淡黄色至淡褐色非结晶粉末。对热稳定。分d、l两种异构体,混合熔点132℃。溶于水、乙醇、丙二醇、甘油等强极性有机溶剂,不溶于油脂。在碱性介质中易被氧化。l型的熔点为175~177℃,比旋光度[alDo为- 16.8。
将山茶的茎和叶、儿茶树及黑儿茶的叶干馏后,用水或乙醇提取,再经精制而制得。
可用作抗氧化剂。与维生素E、山梨酸、L-抗坏血酸有协同的抗氧化效果。宜配合使用。
中文名 | 3,4-二羟基苯甲酸 |
英文名 | 3,4-Dihydroxybenzoic acid |
别名 | 原儿茶酸 原儿茶酸对照品, 原儿茶酸(标准品) 邻苯二酚-4-羧酸 3,4-二羟基苯甲酸 原儿茶酸(分析标准品) 原儿茶酸(3,4-二羟基苯甲酸) 原儿茶酸3,4-DIHYDROXYBENZOIC ACID |
英文别名 | AKOS 220-70 Hypogallic acid Protocatechuic aci RARECHEM AL BO 0347 Protocatechuic acid 3,4-dihydroxybenzoate Carbohydroquinonic acid 3,4-DIHYDROBENZOIC ACID 3,4-Dihydroxybenzoic acid 3,4-Dihydroxy benzoic acid CATECHOL-4-CARBOXYLIC ACID PROTOCATECHUIC ACID N-HYDRATE 3,4-Dihydroxybenzoic acid N-HYDRATE cyclohexa-1,5-diene-1-carboxylic acid Protocatechuic acid, 4-Carboxybenzene-1,2-diol, 4-Carboxycatechol |
CAS | 99-50-3 |
EINECS | 202-760-0 |
化学式 | C7H6O4 |
分子量 | 154.12 |
InChI | InChI=1/C7H6O4/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3,8-9H,(H,10,11)/p-1 |
InChIKey | YQUVCSBJEUQKSH-UHFFFAOYSA-N |
密度 | 1.54 |
熔点 | 197-200 °C (dec.) (lit.) |
沸点 | 237.46°C (rough estimate) |
闪点 | 216.3°C |
水溶性 | Soluble in hot alcohol and ether. Slightly soluble in water. |
蒸汽压 | 1.75E-07mmHg at 25°C |
溶解度 | 20g/l |
折射率 | 1.6400 (estimate) |
酸度系数 | 4.48(at 25℃) |
PH值 | 3.78(1 mM solution);3.25(10 mM solution);2.74(100 mM solution) |
存储条件 | Store below +30°C. |
稳定性 | 稳定。与强氧化剂、强碱不相容。 |
敏感性 | Air Sensitive |
外观 | 细结晶粉末 |
颜色 | Beige to brown |
Merck | 14,7894 |
BRN | 1448841 |
物化性质 | 原儿茶酸呈白色至微棕色针状结晶状,熔点约200℃(分解)。溶于热水、乙醇和乙醚,微溶于冷水,不溶于苯。在沸水中分解,并放出二氧化碳。水溶液遇三氯化铁呈绿色,遇碳酸氢钠呈暗红色。 |
MDL号 | MFCD00002509 |
危险品标志 | Xi - 刺激性物品 |
风险术语 | 36/37/38 - 刺激眼睛、呼吸系统和皮肤。 |
安全术语 | S26 - 不慎与眼睛接触后,请立即用大量清水冲洗并征求医生意见。 S36 - 穿戴适当的防护服。 S37/39 - 戴适当的手套和护目镜或面具。 |
WGK Germany | 3 |
RTECS | UL0560000 |
海关编号 | 29182990 |
上游原料 | 香兰素 香草酸甲酯 尼泊金甲酯 |
下游产品 | 胡椒酸酰氯 3,4-二羟基苯甲酸乙酯 3,4-二羟基苯甲酸甲酯 |
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淡黄色至淡褐色非结晶粉末。对热稳定。分d、l两种异构体,混合熔点132℃。溶于水、乙醇、丙二醇、甘油等强极性有机溶剂,不溶于油脂。在碱性介质中易被氧化。l型的熔点为175~177℃,比旋光度[alDo为- 16.8。
将山茶的茎和叶、儿茶树及黑儿茶的叶干馏后,用水或乙醇提取,再经精制而制得。
可用作抗氧化剂。与维生素E、山梨酸、L-抗坏血酸有协同的抗氧化效果。宜配合使用。
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