Synthesis, characterization and comparative study of nano-Ag–TiO2 against Gram-positive and Gram-negative bacteria under fluorescent light

Barudin, Nur Hidayati Ahmad; Sreekantan, Srimala; Ong, Ming Thong; Lai, Chin Wei

doi:10.1016/j.foodcont.2014.05.046

Cited by 27 publications

(21 citation statements)

References 33 publications

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“…The collected cells were fixed with 2.5% glutaraldehyde at 4°C for 24 h, then washed three times with PBS. After eliminating solution, the dehydration process was conducted with 30, 50, 70, 80, and 95% of alcohol for 15 min each step, and 100% of alcohol for two times ( Ahmad Barudin et al, 2014 ). After freeze drying for 12 h in the vacuum freeze dryer (Lyoquest-55, Azbil Telstar Technologies S.L.U.…”

Section: Methodsmentioning

confidence: 99%

Different Growth Promoting Effects of Endophytic Bacteria on Invasive and Native Clonal Plants

Dai

Wan

et al. 2016

Front. Plant Sci.

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The role of the interactions between endophytes and alien plants has been unclear yet in plant invasion. We used a completely germ-free culture system to quantify the plant growth-promoting (PGP) effects of endophytic bacteria Bacillus sp. on aseptic seedlings of Wedelia trilobata and of its native clonal congener W. chinensis. The endophytic bacteria did not affect the growth of W. chinensis, but they significantly promoted the growth of W. trilobata. With the PGP effects of endophytic bacteria, relative change ratios of the clonal traits and the ramets’ growth traits of W. trilobata were significantly greater than those of W. chinensis. Our results indicate that the growth-promoting effects of endophytes may differ between invasive and native clonal plants, and the endophytes of invasive plant may be host-specific to facilitate plant invasion.

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Section: Methodsmentioning

confidence: 99%

Different Growth Promoting Effects of Endophytic Bacteria on Invasive and Native Clonal Plants

Dai

Wan

et al. 2016

Front. Plant Sci.

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“…Struktur dinding sel bakteri Gram-negatif relatif lebih kompleks dan berlapis tiga, yaitu lapisan luar berupa lipoprotein, lapisan tengah berupa lipopolisakarida, dan lapisan dalam berupa peptidoglikan seperti ditunjukkan pada Gambar 2. (Barudin et al, 2014;Malanovic dan Lohner, 2016). Perbedaan struktur dinding sel menentukan penetrasi, ikatan dan aktivitas senyawa antibakteri (Brooks et al, 2003).…”

Section: Senyawa Aktif Ekstrak Antimikroba Dari Mikroalga T Chuii Deunclassified

Production and Identification of Antimicrobial Compounds from Microalgae Tetraselmis chuii with Ultrasound Assisted Extraction Method (Study Type of Solvent and Total Cycle Extraction)

Maligan

Adhianata

Zubaidah

2016

JTP

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Pada ekosistem air, mikroalga merupakan penghasil alami energi dan senyawa metabolit potensial. Mikroalga ekstraseluler memiliki fungsi sebagai penghambat dan memicu pertumbuhan senyawa. Tetraselmis chuii memiliki komponen bioaktif seperti asam lemak dan ester yang digunakan sebagai agen antibakteri. Antimikroba adalah senyawa yang dapat menghambat pertumbuhan mikroba. Proses ekstraksi dipengaruhi oleh metode ekstraksi, berbagai pelarut, dan kondisi ekstraksi. Tujuan penelitian ini adalah untuk mendapatkan informasi tentang penggunaan berbagai pelarut dan ekstraksi siklus total terhadap hasil ekstrak Tetraselmis chuii, mengetahui aktivitas antimikroba ekstrak Tetraselmis chuii terhadap S. aureus, E. coli, A. flavus dan C. Albicans, dan mengidentifikasi senyawa bioaktif ekstrak Tetraselmis chuii yang bertindak sebagai agen antimikroba dengan menggunakan metode GC-MS. Hasil penelitian menunjukkan bahwa rendemen tertinggi dihasilkan dari pelarut aseton pada 3 siklus ekstraksi, yaitu sebesar 35.19%. Uji aktivitas antimikroba terbaik menghasilkan ekstrak dari pelarut kloroform dengan ekstraksi 3 siklus dengan diameter zona hambatan 16.43 mm pada S.aureus, 16.07 mm pada E. coli, 15.46 mm di C. albicans, dan 15.8 mm di A.flavus. Senyawa bioaktif dari ekstrak Tetraselmis chuii berpotensi sebagai senyawa antimikroba, termasuk asam lemak, ester, alkohol, keton, benzene, dan alkana

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“…However, this does not always happen, for example, in bacteria it is difficult to establish if the cells are dead or not [32]. The morphological changes in each membrane, nucleus or organelle could be easily evaluated and increase the photocatalytic effect [31,32,181,182,183]. Transmission electron microscopy is the most complete structural analysis, but it also requires more expertise and time.…”

Section: Bacteriamentioning

confidence: 99%

“…In general, the photocatalytic mechanism begins with a nanomaterial attached to the algae and this physical obstruction by the nanoparticles could avoid the flow of nutrients [181,182,184], see Fig 8. Aa,Ac. In general, the photocatalytic mechanism begins with a nanomaterial attached to the algae and this physical obstruction by the nanoparticles could avoid the flow of nutrients [181,182,184], see Fig 8. Aa,Ac.…”

Section: Algaementioning

confidence: 99%

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An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

Rodríguez-González

Obregón

Patrón-Soberano

et al. 2020

Applied Catalysis B: Environmental

148

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J o u r n a l P r e -p r o o f 2 Graphical Abstract Highlights  Photoactive TiO2 nanomaterials can solve the actual microbial infectious defies  The microbial cell/TiO2 surface approach is key to get the photo-kill mechanism  Microbial preparation requires a reproducible protocol for proper characterization  Advanced surface characterization techniques can unravel the photo-kill mechanism  Generation of ROS, physical injuries and biocidal features confirm the annihilation J o u r n a l P r e -p r o o f Abstract The approach of this timely review considers the current literature that is focused on the interface nanostructure/cell-wall microorganism to understand the annihilation mechanism. Morphological studies use optical and electronic microscopes to determine the physical damage on the cell-wall and the possible cell lysis that confirms the viability and microorganism death. The key parameters of the tailoring the surface of the photoactive nanostructures such as the metal functionalization with bacteriostatic properties, hydrophilicity, textural porosity, morphology and the formation of heterojunction systems, can achieve the effective eradication of the microorganisms under natural conditions, ranging from practical to applications in environment, agriculture, and so on. However, to our knowledge, a comprehensive review of the microorganism/nanomaterial interface approach has rarely been conducted. The final remarks point the ideal photocatalytic way for the effective prevention/eradication of microorganisms, considering the resistance that the microorganism could develop without the appropriate regulatory aspects for human and ecosystem safety. Introduction and background 1. TiO 2 based materials obtained from TiO 2 and its composites J o u r n a l P r e -p r o o f previous studies have demonstrated that photocatalysis can be considered a promising tool in anticancer therapies, since the photocatalyst can kill cancer cells such as HeLa cells, which cause cervical cancer [7]. The energy absorbed by the photocatalyst comprises the range of ultraviolet and/or visible light, even natural sunlight. When the photocatalyst absorbs light, if the energy of the photons is enough to excite the electrons J o u r n a l P r e -p r o o f 6in the valence band (VB), then they migrate to a higher energy level in the conduction band (CB) of the material, as it is illustrated in Fig. 1. This phenomenon generates the charge carriers known as hole-electron pairs. The photogenerated hole can migrate to the surface of the material and react with water molecules or hydroxyl ions to produce hydroxyl radicals, while the photoexcited electron in the conduction band can react with the adsorbed molecular oxygen to produce superoxide ions [8]. Since the report of Fujishima and Honda about the water splitting process using a TiO2 electrode under UV irradiation, numerous studies have exploited the photoactive properties of this material [9,10]. Several reviews have studied the relationship between the electronic properties of TiO2 with...

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Synthesis, characterization and comparative study of nano-Ag–TiO2 against Gram-positive and Gram-negative bacteria under fluorescent light

Cited by 27 publications

References 33 publications

Different Growth Promoting Effects of Endophytic Bacteria on Invasive and Native Clonal Plants

Different Growth Promoting Effects of Endophytic Bacteria on Invasive and Native Clonal Plants

Production and Identification of Antimicrobial Compounds from Microalgae Tetraselmis chuii with Ultrasound Assisted Extraction Method (Study Type of Solvent and Total Cycle Extraction)

An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

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