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Characterization of antioxidant and antibacterial compounds from aerial parts of Haplophyllum tuberculatum

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Journal of Bioresources and Bioproducts 2022年第1期7卷 52-62页

作者： Salma Salim Al-Saeghi mohammad amzad hossain Salem Said Jaroof Al-Touby School of Pharmacy College of Pharmacy and NursingUniversity of NizwaP.O.Box 33Postal Code 616NizwaOman School of Nursing College of Pharmacy and NursingUniversity of NizwaP.O.Box 33Postal Code 616NizwaOman

The aerial parts of Haplophyllum tuberculatum(***)have traditionally been used by local communities to treat fever,gastrointestinal disorders,worms,malaria and fractures,how-ever,the responsible ingredients of the selected medicinal plant have not been *** the present study,antibacterial and antioxidant ingredients were isolated and characterized from the plant parts of locally grown ***,and their biological activity was *** powder aerial parts were extracted with methanol and the extract was successively frac-tionated with different polarities of *** polarities of extracts(hexane,chloroform,ethyl acetate,butanol,methanol and water)were used to determine their antibacterial and antioxi-dant activity by established in-vitro *** disk diffusion and free radical scavenging 2,2-diphenyl-1-picrylhydrazyl(DPPH)methods were used to evaluate antibacterial and antioxidant activities of the prepared extracts and pure isolated compounds at different concentrations against three strains of Gram-positive and three Gram-negative *** antibacterial activity results showed that all prepared fractions and isolated pure compounds of the plant species gave signif-icant activity against all Gram(+and-)bacterial strains with the range of inhibition 0-20 *** antioxidant activity of the prepared extracts at all concentrations also showed substantial *** on the highest activity,ethyl acetate and chloroform extracts were selected for the separation and isolation of antioxidant and antibacterial compounds by thin layer chromatogra-phy(TLC),column chromatography(CC),and preparative thin layer chromatography(PTLIC).The structure of the isolated antioxidant and antibacterial compounds from the ethyl acetate and chloroform extracts were determined on the basis of nuclear magnetic resonance(NMR)and mass *** isolated pure compounds and active extracts could be used as a medicine for various infectious related di

关键词： H.tuberculatum Soxhlet extraction Antioxidant activity Antibacterial activity Chromatography Pure compound

The ASEAN experience of the purchasing power parity theory

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Financial Innovation 2018年第1期4卷 333-343页

作者： S.M.Woahid Murad mohammad amzad hossain Department of Economics Noakhali Science and Technology UniversityNoakhali 3814Bangladesh Department of Economics Jahangirnagar UniversitySavarDhaka 1342Bangladesh

We used panel data analysis to evaluate the relative purchasing power parity(PPP)hypothesis of the ten ASEAN member countries between 1973 and *** incorporated the cross-sectionally augmented panel unit root test as proposed by Pesaran(J Appl Econ 22:265-312,2007).For panel cointegration analysis,we employed the four error-correction-based Westerlund(Oxf Bull Econ Stat 69:709-748,2007)panel cointegration *** Westerlund(Oxf Bull Econ Stat 69:709-748,2007)tests are general enough to permit a large degree of heterogeneity,both in the long-run cointegrating relationship and in the short-run dynamics,and dependence within as well as across the cross-sectional *** check the robustness of the results,we further estimated the cointegration test excluding Indonesia and *** findings support our initial ***,all the results overwhelmingly support the relative PPP ***,the monetary authority would be able to implement a self-regulating monetary *** would also be able to control the exchange rates.

关键词： Purchasing power parity Panel unit root test Panel cointegration test ASEAN countries

Gas chromatography-mass spectrometry analysis of different organic crude extracts from the local medicinal plant of Thymus vulgaris L

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Asian Pacific Journal of Tropical Biomedicine 2013年第1期3卷 69-73页

作者： Laila Salim Al Hashmi mohammad amzad hossain Afaf Mohammed Weli Qasim Al-Riyami Jamal Nasser Al-Sabahi School of Pharmacy College of Pharmacy and NursingUniversity of NizwaP.0.Box 33Postal Code 616NizwaSultanate of Oman Central Instrument Laboratory College of Agriculture and Marine SciencesSultan Qaboos UniversitySultanate of Oman

Objective:To isolate and analyze the chemical composition in different crude extracts of from the leaves of locally grown of Thymus vulgaris L(***)by gas chromatography-mass spectrometry(GC-MS).Methods:The shade dried leaves powder was extracted with methanol by using Soxhlet *** crude extracts of *** and the derived fractions of hexane,chloroform,ethyl acetate and butanol were ***:Qualitative analyses of various organic crude extracts of *** by using GC-MS showed that there were different types of high and low molecular weight *** of the isolated and identified compounds by GC-MS in the crude extracts are basically biologically ***,the *** leaf possessed certain characteristics that can be ascribed to cultivation on a domestic *** crude extracts were prepared from the powder leaves of *** for respective compounds can be chosen on the basis of above GC-MS ***:All the major compounds were identified and characterized by spectroscopic method in different organic crude extracts of *** are biologically active *** the identification of a good number of compounds in various crude extracts of *** might have some ecological role.

关键词： Thymus vulgaris L Preparation crude extracts Soxhlet extractor GC-MS analyses

Phytochemical studies of various polarities leave crude extracts of Omani Datura metel *** evaluation of their antimicrobial potential

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Journal of Coastal Life Medicine 2015年第3期3卷 214-219页

作者： Ali Saleh Hamed Al-Jafari mohammad amzad hossain School of Pharmacy College of Pharmacy and NursingUniversity of NizwaP.O.Box 33Postal Code 616NizwaSultanate of Oman

Objective:To identify the chemical constituents and evaluate antimicrobial potential of various crude extracts from leaves of Datura metel grown in ***:The leaf samples were collected from the University of Nizwa and extracted with methanol by using Soxhlet *** isolated crude extract was defatted with distilled water and extracted with solvents of different polarities including hexane,chloroform,ethyl acetate and *** compositions of the crude extracts were analyzed by gas chromatography-mass spectrometer and their antimicrobial potential was evaluated by agar disc diffusion method against one Gram positive bacteria Staphylococcus aureus and two Gram negative bacteria Escherichia coli and Pseudomonus ***:The crude extracts were composed of different organic compounds such as alkaloids,hydrocarbons,aromatic hydrocarbons,organic acids,terpenoids,vitamin *** methanol and its fractionated crude extracts showed antimicrobial potential with inhibition zone in the range of 0-13 ***:The selective crude extract from the leaves of Datura metel could be used as natural antibiotics.

关键词： Datura metel Soxhlet extractor Crude extracts Gas chromatography-mass spectrometry analysis Antimicrobial activity

Evaluation of total phenols,total flavonoids and antioxidant activity of the leaves crude extracts of locally grown pigeon pea traditionally used in Sultanate of Oman for the treatment of jaundice and diabetes

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Journal of Coastal Life Medicine 2015年第4期 317-321页

作者： Asma Hamood Al-Saeedi mohammad amzad hossain School of Pharmacy College of Pharmacy and NursingUniversity of NizwaP.O.Box 33Postal Code 616NizwaSultanate of Oman

Objective:To determine the total phenols,total flavonoids and evaluate the antioxidant activity of crude extracts from the leaves of pigeon pea native to Sultanate of Oman by a popular ***:The powdered leaves samples from pigeon pea were used for extraction by maceration method with methanol *** methanol free crude extract by maceration method was suspended in water and successively extracted with different polarities of *** obtained crude extracts with different polarities were used for the determination of total phenols and flavonoids contents by using Folin-Ciocalteu reagent and aluminum chloride *** antioxidant activity of six crude extracts from pigeon pea was determined byα,αα-diphenyl-β-picrylhydrazyl ***:The different polarities leaves crude extracts showed a significant amount of total phenols content ranging from 97.80 to 256.00 mg of GAE/g of crude *** same leaves crude extracts also showed good amount of total flavonoids content ranging from 1.38 to 8.51 mg QE/g plant *** six crude extracts from the leaves displayed significantα,αα-diphenyl-β-picrylhydrazyl free radical scavenging activity with highest value in chloroform extract followed by methanol,butanol,ethyl acetate,hexane and water crude extracts(98.13%,89.26%,88.82%,86.41%,79.95%and 69.44%,respectively).Conclusions:Leaves crude extracts from pigeon pea have high contents of total phenols and *** this regards,it could be used as a medicine for the treatment of different diseases.

关键词： Pigeon pea Total phenols content Total flavonoids content Antioxidant activity Maceration method UV-visible spectroscopy

Study of total phenol,flavonoids contents and phytochemical screening of various leaves crude extracts of locally grown Thymus vulgaris

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Asian Pacific Journal of Tropical Biomedicine 2013年第9期3卷 705-710页

作者： mohammad amzad hossain Khulood Ahmed Salim AL-Raqmi Zawan Hamood AL-Mijizy Afaf Mohammed Weli Qasim Al-Riyami School of Pharmacy College of Pharmacy and NursingUniversity of Nizwa

Objective:To prepare various crude extracts using different polarities of solvent and to quantitatively evaluate their total phenol,flavonoids contents and phytochemical screening of Thymus vulgaris collected from Al Jabal Al Akhdar,*** of ***:The leave sample was extracted with methanol and *** it was defatted with water and extracted with different polarities organic solvents with increasing *** prepare hexane,chloroform,ethyl acetate,hutanol and methanol crude extracts were used for their evaluation of total phenol,flavonoids contents and phytochemical screening *** established conventional metliods were used for quantitative determination of total phenol,flavonoids contents and phytochemical ***:Phytochemical screening for various crude extracts were tested and shown positive result for flavonoids,saponins and steroids *** result for total phenol content was the highest in hutanol and the lowest in methanol crude extract whereas the total flavonoids contents was the highest in methanol and the lowest hexane crude ***:The crude extracts from locally grown Thymus vulgaris showed high concentration of flavonoids and it could be used as antibiotics for different curable and uncurable diseases.

关键词： Thymus vulgaris L., Various crude extracts Phytochemical screening Soxhlet extractor Total phenol Flavonoids contents.

Chemical composition of essential oils and in vitro antioxidant activity of fresh and dry leaves crude extracts of medicinal plant of Lactuca Sativa *** to sultanate of Oman

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Asian Pacific Journal of Tropical Biomedicine 2013年第5期3卷 353-357页

作者： Rahma Said Salim Al Nomaani mohammad amzad hossain Afaf Mohammed Weli Qasim Al-Riyami Jamal Nasser Al-Sabahi School of Pharmacy College of Pharmacy and NursingUniversity of Nizwa Central Instrument Laboratory College of Agriculture and Marine SciencesSultan Qaboos University

Objective:To isolate and analyse the chemical composition in the essential oils and free radical scavenging activity of different crude extracts from the fresh and dry leaves of vegetable plants of Lactuca sativa L.(***).Methods:The essential oils and volatile chemical constituents were isolated from the fresh and dry leaves of ***(lettuce)grown in Sultanate of Oman by hydro distillation *** antioxidant activity of the crude extracts was carried out by well established free radical scavenging activity(DPPH)***:About 20 chemical compounds of different concentration representing 83.07%and 79.88%respectively were isolated and identified by gas chromatography-mass spectroscopy in the essential oils isolated from the fresh and dry leaves asα-pinene(5.11%and 4.05%).γ-cymene(2.07%and 1.92%),thymol(11.55%and 10.73%),durenol(52.00%and 49.79%),α-terpinene(1.66%and 1.34%),thymol acetate(0.99%and 0.67%),caryophyllene(2.11%and 1.98%),spathulenol(3.09%and 2.98%).camphene(4.11%and3.65%),limonene(1.28%and 1.11%)representing these major chemical ***,some other minor chemical constituents were also isolated and identified from the essential oil of lettuce including p-pinene,α-terpinolene,linalool,4-terpineol,α-terpineol,o-methylthymol,L-alloaromadendrene and ***:The chemical consliluents in the essential oils from the locally grown lettuce were identified in the following classes or groups of chemical compounds such as monoterpenes,sesquiterpenes volatile organic compounds and their oxygenated ***,the essential oils and the crude extracts from Omani vegetable species of lettuce are active candidates which would be used as antioxidant,antifungal or antimicrobial agents in new drugs preparation for therapy of infectious diseases.

关键词： Lactuca saliva Omani lettuce Clevenger apparatus Essential oil Durenol Thymol Soxhlet extractor Organic crude extracts Antioxidant activity GC-MS analyses

Copper and Mercury in Food, Biological and Pharmaceutical Samples: Spectrophotometric Estimation as Cu(DDTC)<sub>2</sub>

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American Journal of Analytical Chemistry 2014年第13期5卷 838-850页

作者： mohammad Nasir Uddin Nur Mostaq Shah mohammad amzad hossain Md. Muzahidul Islam Department of Chemistry University of Chittagong Chittagong Bangladesh

An alternative spectrophotometric method was optimized and validated for the estimation of mercury using diethyldithiocarbamate (DDTC), a common reagent, widely used for the preconcentration and isolation of metal ions in complex matrices followed by their estimation by varied techniques. Diethyldithiocarbamate forms yellow Cu(DDTC)2 with copper and white Hg(DDTC)2 with mercury (having d10 system) which are extracted in CCl4. The UV-visible spectrum of Cu(DDTC)2 is very stable at pH 5.0 and has a maximum absorption (λmax) at 435 nm. Hg(DDTC)2 is more stable than Cu(DDTC)2. Estimation of mercury is based on a quantitative displacement of Cu(II) of Cu(DDTC)2 with the addition of mercury followed by the measurement of reduced absorbance. Primarily, method was optimized and validated for the estimation of copper. Therefore, simultaneous determination of Cu(II) and Hg(II) in mixture is proposed fractionating the extract. The molar specific coefficient (ε) for the mercury was 1.4 × 104 mol﹣1·L·cm﹣1 and for copper was 3.16 × 105 mol﹣1·L·cm﹣1 at 435 nm. The detection limits of Cu2+ and Hg2+ were 0.023 μg·mL﹣1 and 0.029 μg·mL﹣1, respectively. The calibration curve shows good linearity of 0.02 - 12.0 and 0.02 - 15.0 μg·mL﹣1 for the Cu2+ and Hg2+ determination, respectively. Proposed technique was applied to food, biological and pharmaceutical samples for the determination of Cu(II) and Hg(II).

关键词： Copper Mercury Diethyldithiocarbamate Spectrophotometric Method Food Biological Pharmaceutical Samples

Antimicrobial and cytotoxic potential of seeds and flowers crude extracts of sunflower

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Grain & Oil Science and Technology 2019年第4期2卷 103-108页

作者： Nuzha Bint Mahdi Bin Ali Al-Shukaili mohammad amzad hossain College of Pharmacy and Nursing University of Nizwa

Oil-producing crops,including Helianthus annuus L.(***,Sunflower),have been used for the treatment of different human diseases since ancient *** study aims to determine the antimicrobial and cytotoxic potential of different polarities of seeds and flower extracts of locally grown *** by well-established *** achieve the objects,the plant extracts were prepared from both flowers and seeds powder samples individually with methanol solvent by using a Soxhlet extraction *** antimicrobial and cytotoxic potential of the flowers and seed extracts were determined by the in vitro diffusion and brine shrimp method(BSL).The results of the antimicrobial potential of both prepared flower and seed extracts of various polarities at different concentrations showed promising potential against the gram-positive and gram-negative bacterial strains,within the range of inhibition zone 0–20 *** the flower extracts,the highest potential was obtained in water extract and the lowest potential was in butanol extract followed by water>ethyl acetate>hexane>methanol>chloroform>butanol ***,from the seed extracts,the highest potential was obtained in water extract and the lowest potential was in the methanol extract followed by water>hexane>butanol>ethyl acetate>chloroform>methanol *** the other hand,the results of cytotoxicity among the flowers extracts against the brine shrimp method where the highest LC50 against brine shrimp nauplii were found to be 31.25μg/mL in water extract and the lowest LC50 was 1345.86μg/mL in chloroform extract followed by water>ethyl acetate>hexane>butanol>methanol>chloroform ***,different polarities of seed extracts,the highest LC50 against brine shrimp nauplii was shown to be 109.56μg/mL in butanol extract and the lowest LC50 was 1513.56μg/mL in ethyl acetate extract followed by butanol>hexane>water>methanol>chloroform>ethyl acetate *** conclusion,the results showed that both flowers and s

关键词： Helianthus annuus Sunflower Antimicrobial potential Cytotoxic potential Agar gel diffusion method BSL method