The antibacterial activity of chloroform extract of four seaweeds against seven bacterial strains was presented in Table-1. The zone of inhibition ranged between 8.8-1.23mm. The maximum activity (8.8mm) was recorded from the extract of G. edulis against S. aureus and minimum (1.23mm) by U. lactuca against P. aeruginosa. In the present investigation, higher activity was recorded from the red alga G. edulis followed by the brown alga S. wightii. It has been very well established by several scientific teams that seaweeds belonging to red, brown and green algae exhibited inhibitory action against
both Gram positive and Gram negative bacteria. the present study, highest antibacterial activity was noted in brown alga, similarly [18] noted highest antibacterial activity in Rhodophyta. Antibacterial activity of nine species of seaweeds belonging to brown, red and green algae revealed that red and brown seaweeds had greater antibacterial activity than the green algae [12]. But [19] has reported that the brown algal extracts showed higher activity than the extracts of red algae. But in the present investigation the red alga showed higher activity than the brown algae and green alga. There was no inhibitory effect from U. lactuca extract against S. paratyphi and K. pneumoniae, S. wightii extract against S. aureus and P. aeruginosa and P. gymnospora extract against S. dysenteriae. G. edulis was the only seaweed active against all the tested pathogens. This may be due to active components which are present in plant extracts. However, some plant extracts were unable to exhibit antibacterial activity against tested bacterial strains. As suggested by [20]these bacterial strains may have some kind of resistance mechanisms e.g. enzymatic inactivation, target sites modification and decrease intracellular drug accumulation or the concentration of the compound used may not be sufficient. Brown algae show higher degrees of antibacterial activity rather than extracts obtained from red and green algae [21] which is in contrast to the present investigation. Thus these seaweeds could be utilized effectively in product preparation for the beneficial of mankind. Further research studies are being carried out on the other species of seaweeds from the same habitat in order to provide complete data on the nutritive and antimicrobial potential of these plants.
การต้านแบคทีเรียของสารสกัดคลอโรฟอร์มของสาหร่ายทะเล 4 กับสายพันธุ์แบคทีเรียที่เจ็ดแสดงไว้ในตารางที่ 1 โซนยับยั้งอยู่ระหว่าง 8.8-1.23 mm กิจกรรมสูงสุด (8.8 มิลลิเมตร) บันทึกจากสารสกัดของ edulis G. S. หมอเทศข้างลายและต่ำสุด (1.23 mm) โดย lactuca U. กับ P. aeruginosa ในการสืบสวนสอบสวนที่นำเสนอ กิจกรรมสูงถูกบันทึกจาก alga แดง G. edulis ตาม ด้วย wightii S. alga น้ำตาล มันดีก่อตั้ง โดยทีมงานทางวิทยาศาสตร์ต่าง ๆ ว่า เป็นของแดงสาหร่ายทะเล สาหร่ายสีน้ำตาล และสีเขียวแสดง inhibitory ดำเนินการกับ both Gram positive and Gram negative bacteria. the present study, highest antibacterial activity was noted in brown alga, similarly [18] noted highest antibacterial activity in Rhodophyta. Antibacterial activity of nine species of seaweeds belonging to brown, red and green algae revealed that red and brown seaweeds had greater antibacterial activity than the green algae [12]. But [19] has reported that the brown algal extracts showed higher activity than the extracts of red algae. But in the present investigation the red alga showed higher activity than the brown algae and green alga. There was no inhibitory effect from U. lactuca extract against S. paratyphi and K. pneumoniae, S. wightii extract against S. aureus and P. aeruginosa and P. gymnospora extract against S. dysenteriae. G. edulis was the only seaweed active against all the tested pathogens. This may be due to active components which are present in plant extracts. However, some plant extracts were unable to exhibit antibacterial activity against tested bacterial strains. As suggested by [20]these bacterial strains may have some kind of resistance mechanisms e.g. enzymatic inactivation, target sites modification and decrease intracellular drug accumulation or the concentration of the compound used may not be sufficient. Brown algae show higher degrees of antibacterial activity rather than extracts obtained from red and green algae [21] which is in contrast to the present investigation. Thus these seaweeds could be utilized effectively in product preparation for the beneficial of mankind. Further research studies are being carried out on the other species of seaweeds from the same habitat in order to provide complete data on the nutritive and antimicrobial potential of these plants.
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