Light-colored lignin isolated from poplar by ultrasound-assisted ethanol extraction: Structural features and anti-ultraviolet and anti-oxidation activities

2022 ◽  
Vol 176 ◽  
pp. 114359
Author(s):  
Xiuru Su ◽  
Yingjuan Fu ◽  
Zhiyong Shao ◽  
Menghua Qin ◽  
Xiaoliang Li ◽  
...  
Keyword(s):  
Structural Features ◽  
Ethanol Extraction ◽  
Ultrasound Assisted

scholarly journals Astaxanthin Recovery from Shrimp Residue by Solvent Ethanol Extraction Using Choline Chloride:Glycerol Deep Eutectic Solvent as Adjuvant

2021 ◽  
Author(s):  
Cleidijane dos Santos ◽  
Carlos Padilha ◽  
Karla Damasceno ◽  
Pedro Leite ◽  
Ana de Araújo ◽  
...  
Keyword(s):  
Radical Scavenging ◽  
Deep Eutectic Solvent ◽  
Free Radical Scavenging ◽  
Gram Negative Bacteria ◽  
Total Carotenoid ◽  
Total Carotenoids ◽  
Clear Trend ◽  
Ethanol Extraction ◽  
Gram Negative ◽  
Ultrasound Assisted

The present study investigated the use of choline chloride:glycerol deep eutectic solvent as an adjuvant for tuning the ethanol extraction of astaxanthin from Litopenaeus vannamei processing residues. The adjuvant concentration did not show a clear trend on the total carotenoid, however, the addition of adjuvant proved to be advantageous in the ultrasound-assisted experiments. In order to establish a balance between total carotenoid and productivity, an operational condition with ultrasound, 5% (m/v) choline chloride:glycerol and 10 min of incubation was selected, which provided 737.69 μg g-1 total carotenoids and 32.71 μg g-1 astaxanthin. When compared to the astaxanthin standard, the shrimp residue extract obtained greater antioxidant activity in free radical scavenging tests. In addition, the shrimp residue extract dramatically reduced the dosage of norfloxacin (up to 87.5%) and gentamicin (up to 75.0%) antibiotics in tests to inhibit the growth of gram-negative bacteria.

scholarly journals Sonochemical Synthesis of 2’-Hydroxy-Chalcone Derivatives with Potential Anti-Oomycete Activity

Antibiotics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 576
Author(s):  
Génesis López ◽  
Marco Mellado ◽  
Enrique Werner ◽  
Bastián Said ◽  
Patricio Godoy ◽  
...  
Keyword(s):  
Quantitative Structure Activity Relationship ◽  
Structural Features ◽  
Effective Concentration ◽  
Quantitative Structure ◽  
Sonochemical Synthesis ◽  
Qsar Analysis ◽  
Structure Activity ◽  
Half Maximal Effective Concentration ◽  
Amine Groups ◽  
Ultrasound Assisted

This work reports on the synthesis of eight new 2′-hydroxy-chalcones with potential anti-phytopathogenic applications in agroindustry, AMONG others, via Claisen–Schmidt condensation and ultrasound assisted reaction. Assays showed three chalcones with allyl moieties strongly inhibited growth of phytopathogenic oomycete Phytophthora infestans; moreover, compound 8a had a half maximal effective concentration (EC50) value (32.5 µg/mL) similar to that of metalaxyl (28.6 µg/mL). A software-aided quantitative structure–activity relationship (QSAR) analysis of the whole series suggests that the structural features of these new chalcones—namely, the fluoride, hydroxyl, and amine groups over the carbon 3′ of the chalcone skeleton—increase anti-oomycete activity.

scholarly journals The Ethanol Supernatant Extracts of Liushenwan Could Alleviate Nanodiethylnitrosamine-Induced Liver Cancer in Mice

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Xi-Zhen Chen ◽  
Wei Kevin Zhang ◽  
He-Bin Tang ◽  
Xiao-Jun Li ◽  
Gui-Hua Tian ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Chinese Medicine ◽  
Liver Cancer ◽  
Liver Tumor ◽  
Supernatant Fraction ◽  
Ethanol Extraction ◽  
Prevention And Treatment ◽  
Ultrasound Assisted ◽  
Cox 2 ◽  
Intragastric Gavage

Liver cancer is one of the leading causes of cancerous deaths worldwide. At present, the treatment of hepatocellular carcinoma (HCC) remains to be a problem globally. Liushenwan (LSW), an ancient Chinese medicine previously used to treat localized infections, was recently reported to possess anticancer activity. Here in this study, we aim to examine the effect of LSW-ET (LSW-ET is the supernatant fraction of LSW from ultrasound assisted ethanol extraction) in prevention and treatment on nanodiethylnitrosamine- (nanoDEN-) induced HCC in mice. In nanoDEN-induced HCC mice treated with LSW-ET by oral (po) or intragastric gavage (ig), we observed an alleviation of serum ALT and AST levels, amelioration in histopathological stainings, and an inhibition in liver tumor growth. In addition, compared with the nanoDEN group, downregulation of multiple pivotal factors (COX-2,β-catenin, PCNA, and HMGB-1) was observed in LSW-ET-po and LSW-ET-ig groups. Taken together, the delivery of LSW-ET by oral could be a potential prevention and treatment of liver cancer.

Extraction, preparative monomer separation and antibacterial activity of total polyphenols from Perilla frutescens

2021 ◽  
Author(s):  
Yana Zhao ◽  
Huizhen Li ◽  
Zhijun Zhang ◽  
Zhiqing Ren ◽  
Fuhan Yang
Keyword(s):  
Antibacterial Activity ◽  
Caffeic Acid ◽  
Rosmarinic Acid ◽  
Perilla Frutescens ◽  
Total Polyphenols ◽  
Ethanol Extraction ◽  
Functional Activities ◽  
Ultrasonic Assisted ◽  
Ultrasound Assisted

Polyphenols display potential functional activities especially for rosmarinic acid (RosA) and caffeic acid (CafA). In this study, two different methods including ultrasonic-assisted ethanol extraction (60%) and ultrasound-assisted cellulase (≥ 15000...

Electron microscopy and diffraction studies of polyimides

1983 ◽  
Vol 41 ◽  
pp. 28-29
Author(s):  
O.C. de Hodgins ◽  
K. R. Lawless ◽  
R. Anderson
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Structural Features ◽  
Inert Atmosphere ◽  
Polyimide Films ◽  
Resolution Electron ◽  
The Matrix ◽  
High Resolution Electron Microscope ◽  
Diffraction Patterns ◽  
Polymeric Samples

Commercial polyimide films have shown to be homogeneous on a scale of 5 to 200 nm. The observation of Skybond (SKB) 705 and PI5878 was carried out by using a Philips 400, 120 KeV STEM. The objective was to elucidate the structural features of the polymeric samples. The specimens were spun and cured at stepped temperatures in an inert atmosphere and cooled slowly for eight hours. TEM micrographs showed heterogeneities (or nodular structures) generally on a scale of 100 nm for PI5878 and approximately 40 nm for SKB 705, present in large volume fractions of both specimens. See Figures 1 and 2. It is possible that the nodulus observed may be associated with surface effects and the structure of the polymers be regarded as random amorphous arrays. Diffraction patterns of the matrix and the nodular areas showed different amorphous ring patterns in both materials. The specimens were viewed in both bright and dark fields using a high resolution electron microscope which provided magnifications of 100,000X or more on the photographic plates if desired.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

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