scholarly journals Antioxidant and antimicrobial studies of nanochitosan, carboxymethyl cellulose and graphene oxide binary and ternary composites

YMER Digital ◽  
2021 ◽  
Vol 20 (12) ◽  
pp. 426-438
Author(s):  
S Sugashini ◽  
◽  
T Gomathi ◽  
P.N Sudha ◽  
◽  
...  

The present study aimed to prepare binary and ternary composites of nanochitosan (NCS), carboxymethyl cellulose (CMC) and graphene oxide (GO) for the biological and biomedical application. The prepared NCS/CMC, CMC/GO and NCS/CMC/GO composites were characterized using FTIR, XRD and SEM studies. The results revealed the suitability of the material for biological application with increased amorphous nature for cell adhesion. Antimicrobial studies were carried out against selected bacterial and fungal species. DPPH scavenging activity was done for the prepared biocomposites. NCS/CMC/GO ternary composite have the highest action against Bacillus sp (21 mm) followed by Klebsilla sp. (19 mm) and Proteus sp. (16 mm). For selected fungal species of Candida, Rhizopus and Aspergillus niger the ternary composites shows 28 mm, 26 mm and 24 mm inhibitory zone. The overall results exhibit the potential antioxidant and antimicrobial activity of the prepared composites.

2017 ◽  
Vol 35 (No. 3) ◽  
pp. 189-193 ◽  
Author(s):  
Branislav Šojić ◽  
Vladimir Tomović ◽  
Marija Jokanović ◽  
Predrag Ikonić ◽  
Natalija Džinić ◽  
...  

The antioxidant and antimicrobial activity of Juniperus communis L. essential oil (JO) in cooked sausages was examined. Sausages with different concentrations of JO (0.15.0 µl/g) and a control were prepared. Instrumental parameters of colour (CIE L*a*b*), TBARS values, DPPH scavenging activity assay, microbial profile, and sensory panel scores have been assessed. Batches produced with the JO addition were darker and redder compared to the control. Sausages with the addition of 1.0, 2.0 and 5.0 µl/g JO showed the significantly (P < 0.05) lower TBARS values compared to the control. The addition of JO decreased radical formation and reduced the growth of total aerobic mesophilic bacteria. The flavour of sausages produced with the addition of 0.1 and 0.5 µl/g JO was slightly/moderately and significantly (P < 0.05) different from the control. This study demonstrates the significant antioxidant and antimicrobial activity of Juniperus communis L. essential oil, as well as the potential of its utilisation in the production of cooked pork sausages to enhance quality.


2020 ◽  
pp. 15-21
Author(s):  
Arindam Ghosh ◽  
Soumya Majumder ◽  
Sumedha Saha ◽  
Malay Bhattacharya

Beneficial properties of shade trees of tea plantations other than their medicinal properties have been extensively studied. This research was initiated to explore the properties of some shade trees with special emphasis on their antioxidant and antibacterial properties. Leaves from shade tree like Dalbergia sissoo (DS), Cassia siamea (CS), Derris robusta (DR), Leucaena leucocephala (LL), Acacia lenticularis (AL) and Melia azedarach (MA) were used for the study. Characterization of shade tree leaves by determination of moisture, crude fibre and ash content and tests of non polar – polar solvent extracts for steroid, tannins, cardiac glycosides and coumarin, free radical scavenging, ferric reducing power, NO scavenging activities, quantification of Flavonoids and antibacterial activity were conducted. The average moisture, crude fibre and ash percentage of shade tree plants were found to be 62.95, 11.28 and 1.86 respectively. Methanol, ethanol, acetone and ethyl acetate respectively proved to be the most potent solvent for various phytochemical extractions as it gave positive results for tests like tannin, steroid, cardiac glycosides and coumarin. AL (91.46%), DR (92.69%), LL (94.32%) and MA (93.34%) leaf extracts showed a high level of DPPH scavenging activity in their water extracts. In DS (88.11%) and CS (83.23%) maximum DPPH scavenging activity was observed in Diethyl ether and Methanol extracts respectively.  Acetone extracts were more active than the water extracts in exhibiting ferric reducing power and NO scavenging activity. Summation of the quantity revealed that DS showed maximum presence of flavonoids and acetone as most potential for isolation of flavonoids. The decreasing order of summative antibacterial activity was recorded in DS, followed by CS, DR, AL, MA and LL. Chloroform showed the highest summative inhibition zone followed by ethanol, ethyl acetate, diethyl ether, acetone, water,  hexane, benzene and methanol. The antioxidant and antibacterial potential of shade trees were established.


RSC Advances ◽  
2021 ◽  
Vol 11 (45) ◽  
pp. 27801-27811
Author(s):  
M. Vandana ◽  
Y. S. Nagaraju ◽  
H. Ganesh ◽  
S. Veeresh ◽  
H. Vijeth ◽  
...  

Representation of the synthesis steps of SnO2QDs/GO/PPY ternary composites and SnO2QDs/GO/PPY//GO/charcoal asymmetric supercapacitor device.


Foods ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 59
Author(s):  
Janusz Malarz ◽  
Klaudia Michalska ◽  
Anna Stojakowska

The objective of the present study was to characterize chemical composition of hitherto unexamined aerial parts of Lactuca sativa var. angustana cv. Grüner Stern. In contrast to leafy and head varieties of the lettuces, asparagus lettuce grown in Europe is much less studied. Fractionation of a methanolic extract from leaves of L. sativa cv. Grüner Stern, supported with HPLC/DAD and 1H NMR analysis, led to the isolation and/or identification of numerous terpenoid and phenolic compounds, including five apocarotenoids—(-)-loliolide, (+)-dehydrovomifoliol, blumenol A, (6S,9S)-vomifoliol, and corchoionoside C; three sesquiterpene lactones; two lignans—((+)-syringaresinol and its 4-O-β-glucoside); five caffeic acid derivatives; and three flavonoids. Some of the compounds, to the best of our knowledge, have never been isolated from L. sativa before. Moreover, monolignols, phenolic acids and a tryptophan-derived alkaloid were found in the analyzed plant material. Stems, leaves and shoot tips of the asparagus lettuce were examined to assess their phenolics and sesquiterpene lactone content as well as DPPH scavenging activity. Another stem lettuce—L. sativa var. angustana cv. Karola, two cultivars of leafy lettuces and one species of wild lettuce—L. serriola, were also examined as a reference material using HPLC/DAD. The results have been discussed regarding our previous studies and the literature data available.


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