Objective: The purpose of this study was therefore to investigate various physicochemical properties, phenolic composition and antioxidant capacities of the oak honey, large quantities of which are produced in the Thrace region of Northwest Turkey. Methods: Hunter color values (Lab), optical rotation, electrical conductivity, moisture and ash were measured as physicochemical determinants. Sugar, proline content, mineral, phenolic acids, total phenolic flavonoids contents were evaluated as chemical parameters. Ferric reducing antioxidant power (FRAP) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging were used as antioxidant determinants. Results: The results determined that dark-colored honeys (mean 24.95±8.35 L) have proline levels (649.82±203.90 mg/kg), total phenolic content (TPC) (67.29±13.10 mgGAE/100 g) and total flavonoid content (TFC) (10.14±4.78 mgQE/100 g), a high ratio of fructose/glucose (1.65±0.18). Rutin (11.14±8.50 μg/g), p -coumaric acid (6.97±5.80 μg/g) and protocatechuic acid (6.12±4.39 μg/g) were the major phenolic components, and quercetin was also detected in varying amounts in all samples. Potassium (2523±0.28 mg/kg), calcium (63.40±3.20 mg/kg) and magnesium (38.88±0.65 mg/kg) were the major minerals in the honeys. Conclusion: Our results showed that physicochemical properties, phenolic compounds, antioxidant capacity, sugar and mineral contents successfully distinguish the geographical origins of oak honey. These findings will contribute to a more accurate evaluation of oak honey in the literature.

In this study, essential oil and oil acid content, antioxidant and antifungal properties of oils obtained from pomegranate (Punica granatum L.) and parsley seeds (Petroselinium crispum) produced on an industrial scale were investigated. Pomegranate seed oil was obtained cold pressed in an industrial scale, while parsley seed oil was obtained industrial steam distillation. As a result of pomegranate seed oil GC-MS analysis, fifteen components were determined. Parsley seed oil was twelve compounds was identified. Punicic acid (61.19 %) was found as the dominant compound in pomegranate seed oil while apiole (14.21 %) was determined as the dominant compound in parsley seed oil. When the antioxidant capacity of the oils were examined, it was determined that the oils obtained from pomegranate seeds have a moderate antioxidant activity, the oils obtained from parsley seeds have high antioxidant activity. Antifungal activity of pomegranate (Punica granatum L.) and parsley (Petroselinium crispum) seed oil against five different plant pathogens, F. oxysporum f. sp. Lycopersici, B. cinerea, S. sclerotiorum, A. solani, and R. solani were also determined.

In this study, the physicochemical properties, antioxidant capacity, sensory properties, and phenolic and mineral profiles of instant rosehip teas prepared using spray-drying (SD) and freeze-drying (FD) were compared. The yield of instant tea produced using FD and SD was 23.75 and 21.25 g/100 g,...

Bleaching of Bamboo (Phyllostachys bambusoides) Kraft-AQ Pulp with Sodium Perborate Tetrahydrate (SPBTH) after Oxygen Delignification

Bryophytes are the oldest terrestrial plants in the world, about 3000 taxon are known to have medicinal properties. Plagiochila asplenioides (L.) Dumort, which is one kind of bryophytes, was examined in this study. The antimicrobial, antioxidant, fatty acids, mineral analysis and some chemical properties of the extracts obtained from the bryophyte were investigated. It was determined that the P. asplenioides extract had a moderate effect in terms of antioxidant properties and total phenolic content. In terms of fatty acid compositions, oleic and palmitic acid were found to be high. As a result of the mineral analysis, it has been observed that it can accumulate high levels of potassium (K), calcium (Ca), iron (Fe) and aluminum (Al). In addition, it was observed that the extracts obtained from P. asplenioides showed only a moderate inhibitory effect against Escherichia coli and Salmonella typhimurium.