scholarly journals Factors affecting the production and measurement of hydrogen peroxide in honey samples

2021 ◽  
Author(s):  
Annabel Guttentag ◽  
Krishothman Krishnakumar ◽  
Nural Cokcetin ◽  
Elizabeth Harry ◽  
Dee Carter
Keyword(s):  
Hydrogen Peroxide ◽  
Antibacterial Activity ◽  
Screening Tool ◽  
Antimicrobial Properties ◽  
Rapid Loss ◽  
Factors Affecting ◽  
Highly Active ◽  
Production Of Hydrogen ◽  
Almost All ◽  
The Relationship

Many Australian native honeys possess significant antimicrobial properties due to the production of hydrogen peroxide (H2O2) by glucose oxidase, an enzyme derived from the honeybee. The level of H2O2 produced in different honey samples is highly variable, and factors governing its production and stability are not well understood. In this study, highly active Australian honeys that had been stored for >10 years lost up to 54 % of their antibacterial activity, although almost all retained sufficient activity to be considered potentially therapeutically useful. We used a simple colourimetric assay to quantify H2O2 production. Although we found a significant correlation between H2O2 production and antibacterial activity across diverse honey samples, variation in H2O2 only explained 47 % of the variation observed in activity, limiting the assay as a screening tool and highlighting the complexity of the relationship between H2O2 and the killing power of honey. To further examine this, we tested whether H2O2 detection in honey was being inhibited by pigmented compounds and if H2O2 might be directly degraded in some honey samples. We found no correlation between H2O2 detection and honey colour. Some honey samples rapidly lost endogenous and spiked H2O2, suggesting that components in honey, such as catalase or antioxidant polyphenols, may degrade or quench H2O2. Despite this rapid loss of H2O2, these honeys had significant peroxide-based antibacterial activity, indicating a complex relationship between H2O2 and other honey components that may act synergistically to augment activity.

scholarly journals Isolation of Actinomycetes from Different Soil Sample (NCR Region) & Screening their Antibacterial Activity Against E.Coli and Bacillus

2021 ◽  
Vol 9 (VII) ◽  
pp. 1461-1464
Author(s):  
Ritu Sharma
Keyword(s):  
Antibacterial Activity ◽  
Soil Sample ◽  
Culture Media ◽  
Test Organism ◽  
Inhibition Zone ◽  
Essential Medicines ◽  
Resistant Bacteria ◽  
Alkaline Soil ◽  
Highly Active ◽  
Almost All

In the extant study, the soil samples were gathered up from NCR region. A total 9 Actinomycetes strains were isolated from the NCR. These Actinomycetes had been cloistered with respect to capability against Gram-positive and Gram-negative bacteria. Soil sample was isolated for their antibacterial activity. They were assess for their constraint activities on 2 test organism. The culture characteristics of screened bacteria were also studies in non-identical culture media. The results specify that 9 Actinomycetes isolates were highly active against E. Coli, and Bacillus strains. 9 Actinomycetes isolates were extremely vigorous with an inhibition zone more than 16 mm in diameter. All the antibiotics producing actinomycetes were isolated at 28 °C from soil sample. 9 Actinomycetes isolates showed activity against bacteria in which chiefly from alkaline soil. Where the less intervention by human for agriculture or other purpose. These Micro-organisms may have capability to produce powerful & essential medicines factories. Most of bacteria have elaborated resistance to almost all antibiotics. An infamous instance of multi-resistant bacteria is the ‘hospital superbug’, MRSA. Seeking of new antibiotics has become an aqueduct against time.

scholarly journals Comparison of Antibacterial Activity ofLactobacillus plantarumStrains Isolated from Two Different Kinds of Regional Cheeses from Poland: Oscypek and Korycinski Cheese

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Aleksandra Ołdak ◽  
Dorota Zielińska ◽  
Anna Rzepkowska ◽  
Danuta Kołożyn-Krajewska
Keyword(s):  
Hydrogen Peroxide ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Broad Spectrum ◽  
Antimicrobial Properties ◽  
Antagonistic Activity ◽  
Antimicrobial Compounds ◽  
E Coli ◽  
Unpasteurized Milk ◽  
Protective Cultures

Oscypek and korycinski are traditional Polish cheeses, exclusively produced in Tatra and in Podlasie region, respectively, produced from raw, unpasteurized milk. The 29Lactobacillus plantarumstrains were isolated on MRS agar from 12 cheese samples and used as a material for study. The main purpose of the work was to assess the antimicrobial properties and recognition of selected strains for the unique antagonistic activity and preservation role in food. It has been found that the highest antimicrobial activity was observed in the case ofL. monocytogenesstrains; however, the level of that activity was different depending on theLb. plantarumstrain. Strains from oscypek produced broad spectrum, and a few strains isolated from korycinski cheese produced a narrow spectrum of antimicrobial compounds, other than organic acids and hydrogen peroxide. Moreover, the antagonistic activity shown byLb. plantarumstrains is connected with the source from which a given strain was isolated. Strains isolated from oscypek cheese represented stronger activity againstL. monocytogenes, whereas strains isolated from korycinski cheese were more active againstE. coli. StrainsLb. plantarumOs13 and Kor14 could be considered as good candidates for protective cultures to extend durability of food products.

Study of the microstructure and antibacterial properties of MgO with doped defects

2018 ◽  
Vol 17 (02) ◽  
pp. 1850018 ◽  
Author(s):  
Dongyun Zhang ◽  
Yaning Lin ◽  
Shenhua Song ◽  
Peixin Zhang ◽  
Hongwei Mi
Keyword(s):  
Salt Lake ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Antibacterial Activities ◽  
Functional Material ◽  
Highly Active ◽  
Antibacterial Material ◽  
The Relationship ◽  
Change Of Microstructure ◽  
Insight Into

In this paper, in order to effectively utilize salt lake magnesium resources, we focused on a functional material containing magnesium, i.e. magnesium oxide, MgO, which is a type of antibacterial material. Through a first-principles study from the atomic level, the microstructure of MgO containing doped point defects of different elements was studied. The relationship between the microscopic structure of the material and its special antibacterial function was explored. The results are as following: the interstitial impurities in MgO are more helpful than substituted impurities for the improvement of the electronic structure. The analysis of the influence of different doping elements on the microstructure confirmed theoretically that Ag and Cu have the same highly active antimicrobial properties with the same change of microstructure, thereby confirming the relationship between microstructure and antimicrobial activity. The results of the simulations match the experimental results, thereby theoretically demonstrating the relationship between defects and antibacterial activities and providing further insight into the nature of the antibacterial mechanism.

scholarly journals An Eco-Friendly Approach to Low-Temperature and Near-Neutral Bleaching of Cotton Knitted Fabrics Using Glycerol Triacetate as an Activator

2021 ◽  
Author(s):  
Yu Zhou ◽  
Guolin Zheng ◽  
Jinfang Zhang ◽  
Qiang Wang ◽  
Man Zhou ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Textile Industry ◽  
Cost Effective ◽  
Knitted Fabrics ◽  
Factors Affecting ◽  
Bleach Activator ◽  
Glycerol Triacetate ◽  
The Relationship ◽  
Environmentally Friendly Approach

Abstract Near-neutral bleaching of cotton fabrics at low temperature is of great importance for saving energy and ecological friendliness in textile industry. In this work, glycerol triacetate (GT) was investigated as an activator of hydrogen peroxide (H2O2) for low temperature bleaching of cotton knitted fabrics, and satisfactory whiteness was obtained. The bleaching properties of H2O2/GT system for cotton was assessed by the CIE whiteness index, H2O2 decomposition rate, concentration of generated peracetic acid (PAA) and bursting strength. Possible factors affecting the performance of H2O2/GT bleaching system were discussed in detail. Adding only 10 mmol/L GT to the hydrogen peroxide solution (60 mmol/L) to bleach cotton knitted fabrics at 60 ℃ for 60 min, the WI was significantly increased from 52.09 to 68.92. By using benzenepentacarboxylic acid as a fluorescent probe for hydroxyl radical (HO·) detection, it was found that GT could clearly promote HO· generation and the concentration of HO· closely related to the WI of cotton fabric. Furthermore, the bleaching mechanism of H2O2/GT system to cotton was proposed by exploring the relationship between WI and HO· concentration. As a bleach activator, GT has more economical benefits and better solubility in water than that of TAED. The H2O2/GT system may provide a cost-effective and environmentally friendly approach as alternative to conventional alkaline high-temperature bleaching of cotton.

The Relationship of Hydrogen Peroxide Exposure Protocol to Bleaching Efficacy

2013 ◽  
Vol 38 (2) ◽  
pp. 177-185 ◽  
Author(s):  
SR Kwon ◽  
PW Wertz ◽  
DV Dawson ◽  
DS Cobb ◽  
G Denehy
Keyword(s):  
Hydrogen Peroxide ◽  
Linear Regression ◽  
Color Change ◽  
Linear Modeling ◽  
Tooth Color ◽  
Factors Affecting ◽  
Pulp Cavity ◽  
Relationship Of ◽  
The Relationship

SUMMARY The purpose of this study was to compare two in-office bleaching methods with respect to tooth color change and level of hydrogen peroxide penetration into the pulp cavity and to evaluate relationships between penetration level and color change. Eighty extracted canines were exposed to two different bleaching regimens (conventional vs sealed bleaching technique). After exposure to 38% hydrogen peroxide gel for one hour, hydrogen peroxide amount was estimated spectrophotometrically. Color change was measured per Commission Internationale de l'Eclairage methodology. Linear regression was used to evaluate factors affecting color change, including bleaching technique. The conventional and sealed bleaching groups showed no difference for any color change parameters (ΔL, Δa, Δb, ΔE); however, there was significantly greater hydrogen peroxide penetration in the conventional bleaching group (p<0.05). Linear modeling of the change in lightness (ΔL) showed that the increase in lightness tended to be greater for teeth with lower initial L* values (r=−0.32, p<0.05). After adjustment for initial L*, there was no evidence that ΔL differed with hydrogen peroxide penetration levels (p>0.05) or bleaching technique (mean group difference in ΔL=0.36; p>0.05).

Contemporary Qur'anic Studies in Iran and its Relationship with Qur'anic Studies in the West

2012 ◽  
Vol 14 (1) ◽  
pp. 45-72
Author(s):  
Morteza Karimi-Nia
Keyword(s):  
Islamic Law ◽  
Human Sciences ◽  
The West ◽  
Communications Technologies ◽  
Religious Learning ◽  
The Status ◽  
Islamic Republic Of Iran ◽  
Almost All ◽  
The Impact ◽  
The Relationship

The status of tafsīr and Qur'anic studies in the Islamic Republic of Iran has changed significantly during recent decades. The essay provides an overview of the state of Qur'anic studies in Iran today, aiming to examine the extent of the impact of studies by Western scholars on Iranian academic circles during the last three decades and the relationship between them. As in most Islamic countries, the major bulk of academic activity in Iran in this field used to be undertaken by the traditional ʿulamāʾ; however, since the beginning of the twentieth century and the establishment of universities and other academic institutions in the Islamic world, there has been increasing diversity and development. After the Islamic Revolution, many gradual changes in the structure and approach of centres of religious learning and universities have occurred. Contemporary advancements in modern sciences and communications technologies have gradually brought the institutions engaged in the study of human sciences to confront the new context. As a result, the traditional Shīʿī centres of learning, which until 50 years ago devoted themselves exclusively to the study of Islamic law and jurisprudence, today pay attention to the teaching of foreign languages, Qur'anic sciences and exegesis, including Western studies about the Qur'an, to a certain extent, and recognise the importance of almost all of the human sciences of the West.

The number of employed as a macroeconomic indicator of working time dynamics

2020 ◽  
Vol 16 (5) ◽  
pp. 935-945
Author(s):  
I.A. Zaikova
Keyword(s):  
Comparative Analysis ◽  
Manufacturing Sector ◽  
Working Hours ◽  
Working Time ◽  
Labor Costs ◽  
Factors Affecting ◽  
Time Dynamics ◽  
Developed Economies ◽  
The Relationship ◽  
Macroeconomic Indicator

Subject. The working time of workers at any stage of economic development is a value reflecting the level of labor productivity. Any progress in productivity contributes to changes in the volume of labor costs and the number of employed. Depending on the relationship between the total volume of labor costs and the number of employed, the duration of working time per one worker may change (it may increase, decrease, or remain unchanged). Objectives. The study aims to confirm the importance of such a macroeconomic indicator as the number of employed in varying working hours. Methods. The study rests on the comparative analysis of countries with developed economies based on some indicators like dynamics of the working time fund, dynamics of the number of employed, average number of hours worked during the year per employee, etc. The analyzed timespan is 25 years (from 1991 to 2016). Results. The comparative analysis revealed that in the non-production sphere and the economy as a whole the macroeconomic determinants correlate so that the length of working time per worker reduces. When considering the analysis results for the manufacturing sector, no single trend was identified. Conclusions. One of the key factors affecting the change in working hours is the number of employed. The relationship between the working time fund and the number of employed directly determines the dynamics of working time per worker.

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