Observaţii asupra conţinutului în azotiţi la unele fructe şi legume la păstrarea în diferite condiţii

Due to the low caloric intake, correlated with the high content of vitamins, fiber and mineral salts, plant foods are essential for a healthy diet. On the other hand, plant products can also be an important source of potentially harmful compounds, such as nitrogen, residues from fertilizer treatments and soil conditioners.The problem has become particularly relevant since frequent acute and chronic intoxications have been reported in young children who have consumed these substances in water or food, becoming even more complex after highlighting the cumulative effect of nitrates and the possibility of carcinogenic nitrosamines.This study was performed using 5 samples of fruits: red apple, golden apple, grapefruit, pears, lemons and 5 samples of vegetables: green peppers, cucumbers, squash, onions, cabbage. The nitrate content was analyzed and compared during storagefor 7 days at different temperatures

Potential valorisation of Protobind 1000 as adsorbent for Pb2+ AND Zn2+

The adsorption of metal ions from increasing concentrations in aqueous solutions by modified straw lignin Protobind 1000 was studied. The effect of metallic ion concentrations (from 20.72 to 207.2 mg·L-1 for Pb2+ and from 6.538 to 65.38 mg·L-1 for Zn2+) and contact time (30, 60 and 90 minutes) were studied at pH = 6 and 200C. Langmuir and Freundlich isotherm equations were applied to assess equilibrium data and the kinetics of the adsorption processes were analysed using Lagergren pseudo first order and Ho&McKay pseudo second order models. The results show that the adsorption processes reached equilibrium after 90 minutes, but similar values were registered after 60 minutes. The Freundlich isotherm described the process better, denoting chemisorption with the formation of ion-lignin complex structures. The Ho&McKay model fit the adsorption data better with regression coefficients equal to 1 compared to the Lagergren model, where the regression factors varied between 0.72 and 0.95. For the maximum concentration of lead solution and the longest adsorption time of 90 minutes, the Ho&McKay model predicted an equilibrium capacity qe of 13.1406 mg·g-1 compared to the 13.1398 mg·g-1 obtained. For zinc adsorption, the same maximum concentration and time were considered, and the pseudo-second order model predicted a qe of 12.6743 mg·g-1 compared to the obtained value of 12.6714 mg·g-1. The uptake of lead was greater on 0.15 g of adsorbent (a maximum of 27.23 mg·g-1) than the zinc uptake (a maximum of 8.28 mg·g-1), for all analysed concentrations

POTENTIAL VALORISATION OF PROTOBIND 1000 AS ADSORBENT FOR Pb 2+ AND Zn 2+

The adsorption of metal ions from increasing concentrations in aqueous solutions by modified straw lignin Protobind 1000 was studied. The effect of metallic ion concentrations (from 20.72 to 207.2 mg·L-1 for Pb2+ and from 6.538 to 65.38 mg·L-1 for Zn2+) and contact time (30, 60 and 90 minutes) were studied at pH = 6 and 200C. Langmuir and Freundlich isotherm equations were applied to assess equilibrium data and the kinetics of the adsorption processes were analysed using Lagergren pseudo first order and Ho&McKay pseudo second order models. The results show that the adsorption processes reached equilibrium after 90 minutes, but similar values were registered after 60 minutes. The Freundlich isotherm described the process better, denoting chemisorption with the formation of ion-lignin complex structures. The Ho&McKay model fit the adsorption data better with regression coefficients equal to 1 compared to the Lagergren model, where the regression factors varied between 0.72 and 0.95. For the maximum concentration of lead solution and the longest adsorption time of 90 minutes, the Ho&McKay model predicted an equilibrium capacity qe of 13.1406 mg·g-1 compared to the 13.1398 mg·g-1 obtained. For zinc adsorption, the same maximum concentration and time were considered, and the pseudo-second order model predicted a qe of 12.6743 mg·g-1 compared to the obtained value of 12.6714 mg·g-1. The uptake of lead was greater on 0.15 g of adsorbent (a maximum of 27.23 mg·g-1) than the zinc uptake (a maximum of 8.28 mg·g-1), for all analysed concentrations

Studiu asupra compoziţiei chimice a unor produse de tip baby-food şi sucuri destinate copiilor

Blended foodor baby-food products marketed for children contain a source of protein, often meat, or can be made entirely from cereals, fruit blends and vegetables. These products must be appropriatefrom the point of view of both nutritional and safety. Fruit or vegetable juices are recommended as a good source of vitamins and as an additional source of water for healthy infants and young children. With all their benefits, the addition of sugar from the marketed products should be carefully controlled so as not to lead to obesity or metabolic disorder. This paper includes the determination of the content of ions present in three commercially available juices and three types of baby-food from fruits, vegetables and meat

Observaţii asupra conţinutului în azotiţi la unele fructe şi legume la păstrarea în diferite condiţii

Due to the low caloric intake, correlated with the high content of vitamins, fiber and mineral salts, plant foods are essential for a healthy diet. On the other hand, plant products can also be an important source of potentially harmful compounds, such as nitrogen, residues from fertilizer treatments and soil conditioners.The problem has become particularly relevant since frequent acute and chronic intoxications have been reported in young children who have consumed these substances in water or food, becoming even more complex after highlighting the cumulative effect of nitrates and the possibility of carcinogenic nitrosamines.This study was performed using 5 samples of fruits: red apple, golden apple, grapefruit, pears, lemons and 5 samples of vegetables: green peppers, cucumbers, squash, onions, cabbage. The nitrate content was analyzed and compared during storagefor 7 days at different temperatures

Analiza unor parametri chimici pentru trei tipuri de lapte praf reconstituit

The infant formula means a breast milk substitute specifically made to meet the nutritional requirements of infants during the first few months of life until appropriate complementary feed is introduced. Milk intake in the baby's diet is recommended for at least the first two years of life, maternal -at least six months, the animal or the formula of reconstituted milk powder -further, due to the essential nutritional principles in growth and physical and cognitive development.The chemical parameters analyzed in the present paper follow the quality of three milkpowders (infant formula, next step formulaand lactose-free formula) and three types of water (marketed, tapped and filtered) used for reconstitution with regard to acidity and content in nitrite, chloride, sulphite and phosphateions