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Investigation of enzymatic effects on pit membranes using light and scanning electron microscopy

100%

Durmaz S. , Yildiz Ü. C. , Öztürk M. , Serdar B.

Drewno : prace naukowe, doniesienia, komunikaty

2016

tom vol. 59, nr 198

163--169

Spruce wood is one of the refractory wood species. Pit membranes, which provide liquid flow between the wood cells, have an influence on the permeability of wood. However, these membranes tend to close under the fibre saturation point (FSP), which makes the impregnation process more difficult. In this study, spruce sapwood samples were treated with two different commercial enzymes to improve their permeability. Bioprep 3000 L and Viscozyme L, which are mostly used in the textile industry, are alkaline pectinase enzymes and acidic pectinase enzymes respectively. Following enzymatic treatment, mass losses in the wood samples were observed and the wood samples were analysed with light microscopy (LM) and scanning electron microscopy (SEM). The mass losses of the wood samples were less than 2%. All enzyme treated and untreated wood samples were stained with toluidine blue. The pectin material was coloured red with toluidine blue stain. However, enzymatic treatment caused the loss of red coloration along with the expansion and rupturing of the pit membranes. These results showed that the pit membranes were destroyed.

Investigation of enzymatic effects on pit membranes using light and scanning electron microscopy

100%

Durmaz S. , Yildiz U. C. , Ozturk M. , Serdar B.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

2016

tom 59

nr 198

Kraft and modified kraft pulping of bamboo (Phyllostachys bambusoides)

100%

Deniz I. , Okan O. T. , Serdar B. , Sahin H. I.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

2017

tom 60

nr 200

Kraft and modified kraft pulping of bamboo (Phyllostachys bambusoides)

100%

Deniz I. , Okan O. T. , Serdar B. , Şahin H. I.

Drewno : prace naukowe, doniesienia, komunikaty

2017

tom vol. 60, nr 200

79--94

Delignification of bamboo (Phyllostachys bambusoides) grown in the Eastern Black Sea region of Turkey was carried out by kraft, kraft-anthraquinone (AQ) and kraft-sodium borohydride (NaBH4) pulping under a variety of conditions to determine the effect of AQ, NaBH4 and cooking parameters on pulp and paper properties such as yield, kappa number, viscosity, and strength properties. The chemical composition and fibre dimensions of the cell wall of Phyllostachys bambusoides culm fibres were also investigated. The analysed data revealed the following optimum kraft pulping conditions: Active alkali, 16% (as Na2O); NaBH4, 0.3%; AQ, 0.1%; and cooking time, 90 min. The modified kraft method with 0.1% AQ was found to provide better pulp properties than those with 0.3% NaBH4. Increasing the thickness of chip used in cooking from 2.0 mm to 4.0 mm increase the yield. The optimum cooking conditions of Phyllostachys bambusoides modified kraft pulps were found to be: screened yield, 48.1%; reject ratio, 0.53%; kappa number, 24.1; viscosity, 1210 ml/g; breaking length, 6.05 km; burst index, 5.08 kPa m2/g; tearing index, 4.99 mNm2/g; brightness 20.35%.

Effect of growıng altitude, partıcle dryıng temperature and press temperature on some technological propertıes of partıcleboard produced from black alder wood

88%

Kumas I. , Aras U. , Kalaycioglu H. , Serdar B. , Yel H.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

2021

tom 64

nr 207