Table 1 Antifouling activity of 55 compounds against the cyprids of barnacle B. amphitrite (EC50 in μM), toxicity (LC50 in μM) and LC50/EC50 ratios
Compounds | EC50 | LC50 | LC50/EC50 |
|---|---|---|---|
Diorcinol (1) | 32.6 | >217 | >6.67 |
Cordyol C (2) | 57.3 | >203 | >3.54 |
4-Methoxyacyl-diorcinol (3) | 7.43 | >174 | >23.4 |
Cordyol E (4) | 31.0 | >205 | >6.61 |
3,3′-O-dimethylviolaceol-I (5) | 18.4 | >172 | >9.35 |
Cordyol D (6) | 18.2 | >164 | >9.01 |
3-O-propyl-diorcinol (7) | 9.82 | 112 | 11.4 |
3-O-pentyl-diorcinol (8) | 27.9 | >167 | >5.99 |
3-O-acetyl-diorcinol (9) | 3.05 | 64.3 | 21.1 |
3-O-benzoyl-diorcinol (10) | 12.6 | >150 | >11.9 |
3,3′-O-diacetyl-diorcinol (11) | 2.23 | 49.4 | 22.2 |
3,3′-O-dipentyl-diorcinol (12) | 12.2 | >135 | >11.1 |
2,4,6,2′,4′,6′-Hexabromo-diorcinol (13) | 0.71 | 22.0 | 31.0 |
2,6,2′,4′,6′-Pentabromo-4-methoxycarbonyl-diorcinol (14) | 1.17 | 29.3 | 25.0 |
3-O-p-Bromobenzoyl-diorcinol (15) | 2.42 | 60.5 | 25.0 |
1-Formylguaiazulene (16) | 42.0 | 221 | 5.26 |
1-Formyl-4-methyl-7-isopropylazulene (17) | 14.7 | >236 | >16.1 |
Ochracenoid A (18) | 83.3 | 208 | 2.5 |
3,8-Dimethyl-5-isopropyl-6-formylindenone (19) | >110 | >219 | UD |
Ochracenoid B (20) | >110 | >219 | UD |
Ketolactone (21) | >104 | >208 | UD |
Furospongin-1 (22) | 6.06 | 153 | 25.2 |
3β,6α,11-Trihydroxy-24-nor-9,11-seco-5α-cholest-7-en-9-one (23) | 10.7 | 59.5 | 5.56 |
(24R)-and(24S)-3β,6α,11-Trihydroxy-methyl-9,11-seco-5α-cholest-7-en-9-one (24) | >55.8 | >112 | UD |
(22E)-3β,6α,11-Trihydroxy-24-nor-9,11-seco-5α-cholesta-7,22-dien-9-one (25) | 29.9 | 59.8 | 2.00 |
3β,6α,11-Trihydroxy-9,11-seco-5α-cholest-7-en-9-one (26) | 28.6 | 57.6 | 2.01 |
3β,6α,11-Trihydroxy-9,11-seco-5α-cholesta-7,24(28)-dien-9-one (27) | >56.1 | >56.1 | UD |
(22E,24R)-3β,6α,11-trihydroxy-24-Methyl-9,11-seco-5α-cholesta-7,22-dien-9-one (28) | 44.8 | >56.1 | >1.25 |
(22E)-3β,6α,11-Trihydroxy-9,11-seco-5α-cholesta-7,22-dien-9-one (29) Subergorgol I (29) | 14.7 | 57.9 | 3.94 |
(22E)-6,11-Diacetoxy-3-hydroxy-9,11-seco-5α-cholesta-7,22-dien-9-one (30) | 6.01 | 96.8 | 16.1 |
(22E)-3,6,11-Triacetoxy-9,11-seco-5α-cholesta-7,22-dien-9-one (31) | 12.1 | 96.8 | 8.00 |
Averufin (32) | 9.27 | >136 | >14.7 |
8-O-methylnidurufin (33) | 14.4 | >126 | >8.75 |
Nidurufin (34) | >65.1 | >130 | UD |
Questinol (35) | >83.3 | >167 | UD |
ω-Hydroxyrubrocristin (36) | >79.1 | >158 | UD |
Asperinine A (37) | 30.5 | >87.7 | >2.88 |
Asperinine B (38) | 39.5 | >87.7 | >2.22 |
Rhodoptilometrin (39) | 11.9 | 159 | 13.4 |
Variecolortide C (40) | >82.9 | >82.9 | UD |
7-O-methylvariecolortide A (41) | >74.5 | >74.5 | UD |
Variecolortide B (42) | >84.9 | >84.9 | UD |
Dihydroxyisoechinulin A (43) | >118 | >118 | UD |
Echinulin (44) | >54.2 | >108 | UD |
Neoechinulin (45) | 46.4 | >155 | >3.34 |
Aspochalasin K (46) | 17.3 | >115 | >6.65 |
Aspochalasin E (47) | 32.2 | >119 | >3.70 |
Kipukasin H (48) | >61.3 | >123 | UD |
Kipukasin E (49) | >59.2 | >59.2 | UD |
Kipukasin D (50) | >59.2 | >59.2 | UD |
Diacetylkipukasin E (51) | 44.5 | >98.8 | >2.22 |
Diacetylkipukasin D (52) | >49.4 | >98.8 | UD |
Penilumamide (53) | >96.9 | >96.9 | UD |
Penilumamide D (54) | >58.8 | >58.8 | UD |
Asperpeptide A (55) | >46.6 | >46.6 | UD |
Sea-Nine 211â„¢ | 4.36 | 88.7 | 20.3 |