scholarly journals Edible films gelatin-based obtained from mahi-mahi skin (Coryphaena hippurus) and oregano extract: Physicochemical, antimicrobial, structural and surface characteristics

2021 ◽  
Vol 12 (2) ◽  
pp. 229-237
Author(s):  
Silvia Pandia-Estrada ◽  
Renzo Romero-Santivañez ◽  
Roxana Céspedes-Chombo ◽  
Armando Solari-Godiño
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antimicrobial Activity ◽  
Lipid Fraction ◽  
Surface Characteristics ◽  
Edible Films ◽  
Proteus Vulgaris ◽  
Coryphaena Hippurus ◽  
Film Forming ◽  
Scanning Electron

Edible films were elaborated from gelatin solutions (4% w/v) of mahi-mahi skin (Coryphaena hippurus) with 2,5; 5; 7,5 and 10% v/v of oregano extract (OE) and its physicochemical, antimicrobial, structural and surface properties were determined. The control and with 2.5% OE films showed the lowest moisture and opacity values and the highest viscosity values. All films with OE inhibited the growth of Staphylococcus aureus and Proteus vulgaris. Alone films with 10% OE showed antimicrobial activity against all the strains evaluated. Scanning electron microscopy showed that the incorporation of oregano extract in the film-forming solutions, FFS, was related to an increase in the presence of oil droplets in the films, showing the lipid fraction of OE. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analyzes showed the interaction between gelatin, plasticizer, and oregano extract in all films. In conclusion, this study demonstrated the viability of mahi-mahi skin gelatin edible films with OE incorporated for their application as packaging with antimicrobial action in foods susceptible to spoilage by microorganisms.

scholarly journals Ultrastructural Study of Elaeis guineensis (Oil Palm) Leaf and Antimicrobial Activity of its Methanol Extract against Staphylococcus Aureus

2016 ◽  
Vol 12 (3) ◽  
pp. 419-423 ◽  
Author(s):  
Amala Rajoo ◽  
Sreenivasan Sasidharan ◽  
Subramanion L Jothy ◽  
Surash Ramanathan ◽  
Sharif M Mansor
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Staphylococcus Aureus ◽  
Transmission Electron Microscopy ◽  
Antimicrobial Activity ◽  
Methanol Extract ◽  
Elaeis Guineensis ◽  
Transmission Electron ◽  
Inhibition Concentration ◽  
Scanning Electron

Purpose: To evaluate the antimicrobial activity of the methanol extract of Elaeis guineensis leaf against Staphylococcus aureus and to determine the effect of extract treatment on the microstructure of the microbeMethods: The antimicrobial activity of the methanol leaf extract of the plant against S. aureus was examined using disc diffusion and broth dilution methods. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were carried out to determine the major alterations in the microstructure of S. aureus after treatment with the extract.Results: The extract showed a good antimicrobial activity against S. aureus with a minimum inhibition concentration (MIC) of 6.25 mg/mL and for Chloramphenicol was 30.00 ìg/mL. The main changes observed under SEM and TEM were structural disorganization of the cell membrane which occurred after 12 h and total collapse of the cell 36 h after exposure to the extract.Conclusion: We concluded that the methanolic extract of E. guineensis leaf exhibited good antimicrobial activity against S. aureus and this is supported by SEM and TEM.Keywords: Antimicrobial activity, Elaeis guineensis, Staphylococcus aureus, Scanning electron microscopy, Transmission electron microscopy

Segmentation and analysis of surface characteristics of oral tissues obtained by scanning electron microscopy to differentiate normal and oral precancerous condition

2019 ◽  
Vol 59 ◽  
pp. 82-87
Author(s):  
Reetoja Nag ◽  
Mousumi Pal ◽  
Ranjan Rashmi Paul ◽  
Jyotirmoy Chatterjee ◽  
Raunak Kumar Das
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Characteristics ◽  
Precancerous Condition ◽  
Scanning Electron

THE SCANNING ELECTRON MICROSCOPIC MORPHOLOGY OF QUARTZ IN SELECTED SOILS FROM ALBERTA

1987 ◽  
Vol 67 (4) ◽  
pp. 965-971 ◽  
Author(s):  
J. M. W. BLACK ◽  
M. J. DUDAS
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Surface Characteristics ◽  
Fine Sand ◽  
Parent Material ◽  
Electron Microscopic ◽  
Physical Weathering ◽  
Silica Precipitation ◽  
Scanning Electron

This study compared the surface morphology of quartz grains from A and C horizons of a Chernozem, Luvisol and a Solonetz. Observations and chemical determinations were based on scanning electron microscopy and energy dispersive X-ray analysis of fine sand separates. Features indicative of glacial and eolian transport, physical weathering by low energy subaqueous impact, and chemical dissolution and silica precipitation dominated surface characteristics. Most surface morphological features were of an inherited origin since they were common to solum and parent material samples. Quartz dissolution features were not uniquely associated with solum samples and apparently not of pedogenic origin. Key words: Scanning electron microscopy, quartz, pedogenesis, surface morphology, weathering classification

scholarly journals Analysis of the surface characteristics and mineralization status of feline teeth using scanning electron microscopy

2006 ◽  
Vol 209 (5) ◽  
pp. 655-669 ◽  
Author(s):  
A. DeLaurier ◽  
A. Boyde ◽  
M. A. Horton ◽  
J. S. Price
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Characteristics ◽  
Scanning Electron

scholarly journals Green Synthesis, Characterization, and Evaluation of the Antimicrobial Activity of Camellia sinensis Silver Nanoparticles

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Toga Khalid Mohamed ◽  
Marivt Osman Widdatallah ◽  
Maida Musa Ali ◽  
Afraa Mubarak Alhaj ◽  
DhiaEldin AbdElmagied Elhag
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Camellia Sinensis ◽  
Multiple Drug Resistance ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Scanning Electron

An extremely worrying and alarming increase in the level of multiple drug resistance is reported in Sudan, in which bacterial strains are becoming resistant to many commonly available antibiotics. Eventually, it is becoming extremely difficult to treat debilitating infections. In search of promising solutions to this arising crisis, Camellia sinensis silver nanoparticles were synthesized using the green synthesis method. The synthesis of the Camellia sinensis silver nanoparticles is confirmed using analytical methods as ultraviolet-visible spectroscopy, X-ray diffractometer, and scanning electron microscopy. Using the ultraviolet-visible spectroscopy, an absorption band of 412 nm was observed. Furthermore, scanning electron microscopy revealed the presence of silver nanoparticles which fell within the range of 1–100 nm, and X-ray diffractometer analysis showed three intense peaks with a maximum intense peak at 24.3 theta. Nanoparticles distribution between 12 nm and 64 nm was observed with an average diameter of 18.115 nm. It also revealed orthorhombic-shaped nanoparticles. The synthesized nanoparticles showed antimicrobial activity against Staphylococcus aureus with a zone of inhibition of 7 mm, but none was detected against Escherichia coli. The obtained physicochemical properties were correlated with the antibacterial activity of the silver nanoparticles.

Sign in / Sign up

Export Citation Format

Share Document