Influence of Cardboard Pretreatment on the Determination of Starch Content by the Enzymatic Method
Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2021, Vol 12, Issue 5
Abstract
We determined the amount of starch by the enzymatic method in different samples of corrugated cardboard, including the sample produced of primary semi-finished products and corrugated cardboard made of 100 % waste paper. For starch enzymatic degradation, it is necessary to extract it from the corrugated board structure, since the processes of compression and keratinization of pulp fibers reduce the availability of starch for extraction. Enzymatic treatment requires the use of a complex amylolytic preparation for complete hydrolysis of starch to glucose. We were able to determine, respectively, 70 and 84 % of starch obtained from primary semi-finished products by mechanical methods, such as defibrillation in water and degradation in a liquid nitrogen medium, and added at the production stage of corrugated cardboard. It was shown that extraction with alkaline agents was necessary for more complete extraction of starch from corrugated cardboard. The influence of alkaline treatment on the characteristics of fibers of waste paper fractions obtained at the Sukhonsky Cardboard and Paper Mill has been analyzed. The fibers swell in alkali, resulting in an increase in fiber width and its shortening, as well as a decrease in crystallinity, which can be a positive opportunity for more complete starch extraction. Fiber swelling and crystallinity reduction are more intensive for the short fiber fraction compared to the long fiber fraction. When determining starch in corrugated cardboard using the standard method SCAN-P 91:09 SСAN-W 13:09 it was not possible to detect all the starch added at the production stage of corrugated cardboard from primary semi-finished products. Also the processing conditions of this methodology lead to degradation of the partially hydrolyzed starch. The most complete extraction of starch from corrugated cardboard was achieved by two stages of alkaline extraction under the following conditions: 5 % NaOH, temperature of 20 °C, the duration of each extraction – 2 h. Under these processing conditions it was possible to determine all the starch (22.8 kg/t) in the corrugated cardboard produced of primary semi-finished products with known consumption of starch; the starch content in the corrugated cardboard produced of 100 % waste paper was 48.2 kg/t.
Authors and Affiliations
Igor A. Khadyko, Senior Lecturer; ResearcherID: N-1537-2017, ORCID: https://orcid. org/0000-0001-7128-1688 Evgeny V. Novozhilov, Doctor of Engineering, Prof. ; ResearcherID: O-9738-2015, ORCID: https://orcid. org/0000-0003-3642-3307 Dmitry G. Chukhchin, Candidate of Engineering, Prof. ; ResearcherID: O-9487-2015, ORCID: https://orcid. org/0000-0003-3250-8469
Keywords
Related Articles
- EP ID EP697378
- DOI 10.37482/0536-1036-2021-5-150-162
- Views 141
- Downloads 0
Assessment of Natural and Forest Reclaimed Forage Lands in Semi-Desert Conditions in Southern Russia
Haphazard use of pastures has become one of the factors of disturbance of their natural vegetation. Therefore, forest reclamation works were carried out and significant areas of strip plantations of shrubs were created i...
Problems of Forest Resource Management in the Arctic Zone of the Russian Federation
The study exposes the issues with managing land and forest resources in the Arctic region. Among them are the inability to estimate the cost of forest resources, the conversion of forestry lands into industrial lands, th...
Experimental Evaluation of Strength of End Joints with Rectangular Pressed Fingers
End jointing of wooden blanks is widely distributed in the manufacture of wood products. The most commonly used splicing technology on finger joints with pointy fingers has a number of drawbacks, including the presence o...
Biometric Parameters of Planting Material as a Test Indicator of Success of Pinus silvestris L. Plantations
The creation and cultivation of artificial plantations of conifers largely depends on the planting material quality. The paper is devoted to the study of the relationship between the main parameters of planting material...
Seed Germination of Coniferous Introduced Species in the Environment of Central Kazakhstan with Various Stratification and Inclusion of Needle Litter into Substrate
This study observes the issues of the possible usage of wastes from timber industry in the sprouting of seeds of coniferous plants in the arid climate of Central Kazakhstan. Such treatment of coniferous seeds is easily i...