جستجوی مقالات مرتبط با کلیدواژه "optimization" در نشریات گروه "باغبانی"

The purpose of this research is to extract kappa carrageenan from Kappaphycus alvarezii algae and to investigate the factors influencing the different characteristics of carrageenan. In this research, the extraction of kappa-carrageenan was done by different methods, including extraction with potassium chloride and calcium hydroxide, extraction with isopropyl alcohol and extraction by spray drying method.Quantitative and qualitative characteristics of kappa carrageenan including color, pH, moisture content, total ash, acid insoluble ash, sulfate content, water absorption capacity, minimum gelation concentration, gel strength, syneresis, viscosity, efficiency, total microorganism count, morphology and infrared Fourier transform spectroscopy were investigated. Based on infrared Fourier transform spectroscopy, the highest degree of similarity between the types of kappa carrageenan samples extracted in this research with the commercial sample was observed in the extraction method with 6% potassium hydroxide, and the extraction efficiency in this method is 34.84%. It was found that it is desirable.Also, the microorganism count test with the result of 1500 Cfu/g indicated the high level of cleanliness of the gel and the possibility of using it in food products. Extraction with 6% potassium hydroxide, in addition to high extraction efficiency, has a very high structural similarity with the commercial sample. On the other hand, all the evaluated quantitative and qualitative characteristics of the extracted kappa-carrageenan were in full compliance with the relevant standards, and therefore, the use of this method in extraction is suggested.

In recent years, research on medicinal plants as therapeutic supplements has increased dramatically. Lavender (Lavandula stricta Del.) extract due to its special therapeutic properties is widely used in natural products. Due to the importance of physical quality of powder extract produced from medicinal plants in the food and pharmaceutical industry, in this research the performance of spray dryer in powder production of lavender extract at three levels of input temperatures including 150, 180, and 210 °C, three levels of input air flow rate including 6, 8, and 10 L min-1 and the ratios of 0, 25, and 50% maltodextrin drying aid to the dry matter mass of the extract were studied using the response surface method and physical properties of the produced powder were investigated. The moisture content, aqueous activity, bulk density, particle density, and porosity of powder samples varied in the range of 5.10-8.70%, 0.26-0.30%, 0.45-0.60 g mL-1, 0.99-2.50 g mL-1, and 47-87%, respectively. The maximum dryer yield in the production of lavender powder was determined to be 89% at a temperature of 210 °C and an air flow rate 8 L min-1 and a mass ratio 50% of dryer aid. Taking into account all the physical factors evaluated, the optimum point in processing lavender extract was obtained at input air temperature of 177.29 °C and input air flow rate of 10 L min-1, and ratio of maltodextrin to dry matter mass of extract of 67, in which moisture content, aqueous activity, bulk density, particle density, and powder porosity were 6.6%, 0.28, 0.58 g mL-1, 1.46 g mL-1, and 60.95%, respectively.