Methional is an organic compound with the formula CH3SCH2CH2CHO. It is a colorless liquid that is a degradation product of methionine. It is a notable flavor in potato-based snacks, namely potato chips, one of the most popular foods containing methional. Traces of the compound can also be found in black tea and green tea based products. Methional contains both aldehyde and thioether functional groups. It is readily soluble in alcohol solvents, including propylene glycol and dipropylene glycol.

CAS：3268-49-3
中文别名：3-(甲基硫代)丙醛;β-甲硫基丙醛;2-硫代丁醛;3-(甲硫基)丙醛;甲硫基丙醛;菠萝醛;甲基巯基丙醛;
英文别名：3-Methylthiopropana;Propanal, 3-(methylthio)-;3-methylsulfanylpropanal;Methional;3-(Methylmercapto)propionaldehyde;4-Thiapentanal;3-(Methylmercapto)propionaldehyde (3-(Methylthio)propanal;3-(Methylthio)propionaldehyde;3-(Methylthio)propanal;3-methylsulfanyl-propionaldehyde;MeSCH2CH2CHO;
分子式：C4H8OS
分子量：104.171
精确质量：104.03
Psa：42.37
Logp：0.9384

EINECS号：221-882-5
MDL号：MFCD00007022

外观与性状：无色至琥珀色液体,带有一种极其恶臭的和持久的气味
密度：1.043g/mLat 25°C(lit.)
沸点：165-166°C(lit.)
熔点：-68°C
闪点：142°F
折射率：n20/D 1.483(lit.)
稳定性：Stable at room temperature in closed containers under normal storage and handling conditions.
储存条件：库房通风低温干燥,与食品、氧化剂分开储运
蒸汽密度：>1 (vs air)
蒸汽压：760 mm Hg ( 165 °C)

RTECS号：UE2285000
安全说明：S26-S36/37/39-S45-S37/39
危险类别码：R20; R36/37/38
WGK Germany：1
危险品运输编码：UN 2785 6.1/PG 3
海关编码：29309070
危险类别：6.1(b)
包装等级：III
危险品标志：Xn

生产方法
丙烯醛与甲硫醇经加成反应而得。将丙烯醛和甲酸加入反应锅中,搅拌下加入乙酸酮,加热至30-40℃,通入经冷却;酸洗脱水的甲硫醇,至反应液相对密度达到1.060-1.074(20℃),即得3-甲硫基丙醛 用作食用香精、医药蛋氨酸的中间体。
用途
用作食用香精、医药蛋氨酸的中间体。