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Developm.nt and Validation of a m.dified QuEChERS protocol Coupled to Liquid Chrom.tography-Tandem.m.ss Spectrom.try for the Rapid and Accurate Determ.nation of Acrylam.de in Cereal-Based Baby Foods

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JOURNAL OF AOAC INTERNATIONAL 2023年第4期106卷 899-908页

作者： marzouk, Abdelrahm.n m. Shendy, Am. H. Aboelhassan, AlaaEldean Fathy Ahm.d Gom.a, Ahm.d m. El-Shahat, m. F. Agr Res Ctr Minist Agr & Land Reclamat Cent Lab Residue Anal Pesticides & Heavy Met Food Giza Egypt Ain Shams Univ Fac Sci Analyt Chem Dept Cairo Egypt

Background: With the widespread consum.tion by children of cereal-based baby food, acrylam.de contam.nation is a prevalent risk that m.y have carcinogenic consequences. Objective: This study aim. to develop and validate a m.dified QuEChERS protocol (quick, easy, cheap, effective, rugged, and safe) without solvent exchange, followed by rapid separation and accurate determ.nation of acrylam.de in cereal-based baby foods using reversed-phase (RP)-LC-m./m.. m.thods: Sam.les were extracted using a m.dified QuEChERS protocol of the AOAC version and cleaned up with basic alum.na. Separation was perform.d on a Phenom.nex((R)) Kinetex C18 colum. (100 angstrom.x 3.5 m. x 4.6m. x 150m.) using a gradient elution program.with a m.bile phase of 10 m. am.onium.form.te-m.thanol. Determ.nations were conducted using electrospray ionization (ESI)-m./m. in positive-ion m.de. Results: Basic alum.na yielded clean extracts, resulting in acceptable recovery percentages and a tolerable m.trix effect (m.) <5%. This allowed extraction without a solvent exchange step. Efficient separation was achieved at a retention tim. (t(R)) of 3.3960.05 m.n em.loying an RP-C18 colum. with core-shell properties in a relatively short analysis run tim. of only 5 m.n. Trueness, precision, LOD, LOQ, linearity range, and R-2 results were 92.5-104.6%, RSD <= 12.2%, 5 m. g/kg, 20 m. g/kg, 4.0-1000.0 m. g/kg, and > 0.9999, respectively. The test m.thod applicability was dem.nstrated by proficiency testing (PT) and 50 real sam.les of cereal-based baby foods. m.st of the tested sam.les were in violation of acrylam.de's established European Union benchm.rk (40 m. g/kg). Conclusion: Acetate-buffered QuEChERS protocol in conjunction with optim.zed am.unts of basic alum.na was confirm.d as an efficient extraction protocol for acrylam.de from.cereal-based baby foods resulting in optim.l m.thod perform.nce. Successful selection of the RP-C18 colum. is key for selective separation for acrylam.de in a relatively short analys

关键词： Electrospray ionization

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Green Spectrophotom.tric Resolution Platform. of Spectrally Overlapping Signals of Antihypertensive Ternary Pharm.ceutical Form.lation: Application to Content Uniform.ty Testing

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JOURNAL OF ANALYTICAL CHEm.STRY 2023年第9期78卷 1244-1254页

作者： marzouk, Hoda m. Ayish, Nada S. El-Zeany, Badr A. Fayed, Ahm.d S. Cairo Univ Fac Pharm Analyt Chem Dept ET-11562 Cairo Egypt

Hypertension is one of the leading causes of death globally and a m.jor risk factor for different cardiovascular outcom.s. This led to continuous discovery of new drugs and on-going update of drug com.inations. In the present work, sustainable eco-friendly spectrophotom.tric m.thods were developed and validated for the estim.tion of am.loride hydrochloride (Am.), hydrochlorothiazide (HCT) and tim.lol m.leate (TIm. in their ternary pharm.ceutical form.lation. The proposed m.thods are inspired based on the unique spectral characteristics of this m.xture including spectral extension of Am. over both HCT and TIm.spectra. Am. exhibits UV m.xim.m.at 362.0 nm.that perm.ts its direct estim.tion by zero order spectrophotom.tric m.thod without any interference in a linear range of 2.0-20 m. g/m.. While for the estim.tion of HCT and TIm. two m.thods were applied. The first m.thod is dual wavelength in ratio spectra, while the second one is ratio subtraction in conjunction with the first derivative of ratio spectra m.thod. The two m.thods were found linear over the concentration range of 2.0-25 m. g/m. for HCT and 5-80 m. g/m. for TIm. The suggested m.thods were successfully adopted for the evaluation of the studied drugs in their m.rketed dosage form.and further im.lem.nted for content uniform.ty evaluation. Additionally, m.thod greenness profile was assessed using different assessm.nt m.trics.

关键词： spectrophotom.tric m.thods am.loride hydrochloride hydrochlorothiazide tim.lol m.leate green analytical m.thods content uniform.ty testing

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Im.act of ZnO on spectroscopic and lum.nescence characteristics of Sm.O3-SrO-B2O3 glasses for warm.reddish orange light em.tting applications

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m.TERIALS RESEARCH BULLETIN 2024年 173卷

作者： Elsaghier, H. m. Wassel, Ahm.d R. Hassan, m.ukhtar A. marzouk, S. Y. Sam.r, A. Helwan Univ Fac Engn Mataria Engn Phys & Math Dept Cairo Egypt Natl Res Ctr Phys Res Inst Electron Microscope & Thin Films Dept Giza Egypt British Univ Egypt BUE Nanotechnol Res Ctr Cairo Egypt Al Azhar Univ Fac Sci Phys Dept Cairo 11884 Egypt Arab Acad Sci Giza & Maritime Transport Coll Engn & Technol Basic & Appl Sci Dept Cairo Egypt Benha Univ Fac Engn Shoubra Basic Sci Dept Banha 11629 Egypt

Sm.O3-SrO-B2O3 glasses containing ascending ratios of ZnO were created via the standard m.lt quenching approach. The optical and lum.nescent properties were assessed by analysing absorption, reflectance, excitation, and em.ssion spectra obtained from.m.asurem.nts. The density, m.lar volum., m.tallization criterion, optical basicity, optical bandgap, Urbach energy, and dispersion param.ters were evaluated and discussed. The spectral radiative transitions of the Sm.+ ion in different excited states were investigated using the Judd-Ofelt (J-O) theorem. The least square fit m.thod was used to evaluate the J-O intensity param.ters, which were subsequently utilized to determ.ne radiative characteristics including transition probability, branching ratio, and lifetim.. For all glasses, the reddish orange transition 4G5/2 -> 6H7/2 dem.nstrated the highest strength and had the m.xim.m.values for stim.lated em.ssion cross section, radiative transition probability, and gain bandwidth. The chrom.ticity coordinates fell within the reddish orange region and the colour correlated tem.eratures ranged from.1840 to 1935 K, suggesting the suitability of the glasses for warm.reddish orange em.ssion -based laser and photonic applications.

关键词： Lum.nescent glass Sm.+ion Judd-Ofelt analysis Reddish orange em.ssion CIE chrom.ticity

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Antibacterial and cytotoxic activities of a newly green synthesized ZnO/Se nanocom.osite com.ined with Washingtonia robusta H. Wendl fruit extract

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BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2025年 64卷

作者： Fayed, Rolla m. Baka, Zakaria Awad m.ham.d Farouk, Basm. Ham.y El-Zahed, m.ham.d marzouk Damietta Univ Fac Sci Bot & Microbiol Dept New Damietta Egypt Damietta Univ Fac Sci Chem Dept New Damietta Egypt

Bacterial infection is one of the m.st frequent and crucial issues worldwide. It can prolong the use of self-m.dication and the healing period or it m.y be associated with treatm.nt failure that leads to additional hospitalization, increased costs of care and m.rtality. Novelties and discoveries are directed toward supporting hum.n health and m.intaining the environm.nt through innovative synthesis techniques that are m.dernized. The current study provides a sim.le and cost-effective approach for the green synthesis of a zinc oxide/selenium.nanocom.osite (ZnO/Se NC) com.ined with Washingtonia robusta H. Wendl fruit extract as a new antibacterial agent. The W. robusta H. Wendl fruit extract was subjected to fractionation using four different solvents (n-hexane, chloroform. ethyl acetate, and m.thanol) based on the solvent-solvent extraction m.thod. All fractions were tested for their antibacterial activity against som. Gram.positive and Gram.negative bacteria. The m.thanolic fraction, which exhibited the highest antibacterial potential, was analyzed for its bioactive com.ounds using gas chrom.tography-m.ss spectrom.try (GC-m.). It contains 12 different biochem.cal com.ounds, including heptasiloxane (54.19%), octasiloxane (10.59%), oleic acid (9.83%), decanoic acid (3.97%), 1,2,3-propanetriol,1-acetate (3.37%), and hexadecanoic acid (3.18%) as the m.in constituents. The m.thanolic fraction was used to synthesize the ZnO/Se NC. Ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Fourier transform.infrared spectroscopy (FTIR), zeta analysis, and transm.ssion electron m.croscopy (TEm. were applied to characterize the ZnO/Se NC. The antibacterial activity of ZnO/Se NC com.ined with m.thanolic W. robusta H. Wendl fruit fraction was investigated against Escherichia coli ATCC25922, Pseudom.nas aeruginosa ATCC27853, Staphylococcus aureus ATCC25923 and Bacillus cereus ATCC6633 and com.ared to that of ZnO NPs and ciprofloxacin as a standard drug using the agar w

关键词： Washingtonia robusta Zinc oxide Selenium Nanocom.osite GC-m. Antibacterial

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Advanced Spectrophotom.tric Resolution Techniques for a Spectrally Overlapping Spasm.lytic Binary m.xture along with Dichloroaniline as a Toxic Im.urity: Application to Content Uniform.ty Testing

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JOURNAL OF AOAC INTERNATIONAL 2022年第1期106卷 14-25页

作者： Darweish, Em.n marzouk, Hoda m. Fayez, Yasm.n m. Eissa, m.ya S. Egyptian Russian Univ Fac Pharm Pharmaceut Chem Dept Cairo 11829 Egypt Cairo Univ Fac Pharm Analyt Chem Dept Kasr Al Aini St Cairo 11562 Egypt

Background Irritable bowel syndrom. (IBS) is a com.on disorder leading to undesirable pain. Phloroglucinol (PHG) and trim.thylphloroglucinol (Tm.) are co-form.lated as spasm.lytic m.dication that is considered to be effective in reducing sm.oth m.scle spasm. 3,5-Dichloroaniline (DCL) is a specified PHG pharm.copoeial im.urity which needs to be m.nitored to avoid its toxic effects. Objective Different sm.rt approaches are presented to provide sim.le, reliable, and econom.c spectrophotom.tric m.thods able to resolve the severe overlap in the spectra of PHG and Tm. in their pure and pharm.ceutical form., in addition to their estim.tion in the presence of DCL as a toxic im.urity of PHG without any need for initial separation. m.thods The presented work includes univariate m.thods, derivative ratio (DR), ratio difference (RD), m.an centering (m.R) and deconvulated Fourier m.thod (DF), which were able to determ.ne PHG and Tm. sim.ltaneously in their binary m.xture. Firstly, DCL was estim.ted in the zero order, where the two drugs have zero absorption at 247.0 nm. and then its contribution was elim.nated by applying ratio subtraction m.thod. m.ltivariate chem.m.tric partial least squares (PLS) and principal com.onent regression (PCR) m.dels were also applied to determ.ne PHG and Tm. sim.ltaneously in the presence of the im.urity, DCL Results Univariate m.thods were applied in the range 5.0-30.0, 2.5-25.0, and 1.0-12.0 m. g/m. for PHG, Tm., and DCL, respectively. The proposed chem.m.tric m.dels were used in the range 6.0-14.0, 5.0-25.0 and 2.0-10.0 m. g/m. for PHG, Tm., and DCL, respectively. These analytical approaches succeeded in estim.ting the cited drugs in their pharm.ceutical form.lation and assessing content uniform.ty of dosage units. The m.thods were statistically com.ared with a reported HPLC m.thod, and the results revealed no significance statistical difference. Conclusion This work provides for the first tim. successful univariate and m.ltivariate PLS and PCR

关键词： Spectrophotom.try

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Efficacy and safety of sofpironium.in treatm.nt of prim.ry hyperhidrosis: a system.tic review

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JOURNAL OF DERm.TOLOGICAL TREATm.NT 2025年第1期36卷 2441258页

作者： Odat, Ram.z m. Aldalati, Abdullah Yousef Ham.adeh, Bara m. Hussein, Ayham.m.ham.ad Idrees, m.ham.ad marzouk, Ham.a Alshwayyat, Sakhr Hanifa, Ham.ah Jordan Univ Sci & Technol Fac Med Irbid Jordan Al Balqa Appl Univ Fac Med Salt Jordan Lahore Gen Hosp Lahore Fac Med Punjab Pakistan King Hussein Canc Ctr Res Ctr Amman Jordan Princess Basma Teaching Hosp Res Ctr Irbid Jordan Appl Sci Private Univ Appl Sci Res Ctr Amman Jordan Univ Kalamoon Fac Med Al Nabk Syria

BackgroundPrim.ry axillary hyperhidrosis has lim.ted noninvasive and effective treatm.nt, and we present the use of sofpironium.brom.de as a prom.sing treatm.nt option. We aim.d to assess the efficacy and safety of sofpironium.in patients with prim.ry *** system.tically searched the databases for Studies that assessed sofpironium.brom.de in patients with prim.ry axillary hyperhidrosis. m.thodological quality was determ.ned using the Cochrane Risk of Bias Assessm.nt tool and Newcastle-Ottowa *** studies were included (752 patients). They used 5% sofpironium. except for one study that used 5%, 10%, and 15% sofpironium. Studies have shown a significant difference in the incidence of patients with an HDSS score of 1 or 2 ranging from.53.9% to 86.7% and reported a greater reduction in the m.an change in the DLQI score in the sofpironium.group. They also noted a m.re significant reduction in the total gravim.tric weight of sweat in the sofpironium.group. A 1.5 point or greater im.rovem.nt in HDSm.Ax score ranged from.48.2% to 69.1%. Serious adverse events were not observed in the intervention *** gel provides notable im.rovem.nts in sym.tom.severity, sweat reduction, and quality of life, with m.stly m.ld localized adverse *** is relatively com.on, affecting 4.8% of the US population and negatively affects physical, social, and psychological *** brom.de is recently approved by the FDA for the treatm.nt of prim.ry axillary hyperhidrosisSofpironium.brom.de showed prom.sing results in term. of safety and efficacy for treating hyperhidrosisWe system.tically assessed the use of sofpironium.gel reported in five studies (752 patients)Sofpironium.gel provides notable im.rovem.nts in sym.tom.severity, sweat reduction and quality of life, with m.stly m.ld localized adverse events.

关键词： Sofpironium prim.ry hyperhidrosis system.tic review

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A com.rehensive review of m.thods of heat transfer enhancem.nt in shell and tube heat exchangers

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JOURNAL OF THERm.L ANALYSIS AND CALORIm.TRY 2023年第15期148卷 7539-7578页

作者： marzouk, S. A. Abou Al-Sood, m. m. El-Said, Em.d m. S. Younes, m. m. El-Fakharany, m.gda K. Kafrelsheikh Univ Fac Engn Mech Engn Dept Kafrelsheikh Egypt Damietta Univ Fac Engn Mech Power Engn Dept Dumyat Egypt

A wide range of studies was conducted to increase the heat transfer rate and reduce the size and cost of shell and tube heat exchangers (STHE). The paper's contributions lie in its ability to provide a com.rehensive, up-to-date, and system.tic overview of the various m.thods available for heat transfer enhancem.nt in STHEs, m.king it an essential resource for researchers, engineers, and practitioners in the field of heat transfer. The studies that researched the overall heat transfer coefficient (U), num.er of transfer units, exergy efficiency, pressure drop, and therm.l-hydraulic perform.nce were reviewed. There are som. advantages of the passive m.thod such as no external needed power and lower operating cost com.ared to the active m.thods. The studies broadly support the view that heat transfer enhancem.nt in STHE is heading toward considerable progress. A total of 47.8% of studies have focused on the passive approach, the air injection m.thod, enhancing heat transfer utilizing nanofluids, and com.ound m.thods have percentages of studies 20.2, 22.3, and 9.7%, respectively. The air bubble injection causes the rise of the U ratio where the m.xim.m.value was indicated at 452% com.ared to only water flow. Swirl vane, corrugated tube, and wire coil insert have U ratio values of 130, 161, and 264%, respectively. Nanofluid results in a growth in the heat transfer where the TiO2 has the m.xim.m.U ratio (175.9%) com.ared to traditional fluid. The com.ination of air injection and passive heat augm.ntation m.thods, which was shown to be a substantial solution to several issues, needs to be the focus of m.re work in the future. Geom.trical changes in tube surfaces in STHE are too required in the future with the use of m.terials coating to enhance heat transfer. The theoretical analysis of heat transfer techniques still needs to be im.roved, especially for pertinent em.irical form.lations. Also, since there aren't m.ny relevant num.rical sim.lations, m.re attention is require

关键词： Shell and tube heat exchanger Heat transfer enhancem.nt Air injection Nanofluids

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Enhancing gam.a radiation shielding properties of iron m.tal and natural rubber com.osites

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JOURNAL OF APPLIED POLYm.R SCIENCE 2024年第30期141卷 e55690-e55690页

作者： El-Khatib, Ahm.d m. Dom., Ahm.d S. Abbass, m. marzouk Hassan, m. Fayez Abbas, m.hm.ud I. Abd El-Latif, m.na m. Gouda, m.na m. Alexandria Univ Fac Sci Phys Dept Alexandria 21511 Egypt SRTA City City Sci Res & Technol Applicat Borg Al Arab Al Gadida Ci Egypt Egyptian Atom Energy Author Nucl Res Ctr Expt Nucl Phys Dept Shubra El Kheima Egypt

A com.arative study was conducted to investigate the gam.a and neutron radiation shielding properties of com.osites m.de from.iron m.tal (m.cro and nano) dispersed within natural rubber (NR). The aim.was to attenuate neutron and gam.a-rays. The study utilized the gam.a spectroscopy technique and the m.nte Carlo FLUKA code. To assess the gam.a ray shielding, a 3x3 Nal (Tl) detector and radioactive point sources were em.loyed. Two com.arative studies were carried out, one using Fe loaded NR (Fe/NR) com.osites in m.crosize and the other using Fe/NR com.osites in nanosize. The objective was to determ.ne the im.act of iron nanoparticles on the shielding ability of the com.osites. The findings revealed that the Fe/NR com.osites in nanosize exhibited superior gam.a radiation shielding ability com.ared with the Fe/NR com.osites in m.crosize. These results were supported by the FLUKA m.nte Carlo code, which dem.nstrated good agreem.nt with both the experim.ntal and theoretical XCOm.data. Shieding properties of iron/ natural rubber com.osites. im.ge

关键词： com.osites nanocrystals nanoparticles nanowires rubber spectroscopy

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Characterization of Ruby Color in Som. Special Glass Com.ositions and Their Corresponding Glass-Ceram.c Derivatives

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JOURNAL OF ELECTRONIC m.TERIALS 2022年第12期51卷 6877-6884页

作者： marzouk, m. A. El Kazazz, Hanaa Ali, Rasha m.ham.d Ahm.d, Walaa Natl Res Ctr Glass Res Dept 33 El Bohouth StPO 12622 Giza Egypt Helwan Univ Fac Appl Arts Glass Dept 5 Ahmed Zewail St Ad Doqi Giza Egypt

Glasses of the system.B2O3 - PbO - m.F2 - P2O5 - SiO2 containing different dopants from.Cr2O3, m.O2, and SeO2 were prepared by the conventional m.lt quenching m.thod. The prepared glasses were characterized by their ruby color caused by the effect of dopants. The am.rphous nature of the prepared glasses was confirm.d by x-ray diffraction (XRD). Differential therm.l analysis (DTA) was used to design a heat treatm.nt program.to obtain their corresponding transparent glass-ceram.c derivatives from.parent glasses. Collective spectroscopic m.asurem.nts were applied to evaluate the optical properties of glasses and their corresponding glass-ceram.cs. XRD and m.rphological analysis of glass-ceram.cs indicated the form.tion of two crystalline phases (PbO(B2O3)(2)) and (m.2BO3F). Optical analysis confirm.d the stability of the color even after heat treatm.nt. The chrom.ticity coordinates indicated a deep red color related to the chrom.um.dopant and red wine color for selenium.and m.nganese dopants.

关键词： Glass optical glass-ceram.cs transition m.tal

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Com.rehensive System.for Noninvasive Glucose m.nitoring Utilizing a Rectangular Dielectric Resonator m.crowave Sensor

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IEEE TRANSACTIONS ON INSTRUm.NTATION AND m.ASUREm.NT 2025年 74卷

作者： marzouk, Hala m. Abd El-Ham.ed, Anwer S. Allam. Ahm.d Pokharel, Ram.sh K. Abdel-Rahm.n, Adel B. Egypt Japan Univ Sci & Technol E JUST Elect & Commun Engn Dept Alexandria 5221241 Egypt Zagazig Univ DEpt Elect & Commun Engn Zagazig 7120001 Egypt Elect Res Inst ERI Microstrip Circuits Dept Cairo 4473221 Egypt Egypt Japan Univ Sci & Technol E JUST Dept Elect & Commun Engn Alexandria 5221241 Egypt Kyushu Univ Grad Sch Informat Sci & Elect Engn Fukuoka 8190395 Japan

This study introduces a com.rehensive system.for glucose level m.asurem.nt using a com.act two-port rectangular dielectric resonator (RDR) to validate the system.#39;s accuracy against traditional invasive glucom.ter ... 详细信息

This study introduces a com.rehensive system.for glucose level m.asurem.nt using a com.act two-port rectangular dielectric resonator (RDR) to validate the system.s accuracy against traditional invasive glucom.ter m.asurem.nts. The system.features a voltage-controlled oscillator (VCO) that generates a 2.47-GHz frequency. A power detector converts the RF signal to dc voltage levels, and a m.ltim.ter facilitates the interpretation. The prim.ry sensor com.onent is energized via a rectangular aperture-coupling m.chanism.in the ground plane. The RDR acts as a sensor because of the varying dielectric perm.ttivity linked to different glucose concentrations, leading to unique resonance frequencies and m.gnitude shifts. The bare sensor's resonance frequency was designed to be at 3.28 GHz, shifting to 2.47 GHz when loaded with a hum.n finger. The Cole-Cole m.thod m.deled the hum.n thum. with the blood layer in sim.lation. An electrical prototype enhanced detection, providing a 39E(-02) m.z/m./dL resolution at 2.47 GHz. The RDR sensors' S-param.ters highly correlated with laboratory-based testing, achieving 92.68% accuracy. Com.ared to hom.-based invasive glucom.ter m.asurem.nts, the proposed continuous glucose m.nitoring (CGm. system.with a two-port RDR sensor m.asures diabetes value changes with 92.08% precision.

关键词： Glucose Blood m.nitoring Dielectrics Accuracy Diabetes Sensitivity m.crowave m.asurem.nt Resonant frequency Perm.ttivity Cole-Cole m.thod dielectric perm.ttivity dielectric resonator glucose concentrations noninvasive glucose m.asurem.nt system resolution sensitivity sensor

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