Antimicrobial Properties of Grape Fruit, Pawpaw and Black Pepper Extracts on Organisms associated with Fish Spoilage

Abstract

On average, Nigeria loses 30-0% of its fi sh harvest to spoilage. This exacerbates her fi sh demandsupply gap; hence the need to devise means of miti gati ng the spoilage. This paper reports the fi ndings of a study that delved into the anti microbial properti es of Grape Fruit (Citrus paradisa), Pawpaw (Carica papaya) and Black Pepper (Piper guineese) extracts on organisms associated with fi sh spoilage. In the study, the anti microbial eff ect of fi ve concentrati ons (0.1, 0.2., 0.3, 0.4 and 0.g/ml) of ethanolic, cold and hot water extracts of these plants on spoilage organisms associated with catf ish (Clarias gariepinus) were assessed, through measuring inhibiti on zones, using the cup plate diff usion method. The inhibiti on zones were found to signifi cantly diff er, across extracti on method; plant material and extract concentrati on. Hot water was found to be the best extracti on method, with a mean inhibiti on zone of 4.42 + 0.38mm; followed by ethanolic and cold water methods, with 3. + 0.mm and 0.0 + 0.1mm respecti vely. Among the plant materials, grape peel had the best anti microbial acti vity, with a mean inhibiti on zone of 3.70 + 0.40mm against the eleven microorganisms tested, followed by black pepper (2.68 + 0.2mm) and then pawpaw seed (2.1 + 0.32mm).

In vitro antibacterial activity of Rumex nervosus and Clematis simensis plants against some bacterial human pathogens

“…In the present study, among the solvents used to extract the biologically active substances from two medicinal plants, ethanol and methanol were the best solvents, followed by acetone and least by diethyl ether and hexane (Tables 2 to 5). This specified that the extraction of medicinal plants with different solvents may produce different in vitro inhibitory result which based on the potential of the solvents used to extract the biologically active constituents (George et al, 2010). The methanol and ethanol leaf extracts of R. nervosus showed significant antibacterial activity against most of bacterial human pathogens evaluated in the present study.…”

In Vitro Antibacterial Activity of Rumex nervosus and Clematis simensis Plants Against Some Bacterial Human Pathogens

“…In the present study, among the solvents used to extract the biologically active substances from two medicinal plants, ethanol and methanol were the best solvents, followed by acetone and least by diethyl ether and hexane (Table 2 to 5). This specified that the extraction of medicinal plants with different solvents may produce different in vitro inhibitory result which based on the potential of the solvents used to extract the biologically active constituents (George et al, 2010). The methanol and ethanol leaf extracts of Rumex nervosus showed significant antibacterial activity against most of bacterial human pathogens evaluated in the present study.…”

In-Vitro Antibacterial Activity of Ruta Chalepensis (Tenadam) and Justicia Shimperiana(Senel) Plants against Some Bacterial Human Pathogens

“…In these studies, among the solvents used to extract the biologically active substances from two medicinal plants, ethanol and methanol were the best solvents; followed by acetone and least by diethyl ether and hexane (Table 1). So, this displayed that the extraction of medicinal plants with different solvents may show different result which based on the potential of the solvents used to extract the biologically active constituents (George et al, 2010). In the present study, ethanol and methanol crude leaves extracts of J. shimperna and R. chalepensis showed the strongest activity against E. coli, S. aureus, S. typhi, and S. dysentry compared with other three solvents and plant based products have been effectively proven for their utilization as source for antimicrobial compounds.…”