scholarly journals A Mechanistic View of the Light-Induced Synthesis of Silver Nanoparticles Using Extracellular Polymeric Substances of Chlamydomonas reinhardtii

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3506 ◽  
Author(s):  
Ashiqur Rahman ◽  
Shishir Kumar ◽  
Adarsh Bafana ◽  
Julia Lin ◽  
Si Amar Dahoumane ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Chlamydomonas Reinhardtii ◽  
Production Rate ◽  
Functional Groups ◽  
Extracellular Polymeric Substances ◽  
Synthesis Process ◽  
The Media ◽  
Mechanistic View

In the current study, extracellular polymeric substances (EPS) of Chlamydomonas reinhardtii and photon energy biosynthetically converted Ag+ to silver nanoparticles (AgNPs). The reaction mechanism began with the non-photon-dependent adsorption of Ag+ to EPS biomolecules. An electron from the EPS biomolecules was then donated to reduce Ag+ to Ag0, while a simultaneous release of H+ acidified the reaction mixture. The acidification of the media and production rate of AgNPs increased with increasing light intensity, indicating the light-dependent nature of the AgNP synthesis process. In addition, the extent of Ag+ disappearance from the aqueous phase and the AgNP production rate were both dependent on the quantity of EPS in the reaction mixture, indicating Ag+ adsorption to EPS as an important step in AgNP production. Following the reaction, stabilization of the NPs took place as a function of EPS concentration. The shifts in the intensities and positions of the functional groups, detected by Fourier-transform infrared spectroscopy (FTIR), indicated the potential functional groups in the EPS that reduced Ag+, capped Ag0, and produced stable AgNPs. Based on these findings, a hypothetic three-step, EPS-mediated biosynthesis mechanism, which includes a light-independent adsorption of Ag+, a light-dependent reduction of Ag+ to Ag0, and an EPS concentration-dependent stabilization of Ag0 to AgNPs, has been proposed.

AlCl3·XNaCl Complex Compound as Catalyst Synthesis Dichlorophenylphosphine

2013 ◽  
Vol 641-642 ◽  
pp. 128-131 ◽  
Author(s):  
Tian Bo Fan ◽  
Gui Qi An ◽  
Tao Tang ◽  
Yun Yi Lui ◽  
Xiao Han ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Production Rate ◽  
Complex Compound ◽  
Industrial Production ◽  
Raw Materials ◽  
Reference Value ◽  
Raw Material ◽  
Catalyst Synthesis ◽  
Catalyst Amount

Dichlorophenylphosphine(DCPP) was prepared by the catalyst of AlCl3·XNaCl complex using C6H6, PCl3as raw materials. The influences of the catalyst amount, raw material ratio and the choice of extractant on the production rate were studied, as well as the recycling of the catalyst. Fourier transform infrared spectroscopy was employed to characterize the products. The results show that the products by experiments were dichlorophenylphosphine(DCPP). All above have some reference value for the industrial production.

scholarly journals Phytochemical Screening, Spectrum Profile of Functional Groups, and Effervescent Formulation of Kepok Banana Peels Stem Extract

2021 ◽  
Vol 4 (2) ◽  
pp. 66-72
Author(s):  
Robby Candra Purnama ◽  
Annisa Primadiamanti
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Secondary Metabolites ◽  
Functional Groups ◽  
Functional Group ◽  
Screening Method ◽  
Phytochemical Screening ◽  
Stem Extract ◽  
Group Profile ◽  
Banana Stem

Kepok banana plants contain secondary metabolites such as tannins and flavonoids. Tannins and flavonoids have various properties for human health. Research has been carried out to identify secondary metabolite compounds (tannins, flavonoids, and saponins) by using the phytochemical screening method to see the functional group profile contained in the extract of kepok banana stem waste. Kepok banana stem waste was extracted in 96% ethanol, then evaporated and screened phytochemically. This extract was used to prepare effervescently. Screening results showed that tannin and flavonoids were identified by the appearance of the following color black-green and dark red, respectively. Meanwhile, saponins were negative because the foam formed had a height of 0.3 cm and did not meet the saponins' positive requirements (1-3 cm high foam and stable for 5 minutes). Identification of functional groups in the extract of kepok banana stem waste using Fourier-transform Infrared Spectroscopy (FTIR) showed that C-C stretching in the area 2927.24 cm-1, O-H stretching in the 3423.87 cm-1 area, C=O stretching in the 1648.87 cm-1 area. Also appeared bending CH2 in the region of 1421.45 cm-1, and C-C in the area of 1149.98 cm-1. The characteristics of three different formulas (A, B, and C) of effervescent have been investigated: the moisture content of 2.51%; 2.55%, and 2.52%, respectively. Then, flow rate of 8.81 g/s; 8.83 g/s; and 8.82 g/s, compressibility of 14.5%; 14.4%; and 14.5%, and a pH of 5.97; 5.98; and 5.97 respectively. All parameters are eligible.

scholarly journals Optimasi Penambahan Gliserol sebagai Plasticizer pada Sintesis Plastik Biodegradable dari Limbah Nata de Coco dengan Metode Inversi Fasa

2020 ◽  
Vol 4 (2) ◽  
pp. 96
Author(s):  
Claudia Candra Setyaningrum ◽  
Kholisoh Hayati ◽  
Siti Fatimah
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Solid Waste ◽  
Fourier Transform Infrared Spectroscopy ◽  
Functional Groups ◽  
Testing Machine ◽  
Fourier Transform Infrared ◽  
Biodegradable Plastics ◽  
Biodegradable Plastic ◽  
Universal Testing

Limbah nata de coco merupakan nata yang tidak dapat dijadikan sebagai produk setelah proses sortasi sehingga menghasilkan limbah padat dan jarang dimanfaatkan. Kandungan selulosa pada limbah padat nata de coco sebesar 42,57%. Tujuan penelitian ini membuat plastik biodegradable dengan hasil limbah nata de coco dengan penambahan plasticizer. Metode yang digunakan pada pembuatan plastik biodegradable ini adalah metode inversi fasa dengan variasi berat selulosa 2%; 2,5%; dan 3% (b/v), variasi volume gliserol sebesar 2%, 3%, dan 5% (v/v), dan penambahan kitosan sebagai penguat. Karakteristik pastik biodegradable diuji menggunakan UTM (Universal Testing Machine) dan FTIR (Fourier-Transform Infrared Spectroscopy). Plastik biodegradable yang dihasilkan dari berbagai perbandingan berat selulosa dan volume gliserol memiliki karakteristik yang berbeda-beda. Plastik biodegradable dengan karakteristik optimal memiliki nilai kuat tarik optimal sebesar 4,34 MPa, nilai elongasi optimal sebesar 4,44% dan nilai ketahanan air optimal sebesar 65,20%. Pada analisis gugus fungsi menggunakan FTIR menunjukkan tidak ditemukan adanya gugus fungsi baru dalam plastik biodegradable selain gugus fungsi bahan pembentuknya. Pada uji biodegradabilitas, diperoleh nilai biodegradabilitas sebesar 80% – 100% setelah ditimbun di dalam tanah selama 14 hari.Nata de coco waste is nata that cannot be used as a product after the sorting process so that it produces solid waste and is rarely utilized. The cellulose content in nata de coco solid waste is 42.57%, the purpose of this study is to make biodegradable plastic with the results of nata de coco waste by adding plasticizers. The method used in the manufacture of biodegradable plastics is the phase inversion method with cellulose weight variation; 2%; 2.5%; and 3% (w / v), variations in the volume of glycerol by 2%, 3%, and 5% (v/v), and the addition of chitosan as an amplifier. The biodegradable plastic characteristics were tested using UTM (Universal Testing Machine) and FTIR (Fourier-Transform Infrared Spectroscopy). Biodegradable plastics that are produced from various weight cellulose and glycerol volume ratios have different characteristics. Biodegradable plastic with optimal characteristics has an optimal tensile strength value of 4.34 MPa, optimal elongation value of 4.44% and an optimal water resistance value of 65.20%. In the analysis of functional groups (FTIR) no new functional groups were found in biodegradable plastics in addition to the functional groups forming materials. In the biodegradability test, a biodegradability value of 80% - 100% is obtained after being buried in the ground for 14 days.

scholarly journals BIOGENIC SYNTHESIS OF SILVER NANOPARTICLES USING MANILKARA HEXANDRA (ROXB.) DUBARD STEM BARK EXTRACT AND IT’S PHYSICAL, CHEMICAL CHARACTERIZATION AND PHARMACEUTICAL EVALUATION

2019 ◽  
pp. 79-88
Author(s):  
A ANTONY LAWRENCE ◽  
J THOMAS JOSEPH PRAKASH
Keyword(s):  
Silver Nanoparticles ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Stem Bark ◽  
Diffusion Method ◽  
Bark Extract ◽  
Stem Bark Extract ◽  
Uv Visible

Objective: The present study was to synthesize nanoparticles using Manilkara hexandra stem bark extract its characterization and evaluating it by an antimicrobial and antioxidant assay. Methods: Manilkara hexandra stem bark silver nanoparticles (MHSB-AgNPs) was done by mixing silver nitrate (1 mmol) and aqueous stem bark extract and it was analyzed by UV-Visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), Zeta potential, Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Spectroscopy (EDAX), Thermogravimetry/Differential Thermal Analysis (TG/DTA) and Differential scanning calorimetry (DSC). The antibacterial assay was done by a well diffusion method and also examined for antifungal assay was done by disk diffusion method and antioxidant potential Diphenyl-1-picryl hydrazyl (DPPH method) Results: Manilkara hexandra stem bark silver nanoparticles (MHSB-AgNPs) is characterized by various techniques such as UV-visible absorption spectrum ranges from 430 nm to 440 nm indicate silver nanoparticles. The Fourier Transform Infrared Spectroscopy consists of biomolecules acts as capping agent to form silver nanoparticles. Field Emission Scanning Electron Microscopy shows particle size ranges from 15 nm to 50 nm. Energy Dispersive Spectroscopy shows the presence of Silver. X-ray Diffraction corresponds to face-centered lattice planes (111), (200), (220) and (311). Dynamic Light Scattering show the range of 68 nm and Zeta potential show the negative value of-17 nm which has high stability. Silver nanoparticles is also examined by Thermogravimetry/Differential Thermal Analysis (TG/DTA) and Differential scanning calorimetry (DSC) this project the thermal stability of the nanoparticles. The aqueous stem bark is also examined by UV-visible absorption spectrum, Fourier Transform Infrared Spectroscopy (FTIR), and Gas Chromatography-Mass Spectrometry (GCMS). In GCMS 20 compounds were identified. Silver nanoparticles show high zone of inhibition in antimicrobial assays and act as a good antioxidant agent. Conclusion: It is eco-friendly, non-toxic, and it’s easy to synthesis and it shows good result in an antimicrobial and antioxidant assay can be applied in a pharmaceutical application.

Study of Ionic Liquids (AIL and PIL) Viscosity and its Functional Groups under Heat Treatment on Cutting Tool Surface Using Fourier-Transform Infrared Spectroscopy (FTIR)

2020 ◽  
Vol 981 ◽  
pp. 98-103
Author(s):  
Mona Alis Md. Yasser ◽  
Zaidi Embong ◽  
Erween Abdul Rahim ◽  
Amiril Sahab Abdullah Sani ◽  
Kamaruddin Kamdani
Keyword(s):  
Heat Treatment ◽  
Ionic Liquid ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Functional Groups ◽  
Cutting Tool ◽  
Fourier Transform Infrared ◽  
Nitrile Group ◽  
Tool Surface

This study was conducted to investigate the efficiency of Minimum Quantity Lubrication (MQL) technique by using Modified Jatropha Oil (MJO) bio-based lubricant with the presence of 10% Ammonium Ionic Liquid (MJO+AIL10%) and 1% Phosphonium Ionic Liquid (MJO+PIL1%) additives respectively at various temperature of 200 °C, 300 °C and 400 °C heat treatment to determine the ability to exhibit corrosion and wear throughout the process. Fourier-Transform Infrared Spectroscopy (FTIR) analysis revealed prominent peaks of functional groups in these bio-lubricants; esters (C-O) and (C=O), alkanes (C-H), hydroxide (O-H), and nitrile groups deposited on the cutting tool surface. Initially, nitrile group is detected on cutting tool surface without lubricants at 2200 to 2300 absorption band reduced to lower intensity and most likely concealed by MJO+AIL10% compared to MJO+PIL1% where the nitrile group remains reflected in FTIR spectrum. In this work, it is proved that MJO+AIL10% has higher viscosity as compared to MJO+PIL1%. in the context of functional groups and supported the previous study on MJO+AIL10% as corrosion inhibitor.

scholarly journals Extracellular Biofabrication, Characterization, and Antimicrobial Efficacy of Silver Nanoparticles Loaded on Cotton Fabrics Using Newly IsolatedStreptomycessp. SSHH-1E

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Noura El-Ahmady El-Naggar ◽  
Attiya Mohamedin ◽  
Sarah Shawqi Hamza ◽  
Abdel-Dayem Sherief
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Cell Free Supernatant ◽  
Transmission Electron ◽  
Vis Spectroscopy

Biological method for silver nanoparticles synthesis has been developed to obtain cost effective, clean, nontoxic, and ecofriendly size-controlled nanoparticles. The objective of this study is extracellular biosynthesis of antimicrobial AgNPs using cell-free supernatant of a localStreptomycessp. strain SSHH-1E. Different medium composition and fermentation conditions were screened for maximal AgNPs biosynthesis using Plackett-Burman experimental design and the variables with statistically significant effects were selected to study their combined effects and to find out the optimum values using a Box-Behnken design. The synthesized AgNPs were characterized using UV-visible spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and energy dispersive X-ray spectroscopy. Rapid biosynthesis of AgNPs was achieved by addition of 1 mM AgNO3solution to the cell-free supernatant. The produced particles showed a single surface plasmon resonance peak at 400 nm by UV-Vis spectroscopy which confirmed the presence of AgNPs.Streptomycessp. SSHH-1E was identified asStreptomyces narbonensisSSHH-1E. Transmission electron microscopy study indicated that the shape of AgNPs is spherical and the size is ranging from 20 to 40 nm. Fourier transform infrared spectroscopy analysis provides evidence for proteins as possible reducing and capping agents. Furthermore, the biosynthesized AgNPs significantly inhibited the growth of medically important pathogenic Gram-positive and Gram-negative bacteria and yeast. The maximum biosynthesis of AgNPs was achieved at initial pH of 8, peptone of 0.5 g, and inoculum age of 48 h. The statistical optimization resulted in a 4.5-fold increase in the production of AgNPs byStreptomyces narbonensisSSHH-1E.

scholarly journals A Comparative Study of Biosynthesized Silver-Nanoparticles from Citrus maxima Peel, Pulp and Seed: A Special Retrospect for Antimicrobial Activity

2021 ◽  
pp. 454-463
Author(s):  
Priyanka Mishra ◽  
Tanzeel Ahmed ◽  
Lalit Singh
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Transmission Electron ◽  
Citrus Maxima ◽  
Uv Visible ◽  
Peel Extract

Background: Silver nanoparticles (AgNPs) have been used in various medicinal products because of its anti-microbial properties. This research study has reported a simplistic, cost effective and eco-friendly method for the synthesis of Silver nanoparticles. Objective: The objective of present study was to compare the synthesis of silver nanoparticles (AgNPs) from various parts of Citrus maxima fruit like pulp, peel and seed. Methodology: The synthesized nanoparticles were characterized by the use of UV-visible spectroscopy, fourier transform infrared spectroscopy and transmission electron microscopy. Time-dependent synthesis of AgNPs was studied spectrophotometrically. UV–visible spectrophotometer was used to confirm the synthesis of AgNPs which showed maximum absorption at 410 nm, 420 nm and 430 nm respectively. Expected Results: Fresh peel extract exhibited the highest concentration of silver nanoparticles in comparison to pulp and seed. Fourier-transform infrared spectroscopy (FTIR) spectra analysis confirmed the presence of possible functional groups in AgNPs which can be responsible for reduction of nanoparticles. Morphological characters of AgNPs were analyzed using transmission electron microscopy (TEM) depicting the particles size as 12.58-47.80 nm. The antibacterial property of synthesized AgNPs was analyzed viz Escherichia coli (MTCC 1687) and Staphylococcus aureus (MTCC 902), specify them to be effective against both gram positive and gram negative bacteria. Conclusion: These results suggested that the fresh peel extract of Citrus maxima is a high-quality bioreductant for the synthesis of silver nanoparticles and have prospective for various biomedical applications.

scholarly journals Fourier Transform Infrared Spectroscopy vibrational bands study of Spinacia oleracea and Trigonella corniculata under biochar amendment in naturally contaminated soil

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0253390
Author(s):  
Uzma Younis ◽  
Ashfaq Ahmad Rahi ◽  
Subhan Danish ◽  
Muhammad Arif Ali ◽  
Niaz Ahmed ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Functional Groups ◽  
Structural Changes ◽  
Spinacia Oleracea ◽  
Fourier Transform Infrared ◽  
Ftir Spectra ◽  
Leaf Chlorophyll ◽  
Vibrational Bands

Fourier transform infrared spectroscopy (FTIR) spectroscopy detects functional groups such as vibrational bands like N-H, O-H, C-H, C = O (ester, amine, ketone, aldehyde), C = C, C = N (vibrational modes of a tetrapyrrole ring) and simply C = N. The FTIR of these bands is fundamental to the investigation of the effect of biochar (BC) treatment on structural changes in the chlorophyll molecules of both plants that were tested. For this, dried leaf of Spinacia oleracia (spinach) and Trigonella corniculata (fenugreek) were selected for FTIR spectral study of chlorophyll associated functional groups. The study’s primary goal was to investigate the silent features of infrared (IR) spectra of dried leave samples. The data obtained from the current study also shows that leaf chlorophyll can mask or suppress other molecules’ FITR bands, including proteins. In addition, the C = O bands with Mg and the C9 ketonic group of chlorophyll are observed as peaks at1600 (0%BC), 1650 (3%BC) and 1640, or near to1700 (5%BC) in spinach samples. In fenugreek, additional effects are observed in the FTIR spectra of chlorophyll at the major groups of C = C, C = O and C9 of the ketonic groups, and the vibrational bands are more evident at C-H and N-H of the tetrapyrrole ring. It is concluded that C-N bands are more visible in 5% BC treated spinach and fenugreek than in all other treatments. These types of spectra are useful in detecting changes or visibility of functional groups, which are very helpful in supporting biochemical data such as an increase in protein can be detected by more visibility of C-N bands in FTIR spectra.

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