Determination of antifungal and antibacterial activities of natural dye of pomegranate skin (Punica granatum L.) implemented on wooden materials

The demand for partially harmless dyes produced from natural sources as an alternative to synthetic dyes has been increasing. Natural dyes environment and they are attractive materials contributing to the protection of natural balance and to the reduction of aesthetic concerns of people. Yet, for natural dyes to be long-lasting and cling to the surface, they need to be used with mordant substances. In the present study, the purpose is to determine the antifungal and antibacterial activities of natural dye obtained from pomegranate skin by means of ultrasonic. Plant extract obtained through ultrasonic method was applied to oriental beech (Fagus orientalis L.) and yellow pine (Pinus sylvestris L.) wooden materials by means of dipping and ultrasonic-assisted immersion. For the analysis of the results, data obtained from the natural dye were compared with those obtained from the synthetic dye. The findings of the analysis revealed that the most effective results in terms of antifungal activities were obtained from the solutions applied to yellow pine wood. For beech samples, the natural dye yielded better results when compared to the synthetic dye. Moreover, pomegranate skin solutions were found to prevent the spread of antibacterial activities. As a result, it was concluded that pomegranate skin extract can be used as wood preservative and coloring materials by mixing with holding provider.

Fire resistance performance of wood materials colored with eco-friendly pomegranate skin (Punica granatum) extracts

The main goal of this study was to determine fire resistance properties of wood treated with pomegranate extract and mordant mixes. According to that wood materials Scotch pine (Pinus sylvestris L.), Oriental beech (Fagus orientalis Lipsky) were chosen. Aluminum sulphate (KAl2(SO4)3.18H2O) copper sulphate (CuSO2.5H2O) and vinegar were used as mordant agent and a synthetic dye was used for comparison. Ultrasonic assisted method were used for extractionthe plant dyestuff from pomegranate skin (Punica granatum) and then applied to wood blocks by immersion (classic) and immersion ultrasonic assisted methods. The combustion test was realized according to ASTM-E 69-02 (2002) standard. The mass losses release of gasses (CO, O2) and the temperature differences of samples were detected for each 30 seconds during combustion. The results showed that the aluminum sulphate mixes were showed the best results on all tests. Unfortunately test performances are not enough to retard the fire effect on the wood materials. Eco-friendly natural colorant might be developed to use them as fire retardant.

Determination of leaching features of wood surfaces colored by eco-friendly red beetroot (Beta vulgaris) extract

The aim of this study to develop an eco-friendly wood stain and to determine the adsorption and desorption on surfaces. In this context; plant dyestuff was extracted from the red beetroot by using ultrasonic assisted method and applied to wood blocks of Turkish oriental beech, Scots pine, oak, and walnut with immersion (classic) and ultrasonic-assisted immersion methods. As mordants, ferrous sulphate, aluminum sulphate, copper sulphate, and vinegar were chosen. In the study, the effect of such parameters as the medium pH (3, 7 and 9), temperature (22°C and 40°C), velocity of agitation (10 and 30 rpm) in leaching was investigated. As a result of experiments; red beetroot extracts performed good desorption, vinegar and copper sulphate were reduced the best desorption on surfaces. Ultrasonic-assisted method was not affect the leaching performance positively, but general leaching results showed that red beetroot can be used for wood surface stain and they can be alternative to chemical dyes.