59339-837-8.
  4. 1 2 Lars-Hugo Norlin "Tall Oil" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim.doi:10.1002/14356007.a26_057
  5. ↑ G. C. Harris and T. F. Sanderson (1963). "Abietic Acid". Organic Syntheses. 32: 1.; Collective Volume, vol. 4, p. 1
  6. 1 2 Nutrition, Center for Food Safety and Applied (2022-08-25). "Food Additive Status List". FDA.
  7. ↑ El Sayed, F; Manzur, F; Bayle, P; Marguery, MS; Bazex, J (1995). "Contact urticaria from abietic acid". Contact Dermatitis. 32 (6): 361–2. doi:10.1111/j.1600-0536.1995.tb00628.x. PMID 7554886. S2CID 36139468.
  8. ↑ Hausen, BM; Krohn, K; Budianto, E (1990). "Contact allergy due to colophony (VII). Sensitizing studies with oxidation products of abietic and related acids". Contact Dermatitis. 23 (5): 352–8. doi:10.1111/j.1600-0536.1990.tb05171.x. PMID 2096024. S2CID 34726630.
  9. ↑ Seong-Soo Roh, Moon-Ki Park and Yong-ung Kim (2010). "Abietic Acid from Resina Pini of Pinus Species as a Testosterone 5α-Reductase Inhibitor". J. Health Sci. 56 (4): 451–455. doi:10.1248/jhs.56.451.
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