Pseudomonas is a genus of gram-negative gammaproteobacteria with a large range of diversity. Because of its ability to grow at low temperature, Pseudomonas is a cause of food spoilage. This bacterium is also a very common nosocomial infection of hospital patients. In this study, we investigated the effects of different natural products on Pseudomonas. The products included a polysaccharide, two flavonoids tangeretin and nobiletin and their derivatives, 5’OH-tangeretin and 5’OH-nobiletin, black tea polyphenol – theaflavins (TFs), as well as an herb named Fallopia multiflora (Chinese Knotweed). P. fluorescens and P. aeruginosa were used as model organisms. Antimicrobial effects were evaluated at various concentrations by using a microtiter plate assay or culture tube assay. The inhibition of biofilm formation was also determined using crystal violet assay. The results indicated that the selected natural products have antibacterial effect and anti-biofilm formation on Pseudomonas. Of the seven compounds studied 2.5% theaflavin, 2.5% Chinese Knotweed, and 500 μM of tangeretin showed the greatest antimicrobial effect.
","abstract_html":"<p><em>Pseudomonas</em> is a genus of gram-negative gammaproteobacteria with a large range of diversity. Because of its ability to grow at low temperature, <em>Pseudomonas</em> is a cause of food spoilage. This bacterium is also a very common nosocomial infection of hospital patients. In this study, we investigated the effects of different natural products on <em>Pseudomonas</em>. The products included a polysaccharide, two flavonoids tangeretin and nobiletin and their derivatives, 5’OH-tangeretin and 5’OH-nobiletin, black tea polyphenol – theaflavins (TFs), as well as an herb named <em>Fallopia multiflora</em> (Chinese Knotweed). <em>P. fluorescens</em> and <em>P. aeruginosa</em> were used as model organisms. Antimicrobial effects were evaluated at various concentrations by using a microtiter plate assay or culture tube assay. The inhibition of biofilm formation was also determined using crystal violet assay. The results indicated that the selected natural products have antibacterial effect and anti-biofilm formation on <em>Pseudomonas</em>. Of the seven compounds studied 2.5% theaflavin, 2.5% Chinese Knotweed, and 500 μM of tangeretin showed the greatest antimicrobial effect.</p>","abstract_has_math":false,"creators":["Bell, Margaret B."],"institution":null,"degree_name":"MS Biology","degree_level":"Thesis","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Tin-Chun Chu, Ph.D","Angela Klaus, Ph.D","Sylvia Rabacchi, Ph.D","Allan D. Blake, Ph.D.","Jane L Ko, Ph.D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-05-17T07:00:00Z","date_published":"2014-05-17T07:00:00Z","updated_at":"2026-07-24T04:32:52Z","subjects":["Pseudomonas","antibacterial","natural products","polyphenolic compounds","biofilm","Alternative and Complementary Medicine","Microbiology"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarship.shu.edu/dissertations/1983","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tin-Chun Chu, Ph.D","Angela Klaus, Ph.D","Sylvia Rabacchi, Ph.D","Allan D. Blake, Ph.D.","Jane L Ko, Ph.D."]},{"key":"dc:creator","label":"Author","values":["Bell, Margaret B."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2014-05-14T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["MS Biology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Pseudomonas","antibacterial","natural products","polyphenolic compounds","biofilm","Alternative and Complementary Medicine","Microbiology"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarship.shu.edu/dissertations/1983"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Pseudomonas is a genus of gram-negative gammaproteobacteria with a large range of diversity. Because of its ability to grow at low temperature, Pseudomonas is a cause of food spoilage. This bacterium is also a very common nosocomial infection of hospital patients. In this study, we investigated the effects of different natural products on Pseudomonas. The products included a polysaccharide, two flavonoids tangeretin and nobiletin and their derivatives, 5’OH-tangeretin and 5’OH-nobiletin, black tea polyphenol – theaflavins (TFs), as well as an herb named Fallopia multiflora (Chinese Knotweed). P. fluorescens and P. aeruginosa were used as model organisms. Antimicrobial effects were evaluated at various concentrations by using a microtiter plate assay or culture tube assay. The inhibition of biofilm formation was also determined using crystal violet assay. The results indicated that the selected natural products have antibacterial effect and anti-biofilm formation on Pseudomonas. Of the seven compounds studied 2.5% theaflavin, 2.5% Chinese Knotweed, and 500 μM of tangeretin showed the greatest antimicrobial effect.
"]},{"key":"dc:title","label":"Title","values":["The Use of Natural Products as Potential Anti-Pseudomonas Agents"]}]}],"canonical_facts":{"dc:contributor":["Tin-Chun Chu, Ph.D","Angela Klaus, Ph.D","Sylvia Rabacchi, Ph.D","Allan D. Blake, Ph.D.","Jane L Ko, Ph.D."],"dc:creator":["Bell, Margaret B."],"dc:date.available":["2014-05-14T07:00:00Z"],"dc:description.abstract":["Pseudomonas is a genus of gram-negative gammaproteobacteria with a large range of diversity. Because of its ability to grow at low temperature, Pseudomonas is a cause of food spoilage. This bacterium is also a very common nosocomial infection of hospital patients. In this study, we investigated the effects of different natural products on Pseudomonas. The products included a polysaccharide, two flavonoids tangeretin and nobiletin and their derivatives, 5’OH-tangeretin and 5’OH-nobiletin, black tea polyphenol – theaflavins (TFs), as well as an herb named Fallopia multiflora (Chinese Knotweed). P. fluorescens and P. aeruginosa were used as model organisms. Antimicrobial effects were evaluated at various concentrations by using a microtiter plate assay or culture tube assay. The inhibition of biofilm formation was also determined using crystal violet assay. The results indicated that the selected natural products have antibacterial effect and anti-biofilm formation on Pseudomonas. Of the seven compounds studied 2.5% theaflavin, 2.5% Chinese Knotweed, and 500 μM of tangeretin showed the greatest antimicrobial effect.
"],"dc:identifier":["https://scholarship.shu.edu/dissertations/1983"],"dc:subject":["Pseudomonas","antibacterial","natural products","polyphenolic compounds","biofilm","Alternative and Complementary Medicine","Microbiology"],"dc:title":["The Use of Natural Products as Potential Anti-Pseudomonas Agents"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["MS Biology"]},"updated_at":"2026-07-24T04:32:52Z"}