Antibacterial Activity of Three Algal Genera against some Pathogenic Bacteria

Abstract

In the current study, three types of algae namely Tetradesmus nygaardi (MZ801740), Scenedesmus quadricauda (MZ801741) and Coelastrella sp (MZ801742) were extracted by 95% ethanol and hexane against two types of gram positive and two types of gram negative bacteria by wells diffusion methods. Eleven concentrations from the extract of algae (2,5,10,15,20,25, 30, 35, 40, 45 and 50 mg/ml) were utilized. It was noticed that ethanolic extraction was more effective than hexane in Scenedesmus quadricauda than the two other mentioned algal species against all pathogenic bacteria, Acintobacter baumanii (ATCC: 19606), Klebsiella pneumonia (ATCC: 13883) Enterococcus faecalis (ATCC: 29212) and Staphylococcus aureus (ATCC: 14028). In addition to that, extraction of Tetradesmus nygaardi by hexane was more effective than ethanol against all studied pathogenic bacteria. Extract of Coelastrella sp by Ethanol showed weak effect against all pathogenic bacteria compared with the other types of algae. Many chemical compounds which possess antibacterial activities were obtained through analyzing the extraction of algae by gas chromatography-mass spectrometry (GC-MS

Microbiological and Analytical Evaluation of Semi-Solid Formulations of Doxycycline Hyclate under Accelerated Stability Conditionsand analytical evaluation of semi-solid formulations of Doxycycline Hyclate under accelerated stability conditions

“…The Agar well diffusion method was used to screen the antibacterial activity of semi-solid formulations against two types of bacteria, which are Grampositive bacteria (Staphylococcus aureus) and Gramnegative bacteria (Pseudomonas Aeruginosa) 18,19 . Bacterial suspensions were pre-cultured in Mueller Hinton broth (MHB) overnight in a rotary shaker at 37°C.…”

Evaluation of Antibiofilm and Cytotoxic Activity of Microalgae Isolated from Different Sites of betwata- Erbil/Iraq

“…Therefore, it may be speculated that they are safe to use many purposes including antioxidant source. Algae have been shown to contain large amounts of cytotoxic substances with anticancer, antitumor, antiproliferative, and antimetastatic characteristics such fucoidans, laminarians, and terpenoids 26,27 . In a study done by 28,29 , it was found that the viability of cells decreased as extract concentrations increase.…”

Antibacterial Efficacy of 940 nm Diode Laser against Cariogenic Bacteria (Tooth Decay-causing Bacteria)

“…In some of the studies, additional disinfectant solutions were also assessed 8 . There are numerous techniques to lower the prevalence of dental caries, such as fluoride and chemical antibacterial agents, although they are not always highly efficient and may have negative side effects 9, 10 or the bacteria may develop a resistance to this antibacterial agent, there has been an obvious increase in the percentage of bacterial pathogens that are resistant to numerous antibacterial agents 11 due to inappropriate utilization and widespread consumption of antibiotics 12 . As a result, various antibacterial methods have a good bactericidal effect and do not have any negative side effects are required such as lasers.…”