Spinach (Spinacia oleracca) is a leaf vegetable with low calorie. It appears to be the source of bioflavonoids, vitamins, minerals and antioxidants, which are highly resistant to heat treatment. Among these substances there are beta-carotene, zeaxanthin, lutein, which appear to be active antioxidants. Spinach also contains В vitamins, vitamin E, vitamin K, calcium and iron. It is common in many countries but is not widely used in Russia. The beneficial features of spinach allow to use it as the ingredient for developing of new types of flour and bakery products for functional and specialized purposes. Due to specific organoleptic and technological properties, it is recommended to use refined spinach in combination with other plant ingredients. The high content of fat-soluble substances in spinach causes using in formulations and technologies of flour and bakery products fat components for purposes of digestion of these substances. These components can be the mixture of vegetable oils of different consistency. For improving of spinach technological properties, it is recommended to use drying with following grinding of dried product into powder. There are several drying and grinding methods, which differ in number of stages and.technological operations, machine and hardware design and energy intensity, which defines the choice of optimal method of spinach powder obtaining. The use of spinach powder in formulations and technologies of flour and bakery products allows obtaining products with high organoleptical qualities, and the containment of the aforenamed substances in products allows to consider them as functional.
The paper presents the results of research of leafy plant raw materials drying with pulsed infrared (IR) radiation by the example of spinach (Spinacia oleracea L.). The efficiency of the selected method for weight and humidity changes in the processed material has been analyzed. The specific energy consumption for removal of 1 g of moisture as well as ascorbic acid concentration in dried product have been calculated. The results of the analysis show that IR-drying of leafy plant raw materials is efficient and can be carried out in production environment.
This study demonstrated the feasibility of comprehensive enzymatic conversion of starch for non-waste applications in food industry. Enzymatic conversion of starch gives rise to nano-sized particles that can be used for manufacturing biodegradable and edible packaging materials and glucose syrup for replacing sugar in confectionery formulations. The 96 h enzymatic hydrolysis yielded starch nanoparticles smaller than 100 nm. Films based on nano-sized starch particles have promising physicochemical properties for manufacturing biodegradable and edible packaging materials. Such properties as reduced moisture content, increased homogeneity, crystallinity, and high initial thermal stability improve the mechanical and performance characteristics of the final food packaging materials. During film formation from starch subjected to preliminary mechanical amorphization, the polymer chain is recrystallized. The C-type crystal structure of starch is converted to the B-type structure. The supernatant obtained by starch hydrolysis can be used for producing glucose syrup. The resulting glucose syrup can be used as a sugar substitute in production of confectionery products. No objective technological differences in properties of glucose syrup obtained by comprehensive conversion of starch and the commercially available glucose syrup derived from sucrose were revealed.
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