در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Antioxidant,Curcumin,Bis(tetrabenzylglucose)curcumin,Bis(tetraacetylglucose)curcumin,Vanadium
- چکیده:
- چکیده انگلیسی: The reaction of bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (curcumin) and two novel ligands of bis[4-tetrabenzylglucose-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (bis(tetrabenzylglucose)curcumin) (BTBGC) and bis[4-tetraacetylglucose-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (bis(tetraacetylglucose)curcumin) (BTAGC) with vanadium in methanol, in a 2:1 molar ratio, which yield the complexes of ML2 where M is [VO]2+, have been synthesized and characterized by FT-IR, mass spectrometry, 1H NMR spectroscopy and elemental analysis. These novel compounds were also examined for their antioxidant activity (using Trolox Equivalent Antioxidant Capacity (TEAC) antioxidant assay as a measure of their overall ability to scavenge free radicals compared to antioxidant standards such as Trolox); compounds with free hydroxyl groups were more active than those one whose locking such and also the metal complexes showed more activity than Trolox. The antioxidant capacity was decreased in BTBGC, BTAGC and their complexes compared to curcumin and its oxovanadium (IV) complex, corroborating the importance of curcumin’s free phenolic OH groups for scavenging oxidants potential. And also, the presence of the methoxy group increases the activity.
- انتشار مقاله: 26-07-1393
- نویسندگان: Khosro Mohammadi,Mansooreh Zahedi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Veterinary Medicine
- نوع مقاله: Journal Article
- کلمات کلیدی: heavy metals,Atomic Absorption Spectrophotometry,canned tuna
- چکیده: برخی فلزات سنگین برای سلامتی انسان خطرناکاند و نگرانی فزایندهای از وجود این فلزات در مواد غذایی در مناطقی از دنیا وجود دارد. ماهی، بهویژه ماهی تن، مقادیر زیادی از چندین فلز سنگین را از آب جذب بدن خود میکند و نقش مهمی در تغذیه» انسان دارد. هدف: در این مطالعه مقادیر جیوه و چهار عنصر کمیاب دیگر در پنج نمونه برند تجاری عرضه شده در بازار تبریز بعد از هضم به روش AOAC تعیین شد. روش کار: در کل 40 نمونه جمعآوری شد. مقادیرسرب و کادمیوم به روش اسپکتروفتومتری جذب اتمی با لوله» گرافیتی، مقادیر نیکل و قلع به روش اسپکتروفتومتری جذب اتمی با سیستم شعلهای و مقدار جیوه به روش اسپکتروفتومتری با سیستم تولید هیدرید تعیین شد. نتایج: مقادیر عناصر اندازهگیری شده به میلیگرم در کیلوگرم وزن مرطوب عبارت بود از سرب (242/0-01/0)، کادمیوم (05/1-0/0)، نیکل (589/0-113/0)، قلع (9/0-05/0) و جیوه (205/0-1/0.) نتیجهگیرینهایی: نتایج نشان دادند که کنسرو ماهی تن عرضه شده در بازار تبریز حاوی مقادیر بیخطر از فلزات سنگین برای سلامتی انسان و پایینتر از متوسط مقادیر توصیه شده» EC/FAO/WHO است.
- چکیده انگلیسی: Some heavy metals are dangerous to health and there is rising concern about the quality of foodstuffs in some parts of the world. Fish, particularly Tuna fish, can concentrate huge quantities of several metals from water and they even play a significant role in human nourishment. OBJECTIVES: In this study, the concentrations of mercury and four trace metals in five brands of canned tuna samples purchased within the Tabriz city (Iran) were determined after digestion via the Association of Official Analytical Chemists techniques. METHODS: A total of 40 samples were collected. Lead and cadmium levels were determined via graphite tube atomic absorption spectrophoto-metry, whereas nickel and tin levels were determined via flame atomic absorption spectrophotometry, and mercury levels were determined via hydride generation atomic absorption spectro-photometry. RESULTS: The ranges obtained for the elements were Pb (0.01-0.242), Ca (0.0-1.05), Ni (0.113-0.589), Sn (0.05-0.9), and Hg (0.1-0.205) mg/kg wet weight. CONCLUSIONS: The results showed that tuna fabricated and marketed in Tabriz (Iran) had safe level of heavy metals that were lower than the averages of EC/FAO/WHO levels for these toxic metals.
- انتشار مقاله: 23-10-1392
- نویسندگان: Hadi Pourjafar,Reza Ghasemnejad,Negin Noori,Khosrow Mohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Antioxidant,Curcumin,Bis(tetrabenzylglucose)curcumin,Bis(tetraacetylglucose)curcumin,Vanadium
- چکیده:
- چکیده انگلیسی: The reaction of bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (curcumin) and two novel ligands of bis[4-tetrabenzylglucose-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (bis(tetrabenzylglucose)curcumin) (BTBGC) and bis[4-tetraacetylglucose-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (bis(tetraacetylglucose)curcumin) (BTAGC) with vanadium in methanol, in a 2:1 molar ratio, which yield the complexes of ML2 where M is [VO]2+, have been synthesized and characterized by FT-IR, mass spectrometry, 1H NMR spectroscopy and elemental analysis. These novel compounds were also examined for their antioxidant activity (using Trolox Equivalent Antioxidant Capacity (TEAC) antioxidant assay as a measure of their overall ability to scavenge free radicals compared to antioxidant standards such as Trolox); compounds with free hydroxyl groups were more active than those one whose locking such and also the metal complexes showed more activity than Trolox. The antioxidant capacity was decreased in BTBGC, BTAGC and their complexes compared to curcumin and its oxovanadium (IV) complex, corroborating the importance of curcumin’s free phenolic OH groups for scavenging oxidants potential. And also, the presence of the methoxy group increases the activity.
- انتشار مقاله: 26-07-1393
- نویسندگان: Khosro Mohammadi,Mansooreh Zahedi
- مشاهده