Synthesis and Investigation of Mass Spectra of 3-(substituent)-benzopyran[3.2-c]-[1]-benzopyran-6,7-diones

I. M. EI-Deen,H.K. Ibrahim Korean Chemical Society 2003 대한화학회지 Vol.47 No.2

3-하이드록시 벤조피란[3,2-c]-[1]-벤조피란-6,7-다이온(3)과 3-메톡시카보닐쿠마린을 소듐 메톡사이드 존재하에 화합물 1과 레조시놀을 축합시켜 합성하였으며 화합물 3의 아세트산 무수물, 알킬 할라이드, 다이아조니움 클로라이드와의 반응성에 대해 기술하였다. 화합물 4,5오 6a,b의 EI 질량분석에서는 89, 280, 91, 120 들의 주된 봉우리들이 각각의 분열 결과로 얻어짐을 볼 수 있었다. 화합물 3, 6b, 7a의 분자이온 봉우리로써 280, 366, 488을 각각 관찰할 수 있었다. 화합물 7a에서는 383과 77의 두 개의 안정한 조각을 가지는 특징적인 분역형태를 얻었다. 3-Hydroxybenzopyran[3,2-c]-[1]-benzopyran-6,7-diones (3) and 3-methoxycarbonylcoumarin (4) were prepared via condensation of 1 with resorcinol in the presence of sodium methoxide. The chemical behavior of 3 towards acetic anhydride, alkyl halides and diazonium chloride is described. The electron impact ionization mass spectra of compounds 4,5 and 6a,b show a weak molecular ion peak and a base peak of m/z 89, m/z 280. m/z 91 and m/z 120 resulting from a cleavage fragmentation respectively. The molecular ion of compounds 3, 6b, and 7a is a base peak of m/z 280, m/z 366 and m/z 488 respectively. Compound 7a give a characteristic fragmentation pattern with a two very stable fragmentation of m/z 383 and m/z 77.

Estimating the degradation of methylethionium chloride dye on nanotubular TiO2 structure

K.M. Deen,A. Farooq,M.A. Raza,R. Ahmad,W. Haider 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-

In this study the photocatalytic behavior of as-anodized and heat treated surfaces of Ti6Al4V wasinvestigated electrochemically in methylethionium chloride solution in dark and under illumination at60Wand 100 W. X-ray diffraction pattern of as-anodized surface revealed oxygen deficient Ti6O phase,which was converted to rutile/anatase phases by heat treatment in air. Potentiodynamic scans showedvariation in current density during anodic polarization due to the electronic traps within sub-bandenergy states by the amorphous nature of as formed structure hence lower catalytic activity than heattreatedspecimen. Impedance spectroscopy of heat-treated surface in dye solution under dark and lightdepicted lower charge transfer resistance, recombination admittance and higher charge transfercoefficient than as-anodized. The UV–vis spectroscopy of heat treated TiO2 nanotubular structurerepresented 45.05% photocatalytic efficiency.

Electrochemical characterization and thermodynamic tendency of β-Lactoglobulin adsorption on 3D printed stainless steel

M.J.K Lodhi,K.M. Deen,Zia Ur Rahman,Ameeq Farooq,Waseem Haider 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-

The electrochemical behavior of 3D printed 316L stainless steel (3DPSS) was investigated in phosphate buffer saline (PBS), containing β-Lactoglobulin (BLG). The charge transfer resistance (Rct) was decreased from 629 to 40 k Ω cm2 with an increase in temperature from 293 to 323 K in BLG free electrolyte. At each temperature, the exponential decrease in the polarization resistance (Rp) of 3DPSS was a function of BLG concentration. The significant decrease in activation energy ‘Ea’ (∼15 kJ mol−1) upon adding 0.06 g/L BLG attributed to the charge transfer process involved in the adsorption process. The results were further used to quantify the thermodynamic parameters.

NiCu bimetallic nanoparticle-decorated graphene as novel and cost-effective counter electrode for dye-sensitized solar cells and electrocatalyst for methanol oxidation

Motlak, M.,Barakat, N.A.M.,El-Deen, A.G.,Hamza, A.M.,Obaid, M.,Yang, O.B.,Akhtar, M.S.,Khalil, K.A. Elsevier 2015 Applied Catalysis A Vol.501 No.-

NiCu bimetallic nanoparticle-decorated graphene was prepared by hydrothermal treatment to be utilized as an efficient and alternative Pt-free counter electrode (CE) for dye-sensitized solar cells (DSSCs). The results indicated that the performance of the introduced modified graphene as CE strongly depends on the composition of the metallic nanoparticles. Typically, Ni-, Ni<SUB>0.25</SUB>Cu<SUB>0.75</SUB>-, Ni<SUB>0.6</SUB>Cu<SUB>0.4</SUB>- and Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB>-decorated graphene were synthesized. Investigation of the electrochemical characteristics indicated that the graphene decorated by Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB> nanoparticles shows the highest catalytic activity and conductivity compared to the other prepared formulations as well as pristine graphene. In DSSC, Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB> nanoparticle-decorated graphene can remarkably improve the catalytic activity toward triiodide reduction and lower the resistance at the electrolyte-CE interface. Accordingly, the obtained energy conversion efficiencies were 1.72%, 2.39%, 1.24%, 2.87% and 5.1% for pristine, Ni-, Ni<SUB>0.25</SUB>Cu<SUB>0.75</SUB>-, Ni<SUB>0.6</SUB>Cu<SUB>0.4</SUB>- and Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB>-decorated graphene, respectively. The obtained efficiency for Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB>-decorated graphene is comparable with Pt-based DSSC fabricated by the same procedure (5.9%) which recommends exploiting the introduced modified graphene as efficient and cost-effective CE for the large-scale fabrication of photovoltaic devices. The catalytic performance of the best formulation was examined toward methanol electrooxidation; the results indicated effective and stable electrocatalytic activity.

Employing Laccase-Producing Aspergillus sydowii NYKA 510 as a Cathodic Biocatalyst in Self-Sufficient Lighting Microbial Fuel Cell

( Yomna K. Abdallah ),( Alberto T. Estevez ),( Diaa El Deen M. Tantawy ),( Ahmad M. Ibraheem ),( Neveen M. Khalil ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.12

In the present work, we isolated and identified Aspergillus sydowii NYKA 510 as the most potent laccase producer. Its medium constituents were optimized to produce the highest possible amount of laccase, which was after 7 days at 31℃ and pH 5.2. Banana peel and peptone excelled in inducing laccase production at concentrations of 15.1 and 2.60 g/l, respectively. Addition of copper sulfate elevated enzyme yield to 145%. The fungus was employed in a microbial fuel cell (MFC). The best performance was obtained at 2000 Ω achieving 0.76 V, 380 mAm^-2, 160 mWm^-2, and 0.4 W. A project to design a self-sufficient lighting unit was implemented by employing a system of 2 sets of 4 MFCs each, connected in series, for electricity generation. A scanning electron microscopy image of A. sydowii NYKA 510 was utilized in algorithmic form generation equations for the design. The mixed patterning and patterned customized mass approach were developed by the authors and chosen for application in the design.

Validity of the estimates of oral cholera vaccine effectiveness derived from the test-negative design

Ali, M.,You, Y.A.,Sur, D.,Kanungo, S.,Kim, D.R.,Deen, J.,Lopez, A.L.,Wierzba, T.F.,Bhattacharya, S.K.,Clemens, J.D. Butterworths ; Elsevier Science Ltd 2016 Vaccine Vol.34 No.4

Background: The test-negative design (TND) has emerged as a simple method for evaluating vaccine effectiveness (VE). Its utility for evaluating oral cholera vaccine (OCV) effectiveness is unknown. We examined this method's validity in assessing OCV effectiveness by comparing the results of TND analyses with those of conventional cohort analyses. Methods: Randomized controlled trials of OCV were conducted in Matlab (Bangladesh) and Kolkata (India), and an observational cohort design was used in Zanzibar (Tanzania). For all three studies, VE using the TND was estimated from the odds ratio (OR) relating vaccination status to fecal test status (Vibrio cholerae O1 positive or negative) among diarrheal patients enrolled during surveillance (VE= (1-OR)x100%). In cohort analyses of these studies, we employed the Cox proportional hazard model for estimating VE (=1-hazard ratio)x100%). Results: OCV effectiveness estimates obtained using the TND (Matlab: 51%, 95% CI:37-62%; Kolkata: 67%, 95% CI:57-75%) were similar to the cohort analyses of these RCTs (Matlab: 52%, 95% CI:43-60% and Kolkata: 66%, 95% CI:55-74%). The TND VE estimate for the Zanzibar data was 94% (95% CI:84-98%) compared with 82% (95% CI:58-93%) in the cohort analysis. After adjusting for residual confounding in the cohort analysis of the Zanzibar study, using a bias indicator condition, we observed almost no difference in the two estimates. Conclusion: Our findings suggest that the TND is a valid approach for evaluating OCV effectiveness in routine vaccination programs.

Effect of Pseudomonas aeruginosa Strain ZK Biofilm on the Mechanical and Corrosion Behavior of 316L Stainless Steel and α-brass

Farooq, A.,Zubair, M.,Wadood, H.Z.,Deen, K.M. The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.4

This research work aims to investigate the effect of the aerobic bacterium, Pseudomonas aeruginosa on the mechanical and electrochemical properties of the 316L stainless steel and α-brass. These properties of both the alloys were determined after 7 days of exposure to the controlled and inoculated media at 37℃. The microstructural and electrochemical test results revealed the deleterious effects of Pseudomonas aeruginosa. After exposure to the inoculated medium, the scanning electron microscopy (SEM) results showed the larger pitting and formation of relatively dense biofilm on α-brass compared to 316L stainless steel. The tensile strength and hardness of 316L stainless steel were slightly affected after exposure to the controlled and inoculated media. After exposure to the controlled medium and inoculated media, the tensile strength of the α-brass was least affected but a significant decrease in the hardness (from 165 HV to 124 HV) was observed due to the severe attack induced by the Pseudomonas aeruginosa. Similarly, the open-circuit potential of the 316L stainless steel in the inoculated medium was measured to be less active (-410 mV vs Ag/AgCl) than α-brass (-550 mV vs Ag/AgCl). In the inoculated medium, potentiodynamic polarization curves confirmed the severe attack of Pseudomonas aeruginosa on α-brass (7.15 × 10^-2 mm/year) compared to 316L stainless steel which registered a corrosion rate of 5.14 × 10^-4 mm/year.

Analysis of organochlorine pesticides residues in fish from Edko Lake (North of Egypt) using eco-friendly method and their health implications for humans

Abbassy Moustafa A.,Khalifa Moustafa A.,Nassar Atef M. K.,El-Deen Eman E. Nour,Salim Yehia M. 한국독성학회 2021 Toxicological Research Vol.37 No.4

Levels of organochlorine pesticides (OCPs) residues in tilapia fish and their health risk associated with the consumption of fish from Edko lake, Egypt were determined. The quick, easy, cheap, effective, rugged, and safe method (QuEChERS) was used for extraction and clean-up of 18 OCPs residues from fish followed by GC-ECD and GC-ITD analytical tools were employed for identification of OPs. Out of the 18 OCPs, only heptachlorepoxide, p,p-DDE, dieldrin, p,p-DDD, and endrin ketone were detected in muscles of fish with concentrations of 0.1144, 0.2119, 0.4352, 0.1196, and 0.1323 μg/Kg bw, respectively. Results of the risk assessment calculations showed that dieldrin had a health risk index of more than one. This means that there was a health risk to adults associated with the consumption of fish. On the other hand, heptachlorepoxide, p,p-DDE, p,p-DDD, and endrin ketone did not show any direct health risk. Contamination of fish, collected from Edko lake in Egypt, with residues of OCPs might pose health implications if fish were consumed fresh.