Person: GÜLDAŞ, METİN
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GÜLDAŞ
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METİN
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Publication Antioxidant and anti-diabetic properties of spirulina platensis produced in Turkey(Soc Brasileira Ciencia Tecnologia Alimentos, 2021-07-01) Güldaş, Metin; Ziyanok-Demirtaş, Sedef; Şahan, Yasemin; Yıldız, Elif; Gürbüz, Ozan; GÜLDAŞ, METİN; ZİYANOK DEMİRTAŞ, SEDEF; ŞAHAN, YASEMİN; YILDIZ, ELİF; GÜRBÜZ, OZAN; Bursa Uludağ Üniversitesi/Sağlık Bilimleri Fakültesi/Beslenme ve Diyetetik Bölümü; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü; 0000-0002-5187-9380; 0000-0003-3878-3808; 0000-0003-1356-9012; 0000-0001-7871-1628; ABE-6748-2020; GLT-7125-2022; AAG-6424-2021; AAH-4272-2021; U-1332-2019Spirulina produced in Turkey has a high antioxidant capacity determined by the three common methods (ABTS, CUPRAC, and DPPH). The major phenolics found in Spirulina were acacetin (53.62%) and pinocembrin (41.28%). The bio-accessibility values of the phenolic compounds in Spirulina were approximately 60%. PUFas are the significant antioxidant compounds to prevent lipid peroxidation. Spirulina has been found to reduce blood sugar and oxidative stress due probably to the high amount of omega-6 PUFA. By the treatment of Spirulina, the levels of antioxidant enzymes (GSH-Px and SOD) were increased 240 and 60% in the healthy rats, while 19 and 59% in the diabetics. In diabetic rats fed with Spirulina, glucose, triglyceride, total cholesterol levels in blood and malondialdehyde content in body tissues were decreased by 20, 31, 22 and up to 56%, respectively. In-vitro and in-vivo tests have shown that Spirulina has anti-hyperglycaemic, anti-hyperlipidaemia and antioxidative effects on diabetic rats.Publication Effects of honey enrichment with Spirulina platensis on phenolics, bioaccessibility, antioxidant capacity and fatty acids(Elsevier, 2021-09-12) Güldaş, Metin; Gürbüz, Ozan; Çakmak, İbrahim; Yıldız, Elif; Şen, Hasan; GÜLDAŞ, METİN; GÜRBÜZ, OZAN; ÇAKMAK, İBRAHİM; YILDIZ, ELİF; Bursa Uludağ Üniversitesi/Sağlık Bilimleri Fakültesi/Beslenme ve Diyetetik Bölümü.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Zootekni Bilimleri Bölümü.; Bursa Uludağ Üniversitesi/Arıcılığı Geliştirme Uygulama ve Araştırma Merkezi.; Bursa Uludağ Üniversitesi/Keles Meslek Yüksekokulu/Gıda Teknolojisi Bölümü.; 0000-0002-5187-9380; 0000-0001-7871-1628; 0000-0003-1356-9012; GLT-7125-2022; AAG-6424-2021; U-1332-2019; KFC-1744-2024The honeybees have been fed by Spirulina platensis extract and algal honey with green color produced by the bees naturally was obtained the first time in order to enhance its medicinal properties, mainly antioxidant properties. Antioxidant capacity, bioaccessibility of phenolics, hydrolysable and extractable phenolics, sugar, phenolic and fatty acid profiles were determined in the Spirulina honey. Total phenolic content of the Spirulina honey was 14.37 mg GAE/100g and increased 28.53% with Spirulina enrichment. Antioxidant capacities of the Spirulina honey were determined as 6.31, 5.85 and 3.66 mu mol Trolox/g by ABTS, CUPRAC and DPPH methods in bioaccessible extracts. No significant difference was observed between control and Spirulina honey samples in terms of bioaccessibility of the total phenolics (p <= 0.01). Among the detected phenolic compounds (15 phenolics), acacetin (48.55%) and pinocembrine (47.13%) were the highest. Total phenolic content of the honey can be enriched up to 20% by feeding of the honey bees with 10% of Spirulina. Saccharose content in Spirulina honey was lower than the control honey as 4.42%.Publication Obesity-associated pathways of anthocyanins(Soc Brasileira Ciencia Tecnologia Alimentos, 2021-06-01) ; Yıldız, Elif; YILDIZ, ELİF; Ellergerzen, Pinar; Guldas, Metin; GÜLDAŞ, METİN; Acar, Asli Gul; ACAR, ASLI GÜL; Gurbuz, Ozan; GÜRBÜZ, OZAN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/İmmunoloji Anabilim Dalı.; 0000-0003-1356-9012; 0000-0002-5187-9380; 0000-0001-7871-1628; GLT-7125-2022; AAG-6424-2021; U-1332-2019Anthocyanins have a great potential for human health, as a sub-group of phenolic compounds. Interactions of anthocyanin involved in digestion and thus in obesity consist of inhibition of pancreatic lipase, regulation of lipolysis and lipogenesis, activation of an activated protein kinase enzyme, controlling of digestion hormones (leptin, insulin, ghrelin, cholecystokinin, GIP, GLP-1). Anthocyanins are the compounds that can control metabolic syndrome and obesity by ameliorating lipid metabolism, increasing energy expenditure, suppressing food intake and inhibiting lipid absorption. In addition, the interactions with other compounds during the processing and/or in the intestinal canal can change their absorption capability and bioavailability. Activation of mitogen-activated protein kinase and cyclooxygenase (COX) enzymes, inflammatory cytokines signaling, free-radical scavenging activity are among the primary functions of anthocyanins playing role in the basic metabolic pathways. Anthocyanins also interact with gut microbiota that plays a role in many metabolic pathways. In the review, the effects of anthocyanins on the obesity-associated mechanisms in the metabolism are considered and summarized under the light of recent researches.Publication Effects of organic acids to prolong the shelf-life and improve the microbial quality of fresh cut broccoli florets(Wageningen Academic Publishers, 2015-01-01) İrkin, Reyhan; Değirmencioğlu, Nurcan; Güldaş, Metin; GÜLDAŞ, METİN; Uludağ Üniversitesi/Karacabey Meslek Yüksekokulu; 0000-0002-5187-9380; U-1332-2019This study was conducted to evaluate the effectiveness of a combination of specific organic acids for disinfecting fresh cut broccoli floret samples contaminated with Listeria monocytogenes serotype 1/2b and Salmonella enterica serovar Typhimurium. In addition, the effects of organic acids on the microbial load of broccoli samples during storage at +4 degrees C were determined for 7 days. The organic acids tested were acetic, benzoic, sorbic, fumaric, malic, tartaric, lactic and succinic acids and the concentrations used were 1 and 2% (w/v and v/v). L. monocytogenes and S. Typhimurium were grown on the selective media before the contamination. The broccoli samples were dipped first into the pathogen solutions containing L. monocytogenes and S. Typhimurium, then into the organic acids and subsequently counted on Oxford agar and bismuth sulphite agar, respectively. The broccoli samples dipped into the organic acids without pathogen culture were also investigated in terms of total mesophilic aerobic microorganisms, psychrotrophic microorganisms, Pseudomonas spp., total lactic acid bacteria, Enterobacteriaceae spp. and total yeast-moulds for 7 days stored at 4 degrees C. S. Typhimurium and L. monocytogenes log reductions were determined at between 3 to 3.28 and 2.63 to 2.84 log colony-forming units/g with 1 and 2% of malic acid and between 3.68 to 4.17 and 2.68 to 2.9 log with 1 and 2% of tartaric acid, respectively. The malic, tartaric, lactic, succinic acids and acetic acid in the tested concentrations could be used to inhibit S. Typhimurium and L. monocytogenes and prolong the shelf-life of fresh-cut broccoli.Publication An impact assessment of origin labeling on table olive and olive oil demand(Int Soc Horticultural Science, 2008-01-01) Özkaya, MT; Lavee, S; Ferguson, L; Duman, Seyyare; Güldaş, Metin; GÜLDAŞ, METİN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi.; Bursa Uludağ Üniversitesi/Karacabey Meslek Yüksekokulu.; Ozkaya, MT; Lavee, S; Ferguson, L; 0000-0002-5187-9380; U-1332-2019In recent years, regional products and Geographical Indications (GIs) have become popular. When consumer's interest towards regional products was discovered, producers and companies tried to capitalize this interest. Origin labeled products begun to be used as a marketing strategy in food and agricultural sector. Alcoholic beverages, cheeses, meats and olive products are most popular products for origin labeling. In olive sector, Greece and Italy are dominating and they got 75% of GIs in EU. Most studies show that origin labeling affect consumer attitudes and registered products can be sold in the market with premium price. However, origin-labeling effect has been varying according to countries. Our household survey showed that consumers in Bursa are willing to buy specific regions olive oils and they prefer to buy olive cv. Gemlik that is a famous table olive of Bursa province. However, consumer awareness about origin is weak in research area and only 11% of consumers know what GIs is. According to research results, consumer awareness is a critical factor in order to make origin labeling as a viable marketing tool. However, in case consumer awareness is weak in a country, GI may serve to producers of regional products to protect their product reputation from deception. When the aim is also to effect consumer demand of a specific regional product and gain premium price via origin labeling, then consumers should be informed the first.Publication Antioxidant and bioaccessibility characteristics of functional fruit and vegetable honeys produced by innovative method(Elsevier, 2022-05-04) Demircan, H.; Tosunoğlu, H.; Çavus, Filiz; Şen, H.; Oral, Rasim Alper; Güldaş, Metin; GÜLDAŞ, METİN; Çakmak, İbrahim; ÇAKMAK, İBRAHİM; YILDIZ, ELİF; Gürbüz, Ozan; GÜRBÜZ, OZAN; Bursa Uludağ Üniversitesi/Sağlık Bilimleri Fakültesi.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; Bursa Uludağ Üniversitesi/Keleş Meslek Yüksekokulu.; 0000-0002-5187-9380; 0000-0003-3375-8777; 0000-0001-7530-7478; 0000-0003-1356-9012; 0000-0001-7871-1628; 0000-0003-1694-0104; U-1332-2019; AAK-4760-2020; GLT-7125-2022; AAG-6424-2021The functional fruit and vegetable honeys were produced by the natural bee feeding method with pomegranate, orange and black carrot concentrates. The natural enrichment method did not cause any negative effects on the quality criteria questioned in the standards such as moisture, pH, free acidity and HMF (Hydroxymethylfurfuraldehyde) content and the quality of the functional honeys obtained was high. Parallel to TPC contents, the antioxidant values of the honeys were increased 5.00-31.50, 16.09-53.96 and 21.18-39.72% by enrichment of orange, pomegranate, and black carrot concentrates. Gallic acid in pomegranate honey (14.52%) and chlorogenic acid in black carrot honey (27.01%) were determined as antioxidant components increased by enrichment. The enrichment process also led to an increase in the bioaccessibility characteristics. The increased antioxidant activity of functional honeys (DPPH) was verified by a high negative correlation value (R =-0.9103) and decreasing IC50 ratios in the opposite direction.