scholarly journals Hygienic Perspectives of Wood in Healthcare Buildings

Hygiene ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 12-23
Author(s):  
Muhammad Tanveer Munir ◽  
Hélène Pailhoriès ◽  
Florence Aviat ◽  
Didier Lepelletier ◽  
Patrice Le Pape ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Moisture Content ◽  
Surface Treatment ◽  
Smooth Surface ◽  
Antimicrobial Properties ◽  
Physical Structure ◽  
Decision Makers ◽  
Antimicrobial Potential ◽  
Microbial Survival ◽  
Wood Age

Wood materials are being adopted as nature-based architectural themes inside the healthcare buildings. Concern is raised that the organic and porous character of wood might support microbial survival. Therefore, this review discusses the hygienic properties of wood including the antimicrobial potential and its cleanability in comparison to smooth surface materials. In general, wood has antimicrobial properties owing to its chemical composition and physical structure. However, the hygienic potential of wood is influenced by the type of wood, age of wood, the cleaning method, surface treatment, and its moisture content. This information is intended to guide decision-makers regarding the use of wood in hygienically sensitive places and researchers to help them identify the variables for better utilizing the hygienic potential of this material.

scholarly journals Testing the Antimicrobial Characteristics of Wood Materials: A Review of Methods

Antibiotics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 225 ◽  
Author(s):  
Muhammad Tanveer Munir ◽  
Hélène Pailhories ◽  
Matthieu Eveillard ◽  
Mark Irle ◽  
Florence Aviat ◽  
...  
Keyword(s):  
Wood Species ◽  
Antimicrobial Properties ◽  
The Other ◽  
Future Research ◽  
Knowledge Gaps ◽  
Wood Material ◽  
Antimicrobial Potential ◽  
Microbial Survival ◽  
Bacteria And Fungi ◽  
Inert Surfaces

Some wood species have antimicrobial properties, making them a better choice over inert surfaces in certain circumstances. However, the organic and porous nature of wood raises questions regarding the use of this material in hygienically important places. Therefore, it is reasonable to investigate the microbial survival and the antimicrobial potential of wood via a variety of methods. Based on the available literature, this review classifies previously used methods into two broad categories: one category tests wood material by direct bacterial contact, and the other tests the action of molecules previously extracted from wood on bacteria and fungi. This article discusses the suitability of these methods to wood materials and exposes knowledge gaps that can be used to guide future research. This information is intended to help the researchers and field experts to select suitable methods for testing the hygienic safety and antimicrobial properties of wood materials.

Extraction of Essential Oils from Medicinal Plants and their Utilization as Food Antioxidants

2020 ◽  
Vol 26 (5) ◽  
pp. 519-541 ◽  
Author(s):  
Giovanna Ferrentino ◽  
Ksenia Morozova ◽  
Christine Horn ◽  
Matteo Scampicchio
Keyword(s):  
Chemical Composition ◽  
Medicinal Plants ◽  
Beneficial Effect ◽  
Essential Oils ◽  
Bioactive Compounds ◽  
Antimicrobial Properties ◽  
Food Products ◽  
Human Diseases ◽  
Present Review ◽  
Green Technologies

Background: The use of essential oils is receiving increasing attention worldwide, as these oils are good sources of several bioactive compounds. Nowadays essential oils are preferred over synthetic preservatives thanks to their antioxidant and antimicrobial properties. Several studies highlight the beneficial effect of essential oils extracted from medicinal plants to cure human diseases such as hypertension, diabetes, or obesity. However, to preserve their bioactivity, the use of appropriate extraction technologies is required. Method: The present review aims to describe the studies published so far on the essential oils focusing on their sources and chemical composition, the technologies used for their recovery and their application as antioxidants in food products. Results: The review has been structured in three parts. In the first part, the main compounds present in essential oils extracted from medicinal plants have been listed and described. In the second part, the most important technologies used for extraction and distillation, have been presented. In detail, conventional methods have been described and compared with innovative and green technologies. Finally, in the last part, the studies related to the application of essential oils as antioxidants in food products have been reviewed and the main findings discussed in detail. Conclusions: In summary, an overview of the aforementioned subjects is presented by discussing the results of the most recent published studies.

Comparative Study on Compositions of Oil-Water Transition Layer before and after ClO2-Treatment Process

2013 ◽  
Vol 652-654 ◽  
pp. 749-752
Author(s):  
Dan Dan Yuan ◽  
Hong Jun Wu ◽  
Hai Xia Sheng ◽  
Xin Sui ◽  
Bao Hui Wang
Keyword(s):  
Chemical Composition ◽  
Transition Layer ◽  
Solid Phase ◽  
Settling Tank ◽  
Physical Structure ◽  
Solid Particles ◽  
Viscosity Reduction ◽  
Insoluble Residue ◽  
Before And After ◽  
Oil Water

In order to meet the need of separating oil from water in the settling tank of the oilfield, ClO2 treatment for oil-water transition layer in settling tank is introduced. The field test displayed that the technique was achieved by a good performance. For understanding the oxidation and mechanism, compositions of oil-water transition layer were comparatively studied for before/after ClO2-treatment in this paper.The experimental results show that the compositions before and after ClO2-treatment, including physical structure and chemical composition, were varied in the great extension. The physical structure, consisting of water, oil and solid phase, was reduced to less than 5% of water and 0.5% of solid particle and increased to 95% of oil in layer compared with before-treatment, easily leading to clearly separating water from oil. The chemical composition of iron sulfide and acid insoluble substance in solid phase was decreased to more than 90% while the carbonate was reduced more than 70% . After the treatment, the viscosity reduction of the water phase in the layer was reached to 50% after oxidation demulsification with ClO2. The chemistry was discussed based on the principles and experiments. Due to ClO2 destroying (oxidizing) the rigid interface membrane structure which is supported by natural surfactant, polymer and solid particles with interface-active materials, the action accelerates the separating of water and oil and sedimentation of insoluble residue of acid in the layer. By demonstrating the experimental data and discussion, we can effectively control the oxidation performance of chlorine dioxide, which is very meaningful for oilfield on the aspect of stable production of petroleum.

Analysis of Physical Structure and Chemical Composition of Oil-Water Transition Layer in Oil Gathering and Transportation System

2013 ◽  
Vol 652-654 ◽  
pp. 2566-2569
Author(s):  
Dan Dan Yuan ◽  
Hong Jun Wu ◽  
Hai Xia Sheng ◽  
Bao Hui Wang ◽  
Xin Sui
Keyword(s):  
Chemical Composition ◽  
Transition Layer ◽  
Suspended Solids ◽  
Solid Phase ◽  
Freezing Point ◽  
Analytical Data ◽  
Transportation System ◽  
Physical Structure ◽  
Efficient Treatment ◽  
Oil Water

he existence of oil-water transition layer brings a great trouble to the dehydration of oil gathering and transportation system. It leads to raising the electric current of dehydrator and becoming worse of the deoiling and dehydrating properties of the treatment equipment, resulting in the serious influences on oil recovery. For the efficient treatment of the transition layer, it is necessary clearly to understand the structure and composition of the layer. In this paper, the physical structure and chemical composition of the layer were systematically, layer by layer and phase by phase, analyzed by modern instrumental methods The results show that (1）the layer is an emulsion which is composed of oil, water and suspended solids. The water phase has characteristics of weak alkaline，high salinity and viscous polymer. The oil phase contains many natural emulsifiers such as colloid, asphaltene and so on. The solid phase mainly concludes FeS particle which plays a decisive role in suspended solids; (2) the typical transition layer is composed of water and oil which accounts for above 90%, the content of solid impurity, which controls the emulsion of the layer, is less than 10%. Compared with oil phase, the water content of typical transition layer is larger with the density of 0.9~1.0 g/L and high freezing point. The analytical data can be adopted for the treatment of oil-water transition layer and smoothly run operations for oil gathering and transportation.

Chemical Composition, Antioxidant and Antimicrobial Properties of Essential Oil and Extracts fromHeracleum sphondyliumL.

2016 ◽  
Vol 19 (4) ◽  
pp. 944-953 ◽  
Author(s):  
Jelena S. Matejic ◽  
Ana M. Dzamic ◽  
Tatjana Mihajilov-Krstev ◽  
Mihailo S. Ristic ◽  
Vladimir N. Randelovic ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Antimicrobial Properties

scholarly journals Pickle and Chutney Development from Fresh Hog Plum (Spondias dulcis)

2013 ◽  
Vol 5 (2) ◽  
pp. 67-72
Author(s):  
MHR Bhuiyan
Keyword(s):  
Chemical Composition ◽  
Vitamin C ◽  
Moisture Content ◽  
Salt Concentration ◽  
Storage Stability ◽  
Sugar Concentration ◽  
Initial Concentration ◽  
Overall Acceptability ◽  
Similar Product ◽  
Hog Plum

The experiment was conducted to develop pickle and chutney from fresh hog plum fruit. The pickle was made with 5%, 10%, 15% and 20% salt concentration. The chutneys were made with 25%, 30%, 35% and 40% sugar concentration. Among them, the best pickle and chutney was identified on the basis of overall acceptability. The study showed that the color, flavor, texture and overall acceptability of different pickles and the chutneys were different. The pickle (P15) made with 15% salt and the chutney (C40) made with 40% sugar concentration was best among others of the similar product. Higher concentration of sugar and salt gives higher acceptability for chutney and pickle, respectively. Among different changes in chemical composition, moisture and vitamin C concentration were prominent during preparation of pickle and chutney. The moisture content was 59.69% and 43.08% for pickle and chutney respectively which were nearly two third to half of the initial concentration of fresh hog plum fruit. The storage stability was studied for both the products and it is seen that chutney (4 month) was lower than storage stability of pickle (5 month).DOI: http://dx.doi.org/10.3329/jesnr.v5i2.14604 J. Environ. Sci. & Natural Resources, 5(2): 67-72 2012

scholarly journals Chemical composition, antimicrobial activity and biological properties of essential oils

2015 ◽  
Vol 9 (2) ◽  
pp. 9-13 ◽  
Author(s):  
Amir Hossein Saeidnejad ◽  
Peyman Rajaei
Keyword(s):  
Chemical Composition ◽  
Medicinal Plants ◽  
Essential Oil ◽  
Essential Oils ◽  
Antimicrobial Properties ◽  
Biological Properties ◽  
Antioxidant Agents ◽  
Ancient Times ◽  
High Concentrations ◽  
Oil Repellent

Essential oils constitute a heterogeneous collection of chemical compounds. Their main characteristics are that they all synthesized by plants and are volatile and mostly soluble in ethanol. They have traditionally been obtained from plants and they have been widely used for insecticidal, medicinal and cosmetic purposes. Essential oils contains about 20–60 components at quite different concentrations and they are characterized by two or three major components at fairly high concentrations. Lately, the essential oils and various extracts of plants have gained special interest as sources of natural antimicrobial and antioxidant agents because of the resistance to antibiotics that some microorganisms have acquired and the possible toxicities of the synthetic antioxidants. Spices consumed daily in different types of food to improve flavors, since ancient times, are well known for their antioxidant and antimicrobial properties. During recent decades, numerous numbers of plants have been monitored for their possible role as repellents and insecticides. In this review, the chemical composition profile of some important medicinal plants was evaluated, then antimicrobial properties of a number of essential oils was compared. Antioxidant activity of some essential oils was also considered. Finally, essential oil repellent properties an an important characteristics was evaluated. Further investigation for available data related to the other biological properties of medicinal plants essential oil is recommended.DOI: http://dx.doi.org/10.3126/ijls.v9i2.12043 International Journal of Life Sciences 9 (2) : 2015; 9-13

scholarly journals Sorption Characteristics of Bulgarian Penny Buns (Boletus Edulis)

2020 ◽  
Vol 180 ◽  
pp. 03008
Author(s):  
Albena Durakova
Keyword(s):  
Chemical Composition ◽  
Moisture Content ◽  
Model Assessment ◽  
Physico Chemical ◽  
Bet Model ◽  
Monolayer Moisture Content ◽  
Desorption Isotherms ◽  
Monolayer Moisture ◽  
Model Linearization ◽  
Sorption Characteristics

The present study determined the sorption characteristics of Bulgarian penny buns (Boletus) for eight water activities in the 10 % 90 % range and at three temperatures, of 10 °С, 25 °С and 40 °С. The coefficients of the modified Oswin, Chung-Pfost, Halsey and Henderson models were obtained statistically. The modified Halsey model is recommended as a description of adsorption and desorption isotherms since it corresponds to the criteria for model assessment and suitability. Via BET model linearization, the values of the monolayer moisture content for water activity of aw > 0.5 and temperatures of 10 °С, 25 °С and 40 °С were established. The approximate physico-chemical composition of Bulgarian penny buns (Boletus) – moisture content – 10.80 %, protein – 32.23 %, carbohydrate 0.99 %, fat – 6.62 %, ashes – 6.20 % - was also determined.

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