Evaluation of the antioxidant effect of thymus vulgaris extract sunflower oil used in food thermal applications

This study was performed to investigate the retarding lipid oxidation of sunflower oil using thyme extract (TE) compared with butylated hydroxytoluene (BHT). The sunflower oil was subjected to convection heating for 1, 4, 8, 12, and 16 hours. The analyses which were made in order to watch the progress of lipid oxidation are the peroxid value (PV), p-anisidine value (p-AV) and TOTOX value. The antioxidant characteristics of thyme was measured determining the ferric reducing antioxidant power (FRAP) value and total phenolics value. The results of this study highlight that thyme extract (TE) showed a significant inhibitory effect on lipid oxidation during heat treatment. Thyme extract in doses of 200 and 600 ppm inhibited the lipid oxidation in a similar manner to buylated hydroxytoluen, and in a dose of 1000 ppm resulted a significant decrease of investigated indices such as peroxid value, p-anisidine value and TOTOX value. Thyme natural extract can be used for improving oxidative stability of sunflower oil replacing successfully butylated hydroxytoluen according to the results

Change in time of agrochemical soil parameters after tomato mineral fertilization

The paper presents the results regarding the effect of different NPK fertilization doses on change, during three years of agrochemical soil parameters after tomato mineral fertilization. The following agrochemical indicators were analyzed: pH, humus, total nitrogen, mobile phosphorus and mobile potassium content. The experience was done in a cambric cernosium soil, with low acidity reaction, very good content in nitrogen, phosphorus and potassium and the high natural fertility potential favorable vegetables cultivation in Romanian Western Plain area. The experimental field is located in temperate climatic area, characterized by Koppen classification in the formula Cfbx. The study was performed on control soil samples (without fertilizers) and soil samples after differentiated NPK fertilization in variable dozes: N30P30K30, N45P45K45, N60P60K60 and N120P60K60. Tomato fertilization with mineral fertilizer determines, in time, significant modifications of agrochemical soil parameters. To preserve the soil quality must find the optimum dose of NPK fertilizer in tomato crop fertilization

The effect of mineral fertilization on heavy metals content in tomato fruit

The goal of our study was to investigate the effect of different mineral fertilization doses on the heavy metals content (Fe, Mn, Cu, Zn, Ni, Co, Cr, Pb and Cd) in tomato fruit grown in uncontaminated area. The heavy metals bioaccumulation rates have also been investigated. The experience was done in a cambric cernosium soil, with low acidity reaction, very good content in nitrogen, phosphorus and potassium and the high natural fertility potential favorable vegetables cultivation in Romanian Western Plain area. Also, this soil is very rich in iron, zinc, cooper and cobalt but fall below acceptable parameters under the laws of our country. The study was performed on control soil samples (without fertilizers) and soil samples after differentiated NPK fertilization in variable dozes: N30P30K30, N45P45K45 , N^P«,!^, and N12oP6oK6oAlthough the soil analyses showed the presence of cobalt, chromium and lead in certain concentrations, except for cadmium which is not detectable, in tomatoes grown in the investigated area these heavy metals not found. Other micronutrients were very low values, well below the legal maximum allowed in vegetables cultivated in Romania. These results suggest that this area is favorable to ecological vegetables crops

The effect of mineral fertilization on heavy metals content in tomato fruit

The goal of our study was to investigate the effect of different mineral fertilization doses on the heavy metals content (Fe, Mn, Cu, Zn, Ni, Co, Cr, Pb and Cd) in tomato fruit grown in uncontaminated area. The heavy metals bioaccumulation rates have also been investigated. The experience was done in a cambric cernosium soil, with low acidity reaction, very good content in nitrogen, phosphorus and potassium and the high natural fertility potential favorable vegetables cultivation in Romanian Western Plain area. Also, this soil is very rich in iron, zinc, cooper and cobalt but fall below acceptable parameters under the laws of our country. The study was performed on control soil samples (without fertilizers) and soil samples after differentiated NPK fertilization in variable dozes: N30P30K30, N45P45K45 , N^P«,!^, and N12oP6oK6oAlthough the soil analyses showed the presence of cobalt, chromium and lead in certain concentrations, except for cadmium which is not detectable, in tomatoes grown in the investigated area these heavy metals not found. Other micronutrients were very low values, well below the legal maximum allowed in vegetables cultivated in Romania. These results suggest that this area is favorable to ecological vegetables crops

Bioactive compounds of pumpkin juice assortments

The purpose of this study was to obtain and characterize of some fresh pumpkin juices with addition of water, walnuts, honey, cinnamon and fresh peppermint leaves. Total soluble content, vitamin C by titration with a 2,6-dichlorophenolindophenol sodium, antioxidant capacity by FRAP assay and total phenolic content by Folin-Ciocalteu method were analyzed. Vitamin C content ranged from 0.09 to 0.15 mg/mL, with 0.13 mg/mL in individual pumpkin juice; the juice assortment without walnuts has the lower vitamin C content. Among the investigated juices, the pumpkin juice assortment with all ingredients have the higher amount total polyphenol content (4.19 mM GAE/mL) and the total antioxidant capacity (2.53 mM Fe2+/mL). We observed that the fresh pumpkin juice assortments are a real source of bioactive compounds