二甲氨苯酸辛酯

二甲氨苯酸辛酯
	IUPAC名; 2-ethylhexyl 4-(dimethylamino)benzoate
别名	帕地马酯O; Escalol 507; Sundown; OD-PABA(octyldimethyl PABA)
识别
CAS号	21245-02-3
PubChem	30541
ChemSpider	28343
SMILES	O=C(OCC(CC)CCCC)c1ccc(N(C)C)cc1;
InChI	1/C17H27NO2/c1-5-7-8-14(6-2)13-20-17(19)15-9-11-16(12-10-15)18(3)4/h9-12,14H,5-8,13H2,1-4H3;
InChIKey	WYWZRNAHINYAEF-UHFFFAOYAL
KEGG	D05335
性质
化学式	C17H27NO2
摩尔质量	277.4 g·mol−1
密度	0.99 g/cm3
熔点	<25 °C
沸点	362 °C（635 K）
危险性
NFPA 704	1 1 0
	若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。

二甲氨苯酸辛酯，俗称帕地马酯O（英语：Padimate O）是一种有机化合物，为对氨基苯甲酸（PABA）衍生物，可吸收紫外线，常用于防晒剂中。为淡黄色油状液体，不溶于水，由2-乙基己醇与二甲氨基苯甲酸发生酯化反应得到。

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二甲氨苯酸辛酯可以吸收中波紫外光（UVB，波长315–280 nm），防止紫外线对DNA造成直接损伤。但吸收紫外光后产生的激发态二甲氨苯酸辛酯会与DNA反应造成间接损伤，产生电离辐射类似的伤害效果。1993年一项针对酵母的体外研究证实二甲氨苯酸辛酯会产生光诱导的致突变性^[1]。作为米氏酮衍生物，二甲氨苯酸辛酯同样被认为和米氏酮一样对小鼠产生光致癌性^[2]。

然而，在众多在无毛小鼠上展开的局部活体实验证实二甲氨苯酸辛酯没有致癌性，而且二甲氨苯酸辛酯可以减少和延缓紫外线诱发的皮肤肿瘤的出现^[3]^[4]^[5]^[6]。

二甲氨苯酸戊酯（帕地马酯A）
防晒乳

[1]
Knowland, John; McKenzie, Edward A; McHugh, Peter J; Cridland, Nigel A. Sunlight-induced mutagenicity of a common sunscreen ingredient. FEBS Letters. 1993, 324 (3): 309–13. PMID 8405372. S2CID 23853321. doi:10.1016/0014-5793(93)80141-G.
[2]
Gulston, Melanie; Knowland, John. Illumination of human keratinocytes in the presence of the sunscreen ingredient Padimate-O and through an SPF-15 sunscreen reduces direct photodamage to DNA but increases strand breaks. Mutation Research/Genetic Toxicology and Environmental Mutagenesis. 1999, 444 (1): 49–60. PMID 10477339. doi:10.1016/S1383-5718(99)00091-1.
[3]
Kligman, Lorraine H.; Akin, Frank J.; Kligman, Albert M. Sunscreens prevent ultraviolet photocarcinogenesis. Journal of the American Academy of Dermatology. 1980, 3 (1): 30–5. PMID 6967495. doi:10.1016/S0190-9622(80)80221-0.
[4]
Bissett, Donald L.; McBride, James F.; Hannon, Daniel P.; Patrick, Larry F. Time-dependent decrease in sunscreen protection against chronic photodamage in UVB-irradiated hairless mouse skin. Journal of Photochemistry and Photobiology B: Biology. 1991, 9 (3–4): 323–334. PMID 1919875. doi:10.1016/1011-1344(91)80169-I.
[5]
Bissett, Donald L; McBride, James F. Synergistic topical photoprotection by a combination of the iron chelator 2-furildioxime and sunscreen. Journal of the American Academy of Dermatology. 1996, 35 (4): 546–9. PMID 8859281. doi:10.1016/S0190-9622(96)90677-5.
[6]
Kerr, Caroline. The effects of two UVB radiation-absorbing sunscreens on UV radiation-induced carcinogenesis, suppression of the contact hypersensitivity response and histological changes in the hairless mouse. Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis. 1998, 422 (1): 161–4. PMID 9920441. doi:10.1016/S0027-5107(98)00188-2.

[Knowland1993-1] [1]
Knowland, John; McKenzie, Edward A; McHugh, Peter J; Cridland, Nigel A. Sunlight-induced mutagenicity of a common sunscreen ingredient. FEBS Letters. 1993, 324 (3): 309–13. PMID 8405372. S2CID 23853321. doi:10.1016/0014-5793(93)80141-G.

[Sensitization-2] [2]
Gulston, Melanie; Knowland, John. Illumination of human keratinocytes in the presence of the sunscreen ingredient Padimate-O and through an SPF-15 sunscreen reduces direct photodamage to DNA but increases strand breaks. Mutation Research/Genetic Toxicology and Environmental Mutagenesis. 1999, 444 (1): 49–60. PMID 10477339. doi:10.1016/S1383-5718(99)00091-1.

[3] [3]
Kligman, Lorraine H.; Akin, Frank J.; Kligman, Albert M. Sunscreens prevent ultraviolet photocarcinogenesis. Journal of the American Academy of Dermatology. 1980, 3 (1): 30–5. PMID 6967495. doi:10.1016/S0190-9622(80)80221-0.

[4] [4]
Bissett, Donald L.; McBride, James F.; Hannon, Daniel P.; Patrick, Larry F. Time-dependent decrease in sunscreen protection against chronic photodamage in UVB-irradiated hairless mouse skin. Journal of Photochemistry and Photobiology B: Biology. 1991, 9 (3–4): 323–334. PMID 1919875. doi:10.1016/1011-1344(91)80169-I.

[5] [5]
Bissett, Donald L; McBride, James F. Synergistic topical photoprotection by a combination of the iron chelator 2-furildioxime and sunscreen. Journal of the American Academy of Dermatology. 1996, 35 (4): 546–9. PMID 8859281. doi:10.1016/S0190-9622(96)90677-5.

[6] [6]
Kerr, Caroline. The effects of two UVB radiation-absorbing sunscreens on UV radiation-induced carcinogenesis, suppression of the contact hypersensitivity response and histological changes in the hairless mouse. Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis. 1998, 422 (1): 161–4. PMID 9920441. doi:10.1016/S0027-5107(98)00188-2.

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二甲氨苯酸辛酯

IUPAC名 2-ethylhexyl 4-(dimethylamino)benzoate
别名	帕地马酯O Escalol 507 Sundown OD-PABA_{(octyldimethyl PABA)}
识别
CAS号	21245-02-3 ^Y
PubChem	30541
ChemSpider	28343
SMILES	O=C(OCC(CC)CCCC)c1ccc(N(C)C)cc1
InChI	1/C17H27NO2/c1-5-7-8-14(6-2)13-20-17(19)15-9-11-16(12-10-15)18(3)4/h9-12,14H,5-8,13H2,1-4H3
InChIKey	WYWZRNAHINYAEF-UHFFFAOYAL
KEGG	D05335
性质
化学式	C₁₇H₂₇NO₂
摩尔质量	277.4 g·mol⁻¹
密度	0.99 g/cm³
熔点	<25 °C
沸点	362 °C（635 K）
危险性
NFPA 704	1 1 0
若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。