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 131
- Downloads 0
Processing Factors and Properties of Thermal Insulation Boards Made of Plant Fillers
Wood processing soft waste is mainly used in the production of fuel briquettes, irrecoverable (non-recyclable) waste from spinning flax and cotton are incinerated or sent to dump. The development of methods for recycling...
Features of the Horizontal Structure of Forests of Spruce Formations in the European Taiga of Russia
The article highlights the issues of studying the structure of indigenous forests of different ages as a model of sustainable forest formations. The research purpose is to study the patterns of horizontal structure forma...
The Defectiveness of Spruce Stands in the Northern Taiga Zone of the Arkhangelsk Region
The results of studying the defectiveness of spruce forests in the northern taiga zone of the Arkhangelsk Region are presented. Defectiveness has a significant impact on the sanitary condition, marketability and sustaina...
Concentration of Chemical Elements in Larix gmelinii Needles and Betula pendula Leaves
In the Trans-Baikal Territory, mining enterprises significantly pollute the environment with chemical elements. In these conditions, monitoring the state of the environment, including with the help of indicator plants, i...
Production and Use of Birch Activated Carbon for Drinking Water Post-Treatment
Pyrolysis of low-quality deciduous wood in the plants with low environmental hazard, located near the source of raw materials is one of the promising options for its processing. In the future, it will be possible to conv...