Antibacterial and insecticidal activity of volatile compounds of three algae species of Oman Sea

Abstract

Many of the volatile oils showed important biological and pharmacological activities, these compounds as part of the traditional medicine in many cultures used as long time. Potencies of them caused these natural products gained many scientific researches in felid of natural products. The volatile oils of Actinotrichia fragilis (Forsskål) Børgesen, Liagora ceranoides J.V.Lamouroux and Colpomenia sinuosa (Mertens ex Roth) Derbes and. Solier were extracted by hydrodistillation. These volatile oils were analyzed by GC-MS and GC-FID techniques and tested for their toxicity against Oryzeaphilus mercator and Tribolium castaneum, antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus using by the disc diffusion method also free-radical-scavenging properties. The identified constituents of these volatile oils represented 92.7%, 99.9% and 93.8% of the total volatile oils, respectively, of A. fragilis, L. ceranoides and C. sinuosa. Ethyl cinnamate and Tetradecane were the main compounds in L. ceranoides, 1dodecanol and caryophyllene oxide in A. fragilis whilst hexadecane and 7-pentadecanone were the principal components of C. sinuosa volatile oil. All three volatile oils showed 55-90% mortality of O. mercator and 60-80% mortality of T. castaneum at a dose of 12 μL/L air after 48h of exposure. Based on the observed contact toxicity of the essential oils of these species, it is fair to state that these volatile oils may have some potential as an insecticide against the crop pests, O. mercator and T. castaneum. Also antibacterial activity of L. ceranoides volatile oil against Pseudomonas aeruginosa and Staphylococcus aureus is significant.

Fillet Fish Fortified with Algal Extracts of Codium tomentosum and Actinotrichia fragilis, as a Potential Antibacterial and Antioxidant Food Supplement

“…Antibacterial activity of C. intricatum extract in opposition to S. aureus and MRSA is similar to that reported from methanol extracts of Codium species (C. tomentosum, C. tomentosum, C. dichotomum and C. fragile), where high inhibitory activity was noted [45]. Pasdaran et al [10] reported the antibacterial activity of A. fragilis volatile oil against Pseudomonas aeruginosa, E. coli and Staphylococcus aureus. Salem et al [49] reported the antibacterial activity of A. fragilis extracts against E. coli, S. aureus, E. feacalis, Salmonella sp., B. cereus and P. aeruginosa.…”

“…Recently, due to the resistance of different pathogenic bacteria and pests to antibiotics and insecticidal agents, finding new active components against these health and environmental problems is one of the major areas of medical and agricultural research. The peculiarity of the marine environment and the high biological activity of marine natural products make algal metabolites a fascinating source for finding new antimicrobial and insecticidal compound [10][11][12].…”

Algae and Their Metabolites as Potential Bio-Pesticides

“…The volatile oils from Actinotrichia fragilis, Liagora ceranoides, and Colpomenia sinuosa were hydrodistilled and contained different aliphatic alcohols and long-chain hydrocarbons as the major components. They caused 55-90% and 60-80% mortality to pests of stored products Oryzaephilus mercator and Tribolium castaneum, respectively, at a dose of 12 µL/L air after 48 h of fumigation exposure [119].…”

“…The volatile oils of A. fragilis caused 80-90% mortality in both T. castaneum and O. mercator and consisted of 49% aliphatic alcohols, mainly 1-dodecanol (39.6%) [119]. The insecticidal activity of 1-dodecanol was suggested to be related to the developing cuticle, producing a disruption in the cuticular tanning process [120].…”