جستجوی مقالات مرتبط با کلیدواژه « متانول » در نشریات گروه « صنایع غذایی »

The propose of this study is evaluation effects of different solvents on antioxidant activity and phenol and flavonoid content of Postia puberula (Asteracea). The obtained ethanol, methanol, water and hydroalchol extract were investigated for antioxidant activity and phenol and flavonoid content. The antioxidant activity were measured by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and β-carotene/linoleic acid assay, also phenol and flavonoid content were measured by gallic acid and quercetin as standard compound. The result of this study showed that the the different solvents can effective on antioxidant activity, phenol and flavonoid content so that, in both method hydroalchol extract has more antioxidant activity, also hydroalchol extract has more phenol, but more flavonoid  observed in ethanolic extract

​Distillates are one of the most popular consumer products of medicinal plants. High essential oil and low methanol contents have always been considered as two desirable factors by experts in the food and pharmaceutical industries. In order to investigate the effect of harvest height on Hyssop (Hyssopus officinalis L.) distillate quality, an experiment was conducted in a randomized complete block design with three replications. Four harvesting heights of 15, 25, 35 and 45 cm (measured from the highest point of the plant), as well as the remaining stalk, were the treatments in this research. The measured traits were: methanol and essential oil content in the distillates. The results of statistical analysis showed a significant effect of treatments on the studied traits. It can be said that methanol values significantly increased with the harvesting height measured from the top. It varied from 71.64 ± 2.7 mg/l for the height of 15 cm to 219.77 ± 3.52 mg/l for 45 cm. In the remaining stalk, methanol values increased from 142.33 ± 1.34 mg/l for 15 cm height to 393.86±24.65 mg/l for 35 cm height. It should be mentioned that at 45 cm height of cut, there was no remaining stalk. The amount of essential oil in the distillate increased with harvesting height. The findings of this study showed that the harvesting height of 15 cm from the highest part of the plant is recommended for obtaining a higher distillate quality with lower methanol content, and the possibility of increasing the number of harvesting cuts for the production of medicinal and nutritional products.

Studies on different parts of the walnut is indicate the exist of antioxidant, antimicrobial and anticancer properties. In this work, the effect of variety levels of temperature, time and solvent concentration investigated on antioxidant property of Methanol extract of interstitial tissue in walnut kernel during ultrasound process by response surface methodology statistical design. The results showed that increasing of temperature and time improved the antioxidant property, but in highest level of temperature, time and solvent antioxidant property decreased due to phenolic component oxidation and polymerization or dilution of extract. The best of condition for achieve to extract with high antioxidant based on Total phenol, DPPH and FRAP methods were 28.71 min, 39.22 oC and 416.57 ml per 25 gr interstitial tissue powder. Under these parameter yield of extraction, total phenol component, DPPH and FRAP calculated 3.706%, 22.67 (Gallic acid), 0.0108 (IC50) and 1270.05 (mMol Fe) .respectively.