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Pyrazine

Description References
Pyrazine
Pyrazine structure
CAS No.
290-37-9
Chemical Name:
Pyrazine
Synonyms
PyBO;Pyrazin;Piazine;PYRAZINE;p-Diazine;FEMA 4015;1,4-DIAZINE;Paradiazine;Pyrazine>1,4-Pyrazine
CBNumber:
CB1450659
Molecular Formula:
C4H4N2
Formula Weight:
80.09
MOL File:
290-37-9.mol

Pyrazine Properties

Melting point:
50-56 °C(lit.)
Boiling point:
115-116 °C(lit.)
Density 
1.031 g/mL at 25 °C(lit.)
FEMA 
4015 | PYRAZINE
refractive index 
1.5235
Flash point:
132 °F
storage temp. 
Flammables area
solubility 
SOLUBLE
pka
0.65(at 27℃)
form 
Crystals
color 
White
Specific Gravity
1.031
Water Solubility 
SOLUBLE
Sensitive 
Hygroscopic
JECFA Number
951
Merck 
14,7957
BRN 
103905
Stability:
Stable. Highly flammable. Incompatible with acids, oxidizing agents.
Substances Added to Food (formerly EAFUS)
PYRAZINE
CAS DataBase Reference
290-37-9(CAS DataBase Reference)
EWG's Food Scores
1
FDA UNII
2JKE371789
NIST Chemistry Reference
Pyrazine(290-37-9)
EPA Substance Registry System
Pyrazine (290-37-9)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS02,GHS07
Signal word  Danger
Hazard statements  H315-H319-H228-H335
Precautionary statements  P210-P370+P378-P261-P305+P351+P338-P405-P501a-P240-P241-P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313
Hazard Codes  Xi,F
Risk Statements  36/37/38-11
Safety Statements  26-36-16
RIDADR  UN 1325 4.1/PG 2
WGK Germany  3
RTECS  UQ2015000
TSCA  T
HazardClass  4.1
PackingGroup  III
HS Code  29339990

Pyrazine price More Price(16)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich P56003 Pyrazine ≥99% 290-37-9 5g $20.2 2020-08-18 Buy
Sigma-Aldrich 65693 Pyrazine analytical standard 290-37-9 100mg $49.3 2020-08-18 Buy
TCI Chemical P0544 Pyrazine >98.0%(GC) 290-37-9 25g $27 2020-06-24 Buy
TCI Chemical P0544 Pyrazine >98.0%(GC) 290-37-9 500g $206 2020-06-24 Buy
Alfa Aesar 016326 Pyrazine, 98% 290-37-9 50g $79.6 2020-06-24 Buy

Pyrazine Chemical Properties,Uses,Production

Description

Pyrazine is a heterocyclic aromatic organic compound and can be reacted to obtain diverse pyrazine derivatives. Pyrazines are important contributors to the flavor of various roasted, toasted, or similarly heated foods. Pyrazine derivatives exhibit a wide variety of aromas in food, e.g. 2-methoxy-3-isopropylpyrazine produces a green pea odor. Pyrazines and pyrazine derivatives are typically used as flavor agent. Pyrazines and Pyrazine derivatives are also used as fragrances.

References

[1] T.B. Adamsa, J. Doullb, V.J. Feronc, J.I. Goodmand, L.J. Marnette, I.C. Munrof, P.M. Newberneg, P.S. Portogheseh, R.L. Smithi, W.J. Waddellj and B.M. Wagnerk, The FEMA GRAS assessment of pyrazine derivatives used as flavor ingredients, Food and Chemical Toxicology, 2002, vol. 40, 429-451

Chemical Properties

white crystals or powder

Chemical Properties

Pyrazine has a strong pyridine-like odor. Some reports compare the taste of pyrazine to cooked spinach or rancid peanuts

Occurrence

Pyrazine has been detected in several food products including papayas, asparagus, peanuts, popcorn, soybeans, corn, French fries, bread, cheese, milk, eggs (boiled), chicken (fried), beef (cooked), shrimp, clams, beer, sherry, malt, coffee and tea (green).

Preparation

Prepared by cyclization of α-amino ketones, which were produced by the reduction of isonitroso ketones to yield the dihydropyrazines, which are dehydrogenated with mercury(I) oxide or copper(II) sulfate or sometimes with atmospheric oxygen.

Definition

ChEBI: A diazine that is benzene in which the carbon atoms at positions 1 and 4 have been replaced by nitrogen atoms.

Definition

A heterocyclic aromatic compound with a six-membered ring containing four carbon atoms and two nitrogen atoms.

Definition

pyrazine: An unsaturated heterocycliccompound having two nitrogenatoms in a six-membered ring,C4H4N2; r.d. 1.03; m.p. 52°C; b.p.115°C. Pyrazine is a symmetric diazine.

Aroma threshold values

300 ppm (odor threshold in water)

Purification Methods

Distil pyrazine in steam and crystallise it from water. Purify also by zone melting. [Beilstein 23 H 91, 23 II 80, 23 III/IV 899, 23/5 V 351.]

Pyrazine Preparation Products And Raw materials

Raw materials

Preparation Products


Pyrazine Suppliers

Global( 257)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Capot Chemical Co.,Ltd.
+86(0)13336195806 +86-571-85586718
+86-571-85864795 sales@capotchem.com China 19929 60
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 info@tnjchem.com China 2754 55
career henan chemical co
+86-371-86658258
sales@coreychem.com CHINA 30039 58
Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 linda@hubeijusheng.com CHINA 28231 58
Jinan Finer Chemical Co., Ltd
+86-531-88989536
+86-531-88989539 sales@finerchem.com CHINA 998 58
Haihang Industry Co.,Ltd
86-531-88032799
+86 531 8582 1093 export@haihangchem.com CHINA 10132 58
Hebei Aicrowe Biotech Co., Ltd
0311-66855331
aicrowe@kf-chem.com CHINA 315 58
Xiamen AmoyChem Co., Ltd
+86 592-605 1114
sales@amoychem.com CHINA 6371 58
Hubei xin bonus chemical co. LTD
86-13657291602
027-59338440 linda@hubeijusheng.com CHINA 23045 58
BOC Sciences
1-631-619-7922 1-631-619-7922
1-631-614-7828 inquiry@bocsci.com United States 20039 58

View Lastest Price from Pyrazine manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-05-20 High quality with best price Pyrazine 290-37-9 kf-wang(at)kf-chem.com
290-37-9
US $20.00 / Kg/Drum 1g 99.8% 5000 Hebei Aicrowe Biotech Co., Ltd
2020-04-28 Pyrazine
290-37-9
US $0.00-0.00 / KG 1KG 99.0%+ 800 tons Shaanxi Dideu Medichem Co. Ltd
2018-07-28 Pyrazine
290-37-9
US $100.00 / KG 25KG 98% 1000T career henan chemical co

Pyrazine Spectrum


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