scholarly journals Quantification of Residual Perfume by Py-GC-MS in Fragrance Encapsulate Polymeric Materials Intended for Biodegradation Tests

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 718
Author(s):  
Giulio Gasparini ◽  
Sarah Semaoui ◽  
Jessica Augugliaro ◽  
Alain Boschung ◽  
Damien Berthier ◽  
...  
Keyword(s):  
Storage Stability ◽  
3D Structure ◽  
Deep Understanding ◽  
Polymeric Materials ◽  
Kinetic Release ◽  
Polymeric Microcapsules ◽  
Purification Protocol ◽  
A Current ◽  
Standard Techniques ◽  
Selection Of

Perfume encapsulates are widely used in commercial products to control the kinetic release of odorant molecules, increase storage stability and/or improve deposition on different substrates. In most of the cases, they consist of core-shell polymeric microcapsules that contain fragrance molecules. A current challenge is to design and produce polymeric materials for encapsulation that are both resistant and non-persistent. The selection of such eco-friendly formulations is linked to a deep understanding of the polymeric material used for encapsulation and its biodegradation profile. To collect this information, pure samples of capsule shells are needed. In this article we present an innovative quantification method for residual volatiles based on pyrolysis-GC-MS to enable validation of sample quality prior to further testing. The presented analytical method also led to the development of a robust and comprehensive purification protocol for polymers from commercial samples. Standard techniques are not suited for this kind of measurement due to the non-covalent embedding of volatiles in the 3D structure of the polymers. We demonstrated the confounding impact of residual volatiles on the estimated biodegradability of fragrance encapsulates.

INFLUENCE OF LINGONBERRY FRUITS ON STORAGE STABILITY OF FLOUR COMPOSITE BASED ON OAT FLOUR

2019 ◽  
Author(s):  
Л.В. АНИСИМОВА ◽  
О.И.А. СОЛТАН
Keyword(s):  
Storage Stability ◽  
Storage Temperature ◽  
Wheat Gluten ◽  
Polymeric Materials ◽  
Natural Antioxidants ◽  
Acid Number ◽  
Product Packaging ◽  
Polyethylene Bags ◽  
Oat Flour ◽  
Fruit Powder

Проведена сравнительная оценка стойкости при хранении цельнозерновой овсяной муки (ЦМ) и мучной композитной смеси (МКС) на основе ЦМ. В состав МКС помимо ЦМ (66,7%) включены: мука пшеничная хлебопекарная высшего сорта (16,5%), сухая пшеничная клейковина (3,5%) и измельченные сушеные ягоды брусники (13,3%). Овсяную муку и МКС хранили в тканевых мешках и полиэтиленовых пакетах (ПП) при температуре (20 ± 0,5)°C и (40 ± 1)°C. Контролировали влажность, кислотность по болтушке и кислотное число жира (КЧЖ). Выявлено, что равновесная влажность овсяной муки и МКС, хранившихся в ПП при температуре (40 ± 1)°C и относительной влажности воздуха (65 ± 0,1)%, была практически одинаковой: 11,2 и 11,4% соответственно. При хранении образцов в ПП при температуре (40 ± 1)°C через 150 сут кислотность и КЧЖ МКС увеличились в 1,7 и 4,2 раза соответственно, кислотность и КЧЖ цельнозерновой овсяной муки – в 2,9 и 6,3 раза соответственно. На изменение исследуемых показателей качества также повлияли температура хранения и способ упаковки продукции. Установлено, что введение в состав МКС измельченных сушеных ягод брусники, содержащих природные антиоксиданты, привело к снижению в 1,5 раза темпов роста кислотности по болтушке и КЧЖ и к повышению в 1,3 раза по КЧЖ стойкости МКС при хранении по сравнению с цельнозерновой овсяной мукой. Рекомендовано в качестве тары для хранения МКС использовать герметично закрывающиеся пакеты из пищевого полиэтилена или других пищевых полимерных материалов. A comparative evaluation of the storage stability of the flour composite was prepared based on the whole oat flour and containing dried lingonberry fruits powder, and whole oat flour. The flour composite, in addition to whole oat flour, included: High-grade wheat Flour (16,5%), dry wheat gluten (3,5%), and dried lingonberry fruits powder (13,3%). Oat flour and flour composite were stored in cloth bags and polyethylene bags at a temperature of (20 ± 0,5)°C and (40 ± 1)°C. Moisture, acidity, and the acid number of fat were determined. It was revealed that the moisture content of oat flour and flour composite stored in polyethylene bags at a temperature of (40 ± 1)°C and relative humidity (65 ± 0,1)% was almost the same: 11,2 and 11,4%, respectively. When stored samples in polyethylene bags at a temperature of (40 ± 1)°C after 150 days, the acidity and acid number of fat of the flour composite increased about 1,7 and 4,2 times, respectively, the acidity and acid number of fat of whole oat flour about 2,9 and 6,3 times respectively. Also, the changes in the studied quality indicators were affected by the storage temperature and the method of product packaging. It was established that the addition of dried lingonberry fruit powder containing natural antioxidants into the flour composite, led to a decrease in the acidity growth rate of the flour composite about 1,5 times and the acid number of fat about 1,3 times during storage compared to the whole oat flour. It is recommended to use hermetically sealable bags made of food-grade polyethylene or other edible polymeric materials as a container for storing the flour composite.

scholarly journals The Limitations in Current Studies of Organic Fouling and Future Prospects

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 922
Author(s):  
Xianghao Meng ◽  
Shujuan Meng ◽  
Yu Liu
Keyword(s):  
Membrane Fouling ◽  
Separation Efficiency ◽  
Deep Understanding ◽  
Support Vector ◽  
Feed Water ◽  
Source Water ◽  
Future Prospects ◽  
Surrogate Substances ◽  
High Separation ◽  
Selection Of

Microfiltration and ultrafiltration for water/wastewater treatment have gained global attention due to their high separation efficiency, while membrane fouling still remains one of their bottlenecks. In such a situation, many researchers attempt to obtain a deep understanding of fouling mechanisms and to develop effective fouling controls. Therefore, this article intends to trigger discussions on the appropriate choice of foulant surrogates and the application of mathematic models to analyze fouling mechanisms in these filtration processes. It has been found that the commonly used foulant surrogate (sodium alginate) cannot ideally represent the organic foulants in practical feed water to explore the fouling mechanisms. More surrogate foulants or extracellular polymeric substance (EPS) extracted from practical source water may be more suitable for use in the studies of membrane fouling problems. On the other hand, the support vector machine (SVM) which focuses on the general trends of filtration data may work as a more powerful simulation tool than traditional empirical models to predict complex filtration behaviors. Careful selection of foulant surrogate substances and the application of accurate mathematical modeling for fouling mechanisms would provide deep insights into the fouling problems.

New Electrically Heated and Bird-Strike-Resistant Polymer Glazing for Aircraft

2018 ◽  
Vol 45 (5) ◽  
pp. 231-236
Author(s):  
E.N. Kablov ◽  
L.V. Semenova ◽  
V.A. Bogatov ◽  
I.V. Mekalina ◽  
A.G. Krynin ◽  
...  
Keyword(s):  
Polymeric Material ◽  
Polymer Material ◽  
Polymeric Materials ◽  
Bird Strike ◽  
Conductive Coating ◽  
Selection Of

The main stages in the development of a bird-strike-resistant heated curved organic laminate for aircraft glazing are described: the selection of the polymeric materials; the application of a heated coating to the polymeric material; the moulding of glazing elements; the application of leads to the conductive coating; autoclave pressing of the laminated polymer material.

For Your Information: May 2005

2005 ◽  
Vol 98 (9) ◽  
pp. 639-642
Keyword(s):  
Mathematics Education ◽  
Historical Context ◽  
Research And Practice ◽  
A Current ◽  
Selection Of

The authors were charged to develop a volume containing classic works from research conducted in mathematics education. To complete this task, they collected nominations and opinions from numerous sources to supplement their own knowledge about the field. This process resulted in the selection of seventeen articles. Each article, published in its original format, is preceded by a one–page perspective written by a current researcher that places the article in its historical context and discusses its importance and effect on later research and practice.

scholarly journals Prediction of selective inhibition of neuraminidase from various influenza virus strains by potential inhibitors

2016 ◽  
Vol 62 (6) ◽  
pp. 691-703 ◽  
Author(s):  
A.V. Mikurova ◽  
A.V. Rybina ◽  
V.S. Skvortsov
Keyword(s):  
Influenza Virus ◽  
3D Structure ◽  
Selective Inhibition ◽  
Regression Equations ◽  
Independent Variables ◽  
3D Data ◽  
Ic50 Values ◽  
Potential Inhibitors ◽  
Virus Strains ◽  
Selection Of

A universal model of inhibition of neuraminidases from various influenza virus strains by a particular has been developed. It is based on known 3D data for neuraminidases from three influenza virus strains (A/Tokyo/3/67, A/tern/Australia/G70C/75, B/Lee/40) and modeling of 3D structure of neuraminidases from other strains (A/PR/8/34 and A/Aichi/2/68). Using docking and molecular dynamics, we have modeled 235 enzyme-ligand complexes for 185 compounds with known IC50 values. Selection of final variants among three results obtained for each enzyme-ligand pair and calculation of independent variables for generation of linear regression equations was performed using MM-PBSA/MM-GBSA. This resulted in the set of equations individual strains and the equations pooling all the data. Thus using this approach it is possible to predict inhibition for neuraminidase from each of the considered strains by a particular inhibitor and to predict the range of its action on neuraminidases from various influenza virus strains.

scholarly journals Fabrication 3d Tissue Engineering Scaffold Poly(Ethylene) Diacrylate Filled with Aramid Nanofiber: Mechanical Evaluation and Toxicity

2019 ◽  
Vol 8 (12) ◽  
pp. 1997-2006
Keyword(s):  
Tissue Engineering ◽  
3D Printing ◽  
3D Structure ◽  
Tissue Engineering Scaffold ◽  
Digital Light Processing ◽  
Technical Requirements ◽  
Preliminary Study ◽  
Poly Ethylene ◽  
3D Printing Technique ◽  
Selection Of

The selection of the optimum scaffold fabrication method becomes challenging due to a variety of manufacturing methods, existing biomaterials and technical requirements. Although, Digital light processing (DLP) 3D printing process is one of the SLA techniques which commonly used to fabricate tissue engineering scaffold, however, there is no report published on the fabrication of tissue engineering scaffold-based PEGDA filled with Aramid Nanofiber (ANFs). Hence, the feasible parameter setting for fabricating this material using DLP technique is currently unknown. This work aims to establish the feasible setting parameter via DLP 3D printing to fabricate PEGDA/ANFs 3D tissue engineering scaffold. Preliminary study has been done to identify the accurate composition and curing time setting in producing scaffold. In this work, the researcher has proved the potential and capability of these novel composition biomaterial PEGDA/ANFs to be print via DLP-3D printing technique to form a 3D structure which is not yet been established and has not reported elsewhere.

Management of Patients Refractory to Platelet Transfusion

2003 ◽  
Vol 127 (4) ◽  
pp. 409-414 ◽  
Author(s):  
Ronald A. Sacher ◽  
Thomas S. Kickler ◽  
Charles A. Schiffer ◽  
Laurence A. Sherman ◽  
Arthur W. Bracey ◽  
...  
Keyword(s):  
Task Force ◽  
Practical Approach ◽  
Management Problem ◽  
Diagnosis And Management ◽  
Current Assessment ◽  
The Subject ◽  
A Current ◽  
Contemporary Approach ◽  
Selection Of ◽  
Platelet Transfusions

Abstract Objective.—To present a current assessment and practical approach to the diagnosis and management of patients who are refractory to platelet transfusions. Design.—A task force was convened by the College of American Pathologists under the auspices of the Transfusion Medicine Resource Committee for the purposes of outlining current concepts in the definition and diagnosis of this difficult clinical management problem and selection of the optimal platelet component for these patients. Results.—This article represents a contemporary approach to the diagnosis and management of patients who are refractory to platelet transfusions. This document is based on a current literature review and dialog among members of the task force convened to address the subject. Conclusions.—It is hoped that this document will represent a resource and practical approach to the issue of diagnosis and management of patients who are refractory to platelet transfusions.

Study of the Effect of Composite Fillers on the Rheological Properties of Polymers to Create a Biodegradable Film

2020 ◽  
Vol 24 (3) ◽  
pp. 29-33
Author(s):  
N.E. Pavlovskaya ◽  
I.V. Gorkova ◽  
A.Yu. Gavrilova ◽  
I.N. Gagarina
Keyword(s):  
Sugar Beet ◽  
Polymeric Materials ◽  
Sugar Beet Pulp ◽  
Biodegradable Films ◽  
Factors Affecting ◽  
Wheat Grains ◽  
The Matrix ◽  
Beet Pulp ◽  
Quality Dispersion ◽  
Selection Of

The modern aspects of some rheological characteristics of polymeric materials obtained using starch of substandard wheat grains and sugar beet pulp are considered. The main factors affecting mixing are discussed, which ensures high-quality dispersion and distribution of particles in the matrix in order to obtain a homogeneous mixture and the required properties of biopolymers. A study on the selection of the percentage ratio of fillers (starch and sugar beet pulp) allowed us to develop compositions for biodegradable films. The main objective of the research is to reduce the biodegradation period of polymeric material based on starch from substandard wheat grains and sugar beet pulp.

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