The effect of different extraction methods and pre-treatments on agar yield and physico-chemical properties of Gelidium latifolium (Gelidiaceae, Rhodophyta) from Sinop Peninsula Coast of Black Sea, Turkey

2017 ◽  
Vol 30 (2) ◽  
pp. 1355-1360 ◽  
Author(s):  
Özen Yusuf Öğretmen ◽  
Hünkar Avni Duyar
Keyword(s):  
Black Sea ◽  
Chemical Properties ◽  
Extraction Methods ◽  
Agar Yield ◽  
Physico Chemical ◽  
Gelidium Latifolium

Analysis of 14 drugs in dried blood microsamples in a single workflow using whole blood and serum calibrators

Bioanalysis ◽  
2020 ◽  
Vol 12 (17) ◽  
pp. 1243-1261
Author(s):  
István Vincze ◽  
James Rudge ◽  
Barna Vásárhelyi ◽  
Gellért Balázs Karvaly
Keyword(s):  
Whole Blood ◽  
Total Error ◽  
Real Life ◽  
Chemical Properties ◽  
Extraction Methods ◽  
Therapeutic Drug ◽  
High Throughput Analysis ◽  
Method Performance ◽  
Physico Chemical ◽  
High Polarity

Aim: Multiplexed, high-throughput analysis facilitates therapeutic drug monitoring. 14 drugs with various physico-chemical properties were quantitated in dried blood microsamples. Methods: Analytes were extracted employing eight solvent compositions and seven extraction methods. The applicability of liquid serum, dried serum and dried whole blood calibrators was investigated. Results: High recoveries were attained. Calibration using dried serum yielded lowest total error. Reducing sample hematocrit caused outstanding elevations in recovery of analytes with high polarity or affinity to erythrocytes. 9-day analyte stability was demonstrated. Conclusion: Based on the analysis of spiked samples, multiplexed testing of drugs in dried blood microsamples seems feasible, but with analyte-dependent method performance. Dried serum calibration allows the adaptation of serum-based workflows. Further evaluation using real-life specimens is needed.

scholarly journals Methods of extraction, physicochemical properties of alginates and their applications in biomedical field – a review

2019 ◽  
Vol 17 (1) ◽  
pp. 738-762 ◽  
Author(s):  
Magdalena Beata Łabowska ◽  
Izabela Michalak ◽  
Jerzy Detyna
Keyword(s):  
Chemical Properties ◽  
Extraction Methods ◽  
Wound Management ◽  
Probiotic Properties ◽  
Food Ingredient ◽  
Variable Yield ◽  
Current State ◽  
Physico Chemical ◽  
Potential Applications

AbstractIn this paper, the current state-of-art of extraction of alginates and the determination of their physico-chemical properties as well as their overall applications focussing on biomedical purposes has been presented. The quality and quantity of the alginate obtained with a variable yield prepared from brown seaweeds as a result of many factors, such as type of algae, extraction methods, chemical modification and others. Alginates are mainly extracted by using conventional alkaline extraction. However, novel extraction techniques such as microwave and ultrasound assisted extractions have gained a lot of interest. The extraction parameters (e.g., temperature and time of extraction) have critical impact on the alginate physiochemical and mechanical properties and thus, their potential applications. By controlling a chemical process makes it possible get various forms of alginates, such as fibres, films, hydrogels or foams. It is important to characterise the obtained alginates in order to their proper applications. This article presents several techniques used for the analysis of alginate properties. These natural polysaccharides are widely used in the commercial production, as a food ingredient, in the pharmaceutical industry due to their antibacterial, anticancer and probiotic properties. Their gelling characteristic and absorbable properties enable using alginates as a wound management material. Moreover, they are also biocompatible, non-toxic and biodegradable, therefore adequate in other biomedical applications.

Acetonitrile as tops solvent for liquid chromatography and extraction

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Oleg Borisovich Rudakov ◽  
Liudmila V. Rudakova ◽  
Vladimir F. Selemenev
Keyword(s):  
Mobile Phase ◽  
Chemical Properties ◽  
Refraction Index ◽  
Extraction Methods ◽  
Reversed Phase ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction ◽  
Optic Density ◽  
Mobile Phases ◽  
Physico Chemical

This article deals with acetonitrile physico-chemical properties and its mixtures with water. It covers the information about isotherms of such parameters of the acetonitrile-water binary system as density, viscosity, permeation coefficient, refraction index, optic density, a boiling point isobar. Authors suggest a generalized criterion of acetonitrile polarity. The article also discusses means of polarity assessment and eluotropic strength of mobile phases on the basis of acetonitrile mixtures with water with application of generalized criteria. Special attention is paid to the options of acetonitrile application in various extraction methods of chromatographic sample preparation. The article also reveals advantages and problems of acetonitrile application as a mobile phase modifying agent in the HPLC reversed-phase and as a hydrophilic extra-agent in liquid-liquid extraction.

INFLUENCE OF BLACK SEA SAPROPELLES ON SOME SOILS WITH UNFAVORABLE PHYSICO-CHEMICAL PROPERTIES AND WATER-AIR REGIME

2011 ◽  
Vol III (5) ◽  
pp. 33-36
Author(s):  
Nikolay Nikolov ◽  
Nedyalka Artinova ◽  
Dimitar Dimitrov
Keyword(s):  
Black Sea ◽  
Chemical Properties ◽  
Physico Chemical

scholarly journals EXTRACTION METHODS AND ADSORPTION KINETICS OF POTASSIUM IN CALCAREOUS SOILS OF MULTAN

2021 ◽  
Vol 37 (2) ◽  
pp. 87-96
Author(s):  
M. Aurangzeib ◽  
S. Hussain ◽  
A. Rehim ◽  
M. A. Bashir ◽  
H. M. A. Raza
Keyword(s):  
Calcium Carbonate ◽  
Pearson Correlation ◽  
Calcareous Soils ◽  
Chemical Properties ◽  
Extraction Methods ◽  
Exchange Capacity ◽  
Physico Chemical ◽  
Function Models ◽  
Kinetics Of ◽  
K Fertilization

Understanding the dynamics of potassium (K) and its availability is fundamental in its efficient use as an important nutrient. The objectives of present study were to compare standard K extraction methods for extractable K and kinetics of K adsorption on five different textured soils. The soils were analyzed for physico-chemical properties, extractable K contents and kinetics of K adsorption. The soils had variable contents of soluble (8-52mg kg-1), exchangeable (13-215mg kg-1), fixed (488-1836mg kg-1), structural (2936-26362mg kg-1) and total K (3438-28517mg kg-1). Except soluble K, the amount of K in different forms was significantly (P?0.05) correlated with clay contents, electrical conductivity (EC), cation exchange capacity (CEC) and calcium carbonate in soils. Different methods variated the extracted K in different textured soils. Mehlich-III, ammonium acetate, AB-DTPA, and calcium chloride extracted K was maximum in sandy clay loam (298mg kg-1, 267mg kg?1, 226mg kg-1, and 113mg kg-1) and lowest was in loamy sand (33mg kg-1, 24mg  kg-1, 30mg kg-1, and 24mg   kg-1) respectively. Elovich and power function models best explained the K kinetics adsorption, as rate of adsorption constants were negatively correlated with sand contents in the soil type. Pearson correlation showed that the extractability of K by different methods and kinetics of K adsorption were dependent on soil texture EC, CEC and calcium carbonate contents. Hence, soil physico-chemical properties should be considered in recommending rate of K fertilization along with crop K demand and soil extractable K.

Blueberry Pectin Extraction Methods Influence Physico‐Chemical Properties

2018 ◽  
Vol 83 (12) ◽  
pp. 2954-2962 ◽  
Author(s):  
Jeewon Koh ◽  
Zhimin Xu ◽  
Louise Wicker
Keyword(s):  
Chemical Properties ◽  
Extraction Methods ◽  
Physico Chemical

scholarly journals Evaluation of the saponin green extraction from Ziziphus spina-christi leaves using hydrothermal, microwave and Bain-Marie water bath heating methods

2019 ◽  
Vol 8 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Mahdiyeh Mohaddes-Kamranshahi ◽  
Hoda Jafarizadeh-Malmiri ◽  
Mohammad Simjoo ◽  
Abbas Jafarizad
Keyword(s):  
High Performance ◽  
Chemical Properties ◽  
Extraction Methods ◽  
Color Intensity ◽  
Heating Method ◽  
Green Extraction ◽  
Physico Chemical ◽  
Ft Ir ◽  
Ir Analysis ◽  
Water Bath Heating

Abstract Saponin as a biosurfactant was extracted from Iranian Ziziphus spina-christi leaves using three green extraction methods namely, autoclave, microwave and Bain-Marie heating methods. In this study, three solvents namely, methanol, ethanol and water were used to extract saponin. The results revealed that water, as compared to the methanol and ethanol, is a more suitable solvent to extract saponin from the Z. spina-christi leaves. The obtained results indicated that saponin extraction using autoclave provided more suitable physico-chemical properties along with a better yield. In fact, maximum foam volume (12.56 cm3), color intensity (3.24% absorbance unit [a.u.]) and turbidity (1.39% a.u.) of the extracted solutions was obtained by the autoclave heating method. The high performance liquid chromatography (HPLC) results also illustrated that the amounts of extracted saponin using autoclave, Bain-Marie and microwave heating extraction methods were 14, 8.8 and 1.3 (intensity mV), respectively. The results obtained by HPLC were reconfirmed by Fourier transform infrared (FT-IR) analysis.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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