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BEKAR, ERTÜRK

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BEKAR

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ERTÜRK

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  • No Thumbnail Available
    Publication
    Investigating the effect of harvest season on the bioaccessibility of bee pollen polyphenols by ultra-high performance liquid chromatography tandem mass spectrometry
    (Springer, 2023-06-25) Bayizit, Arzu Akpınar; Bekar, Ertürk; Ünal, Taha Turgut; Çelik, M. Alpgiray; Çelik, Büşra Açoğlu; Alibaşoğlu, Elif Koç; Dilmenler, Pınar Şahin; Ömeroğlu, Perihan Yolci; Çopur, Ö. Utku; Kamiloğlu, Senem; AKPINAR BAYİZİT, ARZU; BEKAR, ERTÜRK; ÜNAL, TAHA TURGUT; Çelik, M. Alpgiray; Çelik, Büşra Açoğlu; Alibaşoğlu, Elif Koç; Dilmenler, Pınar Şahin; YOLCI ÖMEROĞLU, PERİHAN; ÇOPUR, ÖMER UTKU; KAMİLOĞLU BEŞTEPE, SENEM; Veteriner Fakültesi; Gıda Mühendisliği Bölümü; 0000-0002-6079-1970; 0000-0001-8254-3401; 0000-0003-3902-4360; 0000-0001-8783-921X; 0000-0002-7826-6322; JAN-2598-2023; ABG-4772-2020; AAG-8359-2021; IVT-9398-2023; JEP-2477-2023; EJH-9252-2022; IVK-6750-2023; AAG-8517-2021; AAG-8336-2021; P-3633-2018
    Pollen, a natural component of flowers that regulates the reproduction of plants, is in granular form and collected by bees as source of food. A wide range of nutrients including carbohydrates, amino acids, vitamins and polyphenols constitute bee pollen, the latter being responsible for its various biological activities. The aim of the current study was to investigate the effect of harvest season on the bioaccessibility of bee pollen polyphenols. For this purpose, bee pollen samples were collected for 4 consecutive weeks from Domanic, Kutahya, Turkiye. The collected samples were subjected to the standardized INFOGEST in vitro digestion model. The changes in the total phenolics, flavonoids and antioxidant capacity during digestion were measured using spectrophotometric methods, whereas the alterations in individual polyphenols were identified and quantified using ultra-high performance liquid chromatography tandem mass spectrometry (UPLC-ESI-MS/MS). Results of spectrophotometric methods showed that the bioaccessible total phenolics, flavonoids and antioxidants were higher in samples collected at the first week compared to samples collected at the following weeks (18-25%, 38-47% and 52-57%, respectively) (P < 0.05). UPLC-ESI-MS/MS analysis of bee pollen samples led to the identification of 30 major compounds including 17 flavonoids and 13 phenolic acids and other bioactive compounds. In total, the concentration of bioaccessible flavonoids was the highest in samples collected at the first week, whereas samples collected on the third week contained significantly more bioaccessible phenolic acids and other bioactive compounds (P < 0.05). Overall, the current study highlighted that harvest season affects the content and bioaccessibility of bee pollen polyphenols.
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    Publication
    A perspective on consumption of energy drinks
    (Woodhead Publ Ltd, 2019-01-01) Grumezescu, AM; Holban, AM; Bekar, Ertürk; BEKAR, ERTÜRK; İncedayı, Bige; İNCEDAYI, BİGE; Çopur, Ömer Utku; ÇOPUR, ÖMER UTKU; Karabacak, Azime Özkan; ÖZKAN KARABACAK, AZİME; Ziraat Fakültesi; Gıda Mühendisliği Bölümü; Grumezescu, AM; Holban, AM; 0000-0001-6128-7453; 0000-0003-4175-4477; AAG-8241-2021; ABG-4772-2020; AAG-8336-2021; AAG-8277-2021; AAH-2319-2019
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    Publication
    Influence of a hybrid drying combined with infrared and heat pump dryer on drying characteristics, colour, thermal imaging and bioaccessibility of phenolics and antioxidant capacity of mushroom slices
    (Pagepress Publ, 2023-01-01) Malçok, Senanur Durgut; Karabacak, Azime Özkan; Bekar, Ertürk; Tunçkal, Cüneyt; Tamer, Canan Ece; Malçok, Senanur Durgut; ÖZKAN KARABACAK, AZİME; BEKAR, ERTÜRK; TAMER, CANAN ECE; Bilim ve Teknoloji Uygulama ve Araştırma Merkezi; Gıda Mühendisliği Bölümü; 0000-0002-1314-4965; 0000-0003-4175-4477; 0000-0002-9395-3534; JOF-0451-2023; ABG-4772-2020; AAG-8503-2021; AAH-2319-2019
    An infrared-assisted heat pump drying (IR-HPD) was designed and used for drying of mushroom slices at three different infrared (IR) powers (50, 100, and 150 W) and a fixed drying temperature of 40 degrees C and air velocity of 1 m/s. The changes in total phenolic content (TPC), total antioxidant capacity (TAC) and individual phenolic contents bioaccessibility, drying characteristics, and colour values of mushroom slices were investigated. IR-HPD provided 13.11 to 30.77% higher energy savings than HPD and reduced drying time between 9.48 and 26.72%. Page, Modified Page models were considered the best for predicting the thin layer drying behaviour of mushroom slices. The effective moisture diffusivity (D-eff) value increased with IR power and ranged between 6.491x10(-10) and 9.023x10(-10) m(2)s(-1). The contents of TPC, TAC, and individual phenolics in mushroom slices were significantly reduced (p<0.05) after drying. In vitro the bioaccessibility of phenolic compounds and TAC generally decreased, whereas TPC bioaccessibility was increased. Colour values were decreased except for a* value that increased after drying. Thermal imaging results showed that IR lamps increase the temperature of the products in the middle close to the lamp by approximately 1.5 degrees C. In addition, thermal imaging gave a better understanding and visualised the effect of different power IR lamps on the temperature distribution of the products according to their distance from the lamp. As a result, drying mushrooms with a hybrid drying system combined with IR and heat pump dryer provided higher energy savings than HPD, reduced drying time, and maintained the physical and nutritional characteristics of mushrooms. Overall, the use of IR-HPD is an alternative tool that allows us to obtain high-quality dried mushrooms with good nutritional attributes and a high amount of bioaccessible polyphenols.