جستجوی مقالات مرتبط با کلیدواژه "starch" در نشریات گروه "پزشکی"

Bleeding agents play a vital role in preventing complications from uncontrolled bleeding, such as death and organ damage. In addition to maximum coagulation speed and minimal blood loss, these compounds should have features such as biocompatibility, degradability, hemocompatibility, suitable mechanical properties, reasonable price, and ease of use. Recent research shows that some natural polymers such as oxidized cellulose, chitosan, starch, collagen and alginate have blood clotting properties. This study has investigated the binding performance, polymer source of these materials and products available in the market.

In this research, the role of bleeding coagulation by natural polymers was investigated in 55 authentic English and Farsi articles. International and Persian publications such as Elsevier, Springer, Wiley Online Library, ScienceDirect and SID were used. Keywords and functional words such as blood clots, sodium alginate, chitosan, hemostatic, oxidized cellulose, collagen and starch were used for searching.

The first step in wound healing is ligation. Subsequent steps that contribute to tissue regeneration include inflammation, proliferation, and remodeling. These materials are divided into synthetic and natural in the world market and research works. Natural coagulant polymers include oxidized cellulose, chitosan, collagen, starch, and alginate. Next, description of natural polymers, brief introduction of synthetic polymers, physical structure of binders and commercial samples have been discussed.

The use of natural polymers as hemostatic agents shows the high potential of these substances in improving therapeutic processes and reducing the side effects caused by synthetic substances, which can lead to the development of new and effective strategies in the management of acute bleeding.

 The emergence of nanotechnology and the use of nanoscale materials has made it possible to take advantage of the potential and novel applications of this technology in various fields of agriculture. Therefore, this research aims to make fertilizer for high-consumption nutrients such as nitrogen, phosphorus, and potassium (NPK) by hydrogels based on the sepiolite (Sep) clay nanostructure and starch (S).

 In this study, the physical inhibition method was used to control the release of high-consumption nutrient elements of fertilizer. For this purpose, appropriate amounts of NPK salt were inserted in the structure of Sep-S hydrogels. Then, the release level of nutrients was investigated by the column elution and measuring the conductivity of the outlet solution of the column.

 The elution profile of the NPK fertilizer shows that the salts quickly leave the end of the column so that the conductivity of the solution at the end of the column in the first washing after consumption of 250 mL of water reaches about 12000 µS/cm. On the other hand, the elution profile of the slow-release fertilizer containing NPK salts shows that the release profile of the fertilizer in 4 times of washing with the same volume is almost similar (range 1400 µS/cm to 2300 µS/cm). Results show that the placement of fertilizer salt inside the proposed hydrogels leads to the slow release of highly consumed nutrients.

 The release of nutrients from the structure of slow-release fertilizer based on Sep-S hydrogels has a delay, which is vital to prevent the excessive release of nutrients, and minimize negative environmental effects and excessive consumption of chemical fertilizers. Also, the materials used to make the slow-release fertilizer have a relatively low cost.

Today, sweeteners are one of the most important additives in the food industry and the demand for using these materials to produce different types of food products is increasing. Fructose or Laevulose is one of the natural sweeteners, which is found in abundance mainly in various fruits and honey. Corn starch is one of the most important sources of fructose syrup and has the potential to be used as a sugar substitute in the production of various industrial foods such as beverages, industrial breads, confectionery, chocolate and candy, dairy products, meat products, and many other products can be used as natural sweeteners, thickeners, fillers, etc. The favorable effects of fructose sugar on various foods include antimicrobial properties and increasing the shelf life of the product, creating the suitable flavor and aroma, keeping chocolate and similar products soft, and creating the suitable color and delaying staleness in a variety of bakery products. Despite the favorable effects of fructose syrup on the quality of some foods and its cheaper price than sugar, we must also keep in mind that there are still ambiguities and concerns about the harmful effects of excessive consumption on consumer health.

Contamination of the environment by heavy metals, pollute water and agricultural products. The aggregation of these metals will cause various diseases for human. Therefore, it is important to study how to make them safe. The purpose of this study is to evaluate the efficiency of starch-iron oxide nanocomposite in removing two heavy metals, nickel and cadmium, from wastewater.

In this study, an attempt was made to use starch as natural polymer to prepare starch-iron oxide nanocomposites. Its structural properties and functional groups were investigated using scanning electron microscopy (FE-SEM), elemental decomposition (EDX) and Fourier transform infrared (FT-IR) spectroscopy. Then, the efficiency of starch-iron oxide nanocomposite as an adsorbent for the removal of heavy metals including nickel and cadmium from continuous synthetic solutions was investigated. For this purpose, aqueous solution with a concentration of 1000 mg/l of nickel and cadmium metals was prepared. The effect of adsorbent amount, pH and contact time on the removal process was studied. Langmuir, Freundlich and Temkin isotherm models were used for study of procedure isotherm.

The synthesized nanocomposite has good efficiency in removing nickel and cadmium. Maximum uptake of heavy metal ions was occurred at pH=4, using 0.05g of starch-iron oxide nano-composite from 20 ml aqueous solutions content 10 ppm of two studied ions. The adsorption efficiencies were found to be pH dependent which because of ionic interaction, by increasing pH value the removal increased. The cadmium adsorption process follows the Freundlich equation, while the nickel metal does not follow any of the equations. Investigations of kinetics of the process were performed and showed pseudo second-order model has the best correlation for adsorption procedure.

In general, this investigation showed that, the fabricated adsorbent has high efficiency for removal of nickel and cadmium ions. But application of this method in the industry should be economically evaluated.

Cold plasma is an eco-friendly and non-thermal technique, which has become an important technology to change the physical and chemical features of polymers. Recently, cold plasma has been considered in the decontamination and modification of packaging materials in the food industry. Therefore, the objective of this study was to survey the effect of using low-pressure oxygen plasma treatment on the surface and physicochemical properties of starch-chitosan composite films.

The low-pressure oxygen plasma treatment of starch-chitosan composite films was carried out using a plasma cleaner system at various times (4, 8 and 12 min). Afterwards, the surface properties and physicochemical properties of untreated and plasma-treated films were compared.

The surface roughness and hydrophilicity of the films were increased after tlasma treatment. The tensile strength of the plasma-treated films was improved. Plasma treatments decreased the oxygen permeability of the films but no significant change in their water vapor permeability was observed.

In this study, although plasma treatment increased the tensile strength and decreased oxygen permeability of the films, their surface hydrophilicity was increased too. There is a need for further studies to modify the starch-chitosan composite film by plasma treatment.

Reduction or elimination of sugar from dairy dessert formulations is in relation to the safety of people and has important nutritional quality. But sugar elimination from food formulations results to the some problems that should be solved with application of sutiable texture improver(s).

The effects of different levels of corn starch (3, 4.5, and 6%), gelatin (0.2, 0.4, and 0.6%) and substituting date syrup (17,19.5, and 22%) instead of sugar on the physical and chemical properties, as well as textral and sensory attributes of dairy dessert were investigated. RSM was selected and the Central Composite Design with 5% probabality was chosen.

The effect of gelatin and date syrup on the Brix of dairy dessert was significant. The viscosity of the samples increased significantly (P<0.05) with the increase of starch and gelatin. Effect of starch was more than gelatin, but date syrup had no significant effect on viscosity. In case of texture (hardness and adhesion), all dessert samples had smiliar trend to viscosity results. All samples had little or no serum separation. Starch, gelatin and date syrup had no significant effects on L* factor, but their effect on a* and b* parameters was significant (P<0.05). The sensory evaluation results demonstrated no significant difference between all samples and the scores determined in the range of 3.13-4.30. All samples were negative for yeast, mold and E.coli. The total count was 10-30 cfu/g, therefore, it is acceptable.

RSM is a sutiable and reliable method for optimizing dairy dessert and predicted the best condition, including: 3% starch, 0.2% gelatin and 27.9% date syrup. In these conditions, pH, TSS, overall acceptability, hardness and adhesiveness were 6, 29.8, 3.7, 63.7 and 57.6 g.sec values, respectively