Agent Name

1-Naphthaleneacetic acid

Alternative Name

alpha-Naphthylacetic acid

CAS Number




Major Category



alpha-Naphthylacetic acid; 1-Naphthylacetic acid; 1-Naphthylessigsaeure; 2-(1-Naphthyl)acetic acid; 2-(alpha-Naphthyl)ethanoic aid; ANU; Acide naphthylacetique [French]; Acide naphtylacetique [French]; Acide naphtylacetique [ISO-French]; Agronaa; Alman; Alphaspra; Appl-set; Biokor; Celmone; Etifix; Floramon; Fruit Fix; Fruitofix; Fruitone N; Hormofix; Klingtite; Kyselina 1-naftyloctova [Czech]; Liqui-stik; N 10; NAA; NAA 800; NU-Tone; Nafusaku; Naphthalene-1-acetic acid; Naphthaleneacetic acid; Naphthaleneacetic acid (VAN); Naphthyl-1-essigsaeure [German]; Naphyl-1-essigsaeure [German]; Niagara-stik; Phyomone; Pimacol-sol; Planofix; Planofixe; Plucker; Pomoxon; Primacol; Rasin; Regenasol; Rhizopon B; Rhodofix; STIK; Stafast; Stop-Drop; Tekkam; Tip-Off; Transplantone; Tre-Hold; Vardhak; alpha-NAA; alpha-Naphthyleneacetic acid; alpha-Naphthylessigsaeure [German]; [ChemIDplus]


Plant Growth Regulators


White odorless solid; [Hawley] White or beige powder; [MSDSonline]


Used as a plant growth regulator, abscission promoter, and substrate for auxin inducers of specific plant enzymes; Stimulates root formation in cuttings of woody, herbaceous plants, and vines; Prevents premature flower and fruit drop; Controls regrowth of tree sprouts after trimming; Inhibits sprouting in stored potato, turnip, and ornamental bulbs; [HSDB] Registered for use on fruit crops and ornamentals; [Reference #1]


A skin and mucous membrane irritant; A severe eye irritant; High-dose animal studies: reduce food intake, decreased hemoglobin, increased liver enzymes; [HSDB] The naphthalene acetates are metabolized in the body and excreted as glycine and glucoronic acid conjugates within 48 hours of exposure; The most common effect seen in high-dose animal studies is a reduction in body weight; 1-naphthaleneacetic acid derivatives covered in the RED are the acetamide (CAS # 86-86-2), potassium salt (CAS # 15165-79-4), ammonium salt (CAS # 25545-89-5), sodium salt (CAS # 61-31-4), and ethyl ester (CAS # 2122-70-5);[Reference #1]


See Reference #1.

Reference Link

EPA Pesticide Chemical Search

Exposure Assessment
Vapor Pressure

1.59E-5 mm Hg

Lethal Concentration

LC50 (rat) > 207,000 mg/m3

Adverse Effects

Hepatotoxin, Secondary

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

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Related Information in HazMap

Industrial Processes with risk of exposure: