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    The Comparison of the Chemical Composition, Sensory, Phenolic and Antioxidant Properties of Juices from Different Wheatgrass and Turfgrass Species
    (Univ Agr Sci & Veterinary Med Cluj-Napoca, 2016) Ozkose, Abdullah; Arslan, Derya; Acar, Aysenur
    Wheatgrass juice is mainly derived from the common wheat Triticum aestivum L. The present study focused on the analysis of the potential of different perennial turfgrass species in grass juice production by determining certain compositional characteristics. The effects of fertilisers on the plants and the cutting time on some chemical constituents and antioxidant potential of grass juices were addressed. The juices from the different species of grasses, such as T. durum, T. aestivum, Lolium perenne L., Festuca arundinacea Schreb. were obtained by pressing. DPPH (1, 1dipheny1-2-picrylhydrazyl) radical scavenging activity, elemental composition, total chlorophylls, total carotenes, tocopherols, vitamin C, total phenols, viscosity and the colour profiles of the grass juice samples were analysed. Water-soluble dry matter, protein, total phenols, flavonoids and vitamin E (especially Durum cultivar) content were found to be higher in the juices of Triticum species as compared to the other grasses. Turfgrass species demonstrated higher concentrations of oil (in grass), vitamin C (unfertilised samples), chlorophyll (except L. perenne local) and major elements. The pressing of turfgrass was an easy process. Such perennial grass varieties have advantages over the Triticum species in terms of having higher concentrations of vitamin C (unfertilised samples) and major elements. The results of sensory analysis suggested that L. perenne (cultivar) is the most promising cultivar in terms of obtaining pressed grass juice.
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    The Comparison of the Chemical Composition, Sensory, Phenolic and Antioxidant Properties of Juices from Different Wheatgrass and Turfgrass Species
    (Univ Agr Sci & Veterinary Med Cluj-Napoca, 2016) Ozkose, Abdullah; Arslan, Derya; Acar, Aysenur
    Wheatgrass juice is mainly derived from the common wheat Triticum aestivum L. The present study focused on the analysis of the potential of different perennial turfgrass species in grass juice production by determining certain compositional characteristics. The effects of fertilisers on the plants and the cutting time on some chemical constituents and antioxidant potential of grass juices were addressed. The juices from the different species of grasses, such as T. durum, T. aestivum, Lolium perenne L., Festuca arundinacea Schreb. were obtained by pressing. DPPH (1, 1dipheny1-2-picrylhydrazyl) radical scavenging activity, elemental composition, total chlorophylls, total carotenes, tocopherols, vitamin C, total phenols, viscosity and the colour profiles of the grass juice samples were analysed. Water-soluble dry matter, protein, total phenols, flavonoids and vitamin E (especially Durum cultivar) content were found to be higher in the juices of Triticum species as compared to the other grasses. Turfgrass species demonstrated higher concentrations of oil (in grass), vitamin C (unfertilised samples), chlorophyll (except L. perenne local) and major elements. The pressing of turfgrass was an easy process. Such perennial grass varieties have advantages over the Triticum species in terms of having higher concentrations of vitamin C (unfertilised samples) and major elements. The results of sensory analysis suggested that L. perenne (cultivar) is the most promising cultivar in terms of obtaining pressed grass juice.
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    Development of infusion tea formulations with food wastes: Evaluation of temperature and time effects on quality parameters
    (Elsevier, 2022) Acar, Aysenur; Aydin, Merve; Arslan, Derya
    The study aimed to investigate the suitability of some food wastes for use in the production of herbal tea and to reveal their properties in terms of bioactive component content, some physical properties and sensory quality. Three new blends consisting of banana, pomegranate, mandarin, eggplant and red onion peels, walnut shell, cherry stalk and corn tassel were infused at different temperatures (70 and 100 degrees C) and time (3, 4 and 5 min). Corn tassel tea, which has a high phenolic component content (677.7 mg GAE/L), received less sensory acceptance due to its bitter aftertaste. Therefore, walnut shell tea containing moderate phenolic content was the most preferred tea blend. Significant effects of different infusion temperatures and times on the color indices of teas were also demonstrated. The sensory properties of samples infused for 3 min were more acceptable. The highest correlation coefficients were calculated between total phenolic compounds and subjective odor parameters. Utilization of mandarin, pomegranate, banana, eggplant and red onion peels, walnut shell, corn tassel and cherry stalk in formulating a functional and an alternative food product can be attractive to consumers and industrial producers due to their affordability and high bioactivity.
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    Ultrasound Technology Parameters: Effects on Phenolics in Olive Paste and Oil in Relation to Enzymatic Activity
    (Wiley, 2019) Yahyaoui, Amira; Rigane, Ghayth; Mnif, Sami; Ben Salem, Ridha; Acar, Aysenur; Arslan, Derya
    In this paper, the occurrence of secoiridoid aglycones via degradation of phenolic glucosides which have strong effects on commercial, nutritional, and sensory properties of olive oil is studied. The experiment consists in the sonication treatment of Chemlali and Memecik cvs. olive paste three times for 4, 8, and 10min. This kind of approach has never been used in determining the partition and degradation of phenolics during extraction. Concerning phenolic content present in Chemlali olive oil extracted from whole olives, no significant differences are found after 10min of treatment using ultrasound apparatus, whereas a rise of more than 60% is detected if olive paste without stones is used. On the other hand, the total phenolic content of Memecik cv. increases positively with the increasing time of treatment. Throughout this report, it is noted that enzymatic activities are affected by ultrasound treatment.Practical Applications: The results of this study will be useful in modification of present processes or development of new processes with the aim of protecting and improving the phenolic composition of olive oil. To the best of the authors' knowledge, this kind of systematic approach has never been used in determining the partition and degradation of phenolics during extraction. It is believed that describing the effects of high-power ultrasound applications on olive paste before malaxation will exhibit possible benefits for the future of olive processing technology. The optimization of olive oil extraction parameters with proper adjustments in such a way that the quality of the product is highly increased is an important issue. The effect of ultrasound technology parameters is investigated from the point of phenolic compounds by searching their relation to enzymes in Chemlali and Memecik cvs. olive paste. In addition, the effects of stone removal during extraction are also studied in terms of enzymes in Chemlali and Memecik cvs. olive paste and phenols in olive oil.