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Family | Compounds | Ref. |
---|---|---|
Alkaloids | Caffeine, theobromine, theophyline, trigonelline, nicotinic acid, pyrrolomorpholine spiroketal alkaloids. | [489,490,491,492,493,494] |
Amino acids | Alanine, asparagine, leucine, glycine, aspartic acid, histidine, phenylalanine, serine, lysine, valine | [495,496,497,498] |
Carotenoids | β-carotene, α-carotene, violaxanthin, neoxanthin. | [499,500] |
Fatty acids | Linoleic, palmitic, oleic, stearic, arachic, docosanoic, tetracosanoic, eicosenoic, myristic acid, linolenic acids. | [496,497,501] |
Flavonoids | Quercetin, catechin, epicatechin, picatechin gallate, kaempferol, luteolin, fisetin, rutin, myricetin, quercitrin, pigenin. | [502,503] |
Organic acids | Acetic, citric, lactic, quinic, oxalic, malic, succinic, formic, tartaric acids. | [491,504,505,506] |
Phenolic acids | Caffeic, chlorogenic, cinnamic, p-hydroxybenzoic acid, ferulic, p-coumaric, vanillic, benzoic, protocatechuic, gentosic, cinapic, caftaric acids. | [483,507,508,509,510] |
Sugars | Sucrose, fructose, glucose, arabinose. | [511,512,513,514] |
Terpenes | Ursolic acid, caffruones, caffruenols, tricalysiolides, caffarolides, bengalensol, mascarosides, villanovane, atractyligenin, cafestol, kahweol, dehydrocafestol, cafestal. | [490,502,503,515,516,517,518,519] |
Volatiles | aldehydes, esters, ketones, furans, thiophenes, pyrazine, pyrroles, thiazoles, olefins, alcohols, oxazoles, pyridine, geosmin. | [520,521,522,523,524,525,526] |
Benefits | Key components | Ref. |
---|---|---|
Antibacterial | caffeic acid caffeic acid phenethyl ester chlorogenic acids eugenol ferulic acid furaneol guaiacol isoeugenol protocatechuic acid scopoletin vanillic acid |
[533,534,535] [536,537] [538] [539,540,541,542,543,544,545,546,547] [548,549,550,551] [552] [553,554,555] [547,556,557,558,559] [560,561,562,563,564,565] [566,567,568,569,570,571] [561,572,573] |
Anticarcinogenic | 4-vinylguaiacol cafestol and kahweol caffeic acid caffeic acid phenethyl ester chlorogenic acids eugenol ferulic acid quercetin mangiferin protocatechuic acid tannic acid theobromine vanillic acid vanillin |
[574,575] [576,577,578,579] [580,581,582,583,584,585] [586,587,588,589,590] [538,591] [592,593,594,595,596,597,598,599,600,601,602,603,604,605,606,607,608] [609,610,611,612,613,614,615,616,617,618,619,620,621,622,623] [624,625,626,627,628] [629] [630,631,632,633,634,635,636] [637,638,639,640,641,642,643,644,645,646] [647,648,649] [650,651,652,653,654] [655,656,657,658,659,660,661,662,663] |
Antidiabetic | cafestol caffeic acid caffeol chlorogenic acids isoeugenol scopoletin trigonelline |
[664,665] [666,667,668,669,670] [483,671] [666,672,673,674,675,676,677] [678] [679,680,681,682,683] [684] |
Antifungal | caffeine eugenol furaneol isoeugenol vanillin |
[685] [686,687,688,689,690,691] [552] [692,693,694,695] [696,697,698] |
Antiinflamatory effects | 4-ethylguaiacol caffeine dicaffeoylquinic acids dihydrocaffeic acid eugenol ferulic acid flavonoids mangiferin phenolic acids and pyrocatechol p-coumaric acid rutin theophylline vanillic acid vanillin vanillyl alcohol |
[699,700,701] [702] [703] [704] [539,705,706,707,708,709,710] [711,712] [629] [703] [629] [713] [714,715,716,717,718,719] [703] [720,721,722,723,724] [725,726,727,728,729,730,731,732] [733,734,735,736,737,738,739] [740] |
Antiobesity | chlorogenic acids kahweol |
[672,741,742,743,744] [745,746,747] |
Cardioprotection | caffeic acid chlorogenic acids dihydrocaffeic acid ferulic acid |
[748,749,750,751,752] [591,753,754,755,756] [757] [758,759,760,761,762,763,764] |
Cognitive enhancement | paraxanthine protocatechuic acid theobromine vanillic acid |
[765,766] [767,768,769,770] [771,772] [773,774] |
Gastroprotection | chlorogenic acids vanillin |
[591] [775,776] |
Hepatoprotection | caffeic acid chlorogenic acids dihydrocaffeic acid paraxanthine theobromine vanillin |
[777,778,779,780] [591] [453] [781,782,783] [784] [785,786,787,788] |
Immunoregulation | p-coumaric acid protocatechuic acid |
[718] [789,790] |
Kidney protection | protocatechuic acid theobromine |
[791,792,793,794,795] [796,797,798,799] |
Neuroprotection | caffeine caffeic acid chlorogenic acids dihydrocaffeic acid eugenol ferulic acid isoeugenol paraxanthine protocatechuic acid quercetin scopoletin tannic acid theobromine trigonelline lipid-Lower vanillic acid vanillyl alcohol |
[800,801,802,803,804,805,806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821] [483,822,823,824] [483,825,826,827,828,829,830,831,832,833,834] [835] [836] [837,838,839,840,841,842,843,844,845,846,847] [836,848] [816,849,850,851,852] [853,854,855,856,857,858,859,860,861,862,863,864,865,866] [624,867,868,869,870,871,872,873,874,875,876] [877,878,879,880,881,882] [883,884,885,886,887,888] [889,890,891] [483] [736,892,893,894,895,896] [897,898,899,900] [901] |
Lipid-Lowering Effects | caffeic acid chlorogenic acids |
[902] [591,671,902,903] |
Parent molecule | Ref. |
---|---|
caffeic acid | [752,904,905,906,907,908,909,910,911,912,913,914,915] |
caffeine | [916,917,918,919,920,921,922,923,924] |
chlorogenic acid | [925,926,927,928,929,930,931,932] |
eugenol | [933,934,935,936,937,938,939,940,941,942,943,944,945,946,947,948,949,950,951,952] |
ferulic acid | [609,611,953,954,955,956,957,958,959,960,961,962,963,964,965,966,967,968,969,970,971,972,973,974,975,976,977,978,979,980,981,982,983,984,985] |
guaiacol | [986,987,988] |
isoeugenol | [694,989,990,991,992] |
isoferulic acid | [993,994] |
p-coumaric acid | [716,995–1001] |
protocatechuic acid | [1002–1008] |
scopoletin | [683,1009–1020] |
theobromine | [1021–1029] |
theophylline | [1030–1051] |
vanillic acid | [1052–1058] |
vanillin | [1059–1085] |
xanthine | [1086–1109] |
Common name | Structure | IUPAC name | Ref. |
---|---|---|---|
4-ethylguaiacol | 4-ethyl-2-methoxyphenol | [1110–1112] | |
4-vinylguaiacol | 4-ethenyl-2-methoxyphenol | [1113–1115] | |
caffeic acid | (E)-3-(3,4-dihydroxyphenyl)prop-2-enoic acid | [669,748,1116–1128] | |
caffeine | 1,3,7-trimethylpurine-2,6-dione | [806,1129–1132] | |
chlorogenic acid | (1S,3R,4R,5R)-3-[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy-1,4,5-trihydroxycyclohexane-1-carboxylic acid | [404,405,748,1116,1133–1143] | |
dihydrocaffeic acid | 3-(3,4-dihydroxyphenyl)propanoic acid | [1144–1146] | |
eugenol | 2-methoxy-4-prop-2-enylphenol | [706,707,934,1147–1160] | |
ferulic acid | (E)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoic acid | [711,712,837,1114,1161–1168] | |
guaiacol | 2-methoxyphenol | [1169,1170] | |
isoeugenol | 2-methoxy-4-[(E)-prop-1-enyl]phenol | [547,559,1171] | |
isoferulic acid | (E)-3-(3-hydroxy-4-methoxyphenyl)prop-2-enoic acid | [1172–1175] | |
paraxanthine | 1,7-dimethyl-3H-purine-2,6-dione | [1176] | |
p-coumaric acid | (E)-3-(4-hydroxyphenyl)prop-2-enoic acid | [714,1122,1177–1181] | |
protocatechuic acid | 3,4-dihydroxybenzoic acid | [561,1182–1195] | |
scopoletin | 7-hydroxy-6-methoxychromen-2-one | [1196–1201] | |
tannic acid | [2,3-dihydroxy-5-[[(2R,3R,4S,5R,6S)-3,4,5,6-tetrakis[[3,4-dihydroxy-5-(3,4,5-trihydroxybenzoyl) oxybenzoyl]oxy]oxan-2-yl]methoxycarbonyl]phenyl] 3,4,5-trihydroxybenzoate | [1202–1212] | |
theobromine | 3,7-dimethylpurine-2,6-dione | [1213,1214] | |
theophylline | 1,3-dimethyl-7H-purine-2,6-dione | [1214–1216] | |
vanillic acid | 4-hydroxy-3-methoxybenzoic acid | [1217–1221] | |
vanillin | 4-hydroxy-3-methoxybenzaldehyde | [788,1112,1218,1222–1226] | |
vanillyl alcohol | 4-(hydroxymethyl)-2-methoxyphenol | [1227,1228] | |
xanthine | 3,7-dihydropurine-2,6-dione | [1176,1213] |
Single Step Mechanisms | |
---|---|
Radical Adduct Formation (RAF) HnAntiox + •R → [HnAntiox-R]• Relevant for antioxidants with multiple bonds and electrophilic free radicals. Viable in polar and non polar media. |
Examples: Carotenoids + •OOH,[1243] or benzylperoxyl [1244] or alkyl, alkoxyl, and alkylperoxyl radicals. [1245] •OH scavenging activity of caffeine, [478] gentisic acid, [1246] hydroxybenzyl alcohols, [1247] edaravone,[1248,1249] melatonin,[1250] and its metabolites,[1251,1252] carnosine, [1253] and rebamipide. [1254] |
Single Electron Transfer (SET) HnAntiox + •R → HnAntiox +• + R- Relevant for electrophilic free radicals and antioxidants that are good electron donors. Viable in polar media. |
Examples: For antioxidants curcumin,[1255] and highly galloylated tannin fractions.[1256] Edaravone derivatives + •OH, •OCCl3 and CH3COO•.[1257] Resveratrol with oxygen radical.[1258] Catechin analogues with ROO•. [1259] Carotenoids with CCl3OO• [1260,1261] and •NO2 [1262,1263]. |
Formal Hydrogen Atom Transfer (f-HAT) HnAntiox + •R → Hn-1Antiox• + HR Relevant for antioxidants with labile H atoms. Viable in polar and non polar media. |
Examples: Polyphenols, [1264] chlorogenic acids, [1265] procyanidins, [1266] chalcones,[1267] cynarine, [1265] orientin, [1268] capsaicin, [1269] silybin, [1265] α-mangostin, [1270] fisetin, [1271] hydroxychalcones, [1272] baicalein, [1271] ellagic acid, [1273] Lipoic acids, [1274] glutathione, [1275] tryptophan, [1276], N-acetylcystein amide.[1277] |
Multiple Step Mechanisms | |
Sequential Proton Loss Electron Transfer (SPLET) HnAntiox → Hn-1Antiox- + H+ Hn-1Antiox- + •R → Hn-1Antiox• + R- Relevant for antioxidants with acid protons. Viable in polar and protic solvents. |
Examples: Curcumin, [1278,1279] esculetin, [1280] alizarin, [1281] deoxybenzoins,[1282] hydroxybenzoic acids, [1283–1286] resveratrol, [1287,1288] fraxetin, [1289] piceatannol, [1290] morin, [1291] hydroxychalcones, [1292–1294] xanthones, [1295] flavonoids, [1296] quercetin, [1297] kaempferol, [1298] gallic acid, [1299] Trolox, [1300] isoflavonoids, [1301,1302] baicalein, [1303] purpurin.[1304] |
Sequential Electron Proton Transfer (SEPT) HnAntiox + •R → Hn-1Antiox•+ + R− Hn-1Antiox•+ → Hn-1Antiox• + H+ Relevant for antioxidants that are good electron donors. Viable in polar and protic solvents. |
Examples: Baicalein, [1305] astaxanthin, [1306] quercetin, in the presence of bases that have HOMO energies lower than that of the SOMO of its radical cation.[1307] DPPH and galvinoxyl radical scavenging activity of vitamin E models. [1308] The theroxyl radical-scavenging process of α-tocopherol.[1309] |
Sequential Proton Loss Hydrogen Atom Transfer (SPLHAT) HnAntiox → Hn-1Antiox− + H+ Hn-1Antiox− + •R → Hn-2Antiox•− + HR Relevant for antioxidants with acid protons and labile H atoms. Viable in polar and protic solvents. |
Examples: α-mangostin, [1270] ellagic acid, [1310] propyl gallate, [1311] caffeic and other phenolic acids. [1312] Esculetin + •OOCH3 and •OOCHCH2 radicals. [1280] Gallic acid + •OH. [1313] |
Component | k (M-1 s-1, at 298 K) | Ref. |
---|---|---|
caffeic acid | 3.93E+04 | [457] |
caffeine | 3.19E+01 | [478] |
dihydrocaffeic acid | 4.95E+04 | [457] |
eugenol | 2.49E+03 | [1314] |
ferulic acid | 9.13E+03 | [457] |
guaiacol | 1.55E+03 | [1314] |
p-coumaric acid | 4.35E+03 | [457] |
paraxanthine | 1.05E+00 | [1315] |
protocatechuic acid | 5.14E+03 | [1316] |
theobromine | 5.34E+01 | [1315] |
theophyline | 4.21E+00 | [1315] |
Trolox | 3.40E+03 | [1300] |
vainillin | 9.75E+01 | [1314] |
vanillic acid | 1.29E+01 | [1314] |
vanillyl alcohol | 5.67E+03 | [1314] |
Component | k (M-1 s-1, at 298 K, pH=7.4) | Ref. |
---|---|---|
caffeic acid | 2.69E+08 | [457] |
caffeine | 3.29E-01 | [478] |
dihydrocaffeic acid | 1.04E+08 | [457] |
eugenol | 1.55E+06 | [1314] |
ferulic acid | 3.36E+08 | [457] |
guaiacol | 2.38E+06 | [1314] |
p-coumaric acid | 8.51E+07 | [457] |
paraxanthine | 4.18E+02 | [1315] |
protocatechuic acid | 1.26E+07 | [1316] |
theobromine | 2.76E-01 | [1315] |
theophyline | 3.86E-02 | [1315] |
Trolox | 8.96E+04 | [1300] |
vainillin | 1.54E+05 | [1314] |
vanillic acid | 1.65E+07 | [1314] |
vanillyl alcohol | 4.12E+06 | [1314] |
Component | Mechanism | Site | Ref. |
---|---|---|---|
caffeic acid | f-HAT | [457] | |
caffeine | RAF | [478] | |
dihydrocaffeic acid | f-HAT | [457] | |
eugenol | f-HAT | [1314] | |
ferulic acid | f-HAT | [457] | |
guaiacol | f-HAT | [1314] | |
p-coumaric acid | f-HAT | [457] | |
paraxanthine | RAF | [1315] | |
protocatechuic acid | f-HAT | [1316] | |
theobromine | RAF | [1315] | |
theophyline | RAF | [1315] | |
vainillin | f-HAT | [1314] | |
vanillic acid | f-HAT | [1314] | |
vanillyl alcohol | f-HAT | [1314] |
Component | Mechanism | Site or species | Ref. | |
---|---|---|---|---|
caffeic acid | SPLET | phenolate anion | [457] | |
caffeine | RAF | [478] | ||
dihydrocaffeic acid | SPLET | phenolate anion | [457] | |
eugenol | SPLET | phenolate anion | [1314] | |
ferulic acid | SPLET | phenolate anion | [457] | |
guaiacol | SPLET | phenolate anion | [1314] | |
p-coumaric acid | SPLET | phenolate anion | [457] | |
paraxanthine | RAF | [1315] | ||
protocatechuic acid | SPLET | phenolate anion | [1316] | |
theobromine | RAF | [1315] | ||
theophyline | RAF | [1315] | ||
vainillin | SPLET | phenolate anion | [1314] | |
vanillic acid | SPLET | phenolate anion | [1314] | |
vanillyl alcohol | SPLET | phenolate anion | [1314] |
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