Nazan Tokatlı Demirok

ORCID: 0000-0003-1936-9337
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Research Areas
  • Phytochemicals and Antioxidant Activities
  • Microbial Inactivation Methods
  • Fermentation and Sensory Analysis
  • Probiotics and Fermented Foods
  • Essential Oils and Antimicrobial Activity
  • Protein Hydrolysis and Bioactive Peptides
  • Food Quality and Safety Studies
  • Meat and Animal Product Quality
  • Nuts composition and effects
  • Antioxidant Activity and Oxidative Stress
  • Bee Products Chemical Analysis
  • Botanical Research and Applications
  • Infant Nutrition and Health
  • Celiac Disease Research and Management
  • Enterobacteriaceae and Cronobacter Research
  • Helicobacter pylori-related gastroenterology studies
  • Spectroscopy and Chemometric Analyses
  • Food Drying and Modeling
  • Food Science and Nutritional Studies
  • Pomegranate: compositions and health benefits
  • Heavy Metals in Plants
  • Listeria monocytogenes in Food Safety
  • Infant Health and Development
  • Microbial Metabolites in Food Biotechnology
  • Irrigation Practices and Water Management

Namık Kemal University
2017-2024

Thermosonication (TS), also known as ultrasonic-assisted heat treatment, is gaining attention in liquid product processing due to its ability improve quality parameters and can serve an alternative thermal treatments. The parsley juice (TS-PJ) was subjected thermosonication treatment (frequency: 26 kHz; power: 200 W; amplitude 60, 70, 80, 90, 100%; temperature: 40, 45, 50, 55, 60 °C; time: 4, 6, 8, 10, 12 min) compared with untreated control (C-PJ) pasteurized treated (P-PJ) (85 °C/2...

10.1021/acsomega.4c02749 article EN cc-by ACS Omega 2024-06-26

The inhibition of Escherichia coli ATCC 25922 (E. coli), Staphylococcus aureus ATCC6538 (S. aureus), Salmonella Enteritidis 13076 Enteritidis), and Listeria monocytogenes DSM12464 (L. monocytogenes) is one the main aims food industry. This study was first in which use ultrasound microwave power were applied to optimize values bioactive components, amino acids, mineral compositions tangerine juice inhibit coli, aureus, Enteritidis, monocytogenes. response surface methodology (RSM) used...

10.3390/pr10102100 article EN Processes 2022-10-17

Gilaburu (Viburnum opulus L.) is an important fruit that has been studied in recent years due to its phytochemicals and health benefits. In this study, traditionally produced vinegar made from gilaburu (C-GV) was evaluated. Vinegar with higher levels of bioactive components optimized by response surface methodology (RSM) also using ultrasound (UT-GV). The maximum optimization result for the achieved at 14 min 61.2 amplitude. effectiveness thermal pasteurization (P-GV) on An increase detected...

10.3390/biology11060926 article EN cc-by Biology 2022-06-17

Onion (Allium cepa L.) juice is an important product used in gastronomy and food formulations. The first objective of this study was to optimize the content bioactive compounds purple onion (POJ) after thermosonication process using response surface methodology (RSM) artificial neural network (ANN) application models. Second, anticancer, antibacterial, antihypertensive, antidiabetic effects POJ obtained thermal pasteurization (P-POJ) or (TS-POJ) were investigated obtaining ANN RSM analysis...

10.3390/pr12030517 article EN Processes 2024-03-03

Grape juice is a widely consumed fruit due to its bioactive compounds, minerals, and aroma components. Our objective was investigate ultrasound treatment of black grape affects components using response surface methodology (RSM) artificial neural network (ANN) optimization. At the same time, mineral components, sugar organic acids, volatile profiles were compared in treated with thermal pasteurization. ANN showed superior predictive values (>99%) RSM. Optimal combinations obtained at 40 °C,...

10.1016/j.heliyon.2023.e19314 article EN cc-by-nc-nd Heliyon 2023-08-20

Watermelon vinegar is a traditional fermented product with antioxidant activity. This study aimed to investigate the antihypertensive and antidiabetic properties of watermelon treated through ultrasound using RSM method. We also evaluated activity (CUPRAC DPPH), bioactive content (total phenolics total flavonoids), mineral composition, phenolic compounds, α-glucosidase inhibition %, ACE optimized, α-amylase % during 24 months storage optimized vinegar. Optimized was achieved at 6.7 min 69%...

10.3390/fermentation10030133 article EN cc-by Fermentation 2024-02-28

Bee bread (perga) is a natural bee product formed by the fermentation of pollen collected bees via lactic acid bacteria and yeasts. This study aims to determine bioactive compounds, amino acid, sugar, organic profile samples from Ardahan province Türkiye. The highest total phenolic, flavonoid, DPPH values in were determined as 18.35 mg GAE/g, 2.82 QE/g, 3.90 TEAC/g, respectively. Among phenolic gallic had value at 39.97 µ/g. While all essential acids except tryptophan detected samples,...

10.3390/foods13050795 article EN cc-by Foods 2024-03-04

Poppy is an important edible plant containing bioactive components. This study aimed to produce good-tasting poppy sherbet by determining the content using a response surface methodology (RSM). At same time, components, phenolic compounds, and color properties were investigated in optimum during storage; 0.26 g of dried corn flowers, 0.15 citric acid, 4.29 sucrose values most promising, achieving high scores for color, smell, taste, general acceptance from sensory (sensory score 8.55 color;...

10.3390/foods12163114 article EN cc-by Foods 2023-08-18

This research aimed to investigate the effects of ultrasound treatment on quality characteristics optimized functional bee bread-enriched poppy sherbet. Antioxidant activity capacity, antimicrobial activity, phenolic compounds, ascorbic acid, organic acid and sugar composition, sensory properties were performed under storage conditions. The present was first express effect bioactive components in a sherbet enriched with bread, using response surface methodology (RSM) optimization. maximum...

10.1021/acsomega.4c03351 article EN cc-by ACS Omega 2024-06-18

Poppy vinegar with functional properties is a fermented product. This study evaluated traditionally produced poppy vinegar. The was conducted on to determine the maximum increase in angiotensin converting enzyme (ACE) inhibitory activity %, total phenolic content (TPC), and radical scavenging (DPPH) of at different combinations ultrasound treatment duration (2-14 min) amplitude (40-100%). optimal parameters obtained using response surface methodologies (RSM) were 5.5 min 57%. When DPPH...

10.1021/acsomega.4c04342 article EN cc-by ACS Omega 2024-07-29

This research was aimed with the objective of investigation effects sonication treatment on quality characteristics mallow vinegar such as organic acids, sugar, amino minerals, bioactive compounds, and microstructure. For enhancement components in (Malva saylvestris L.), response surface methodology (RSM) employed using central composite design to determine combined maximization contents vinegar. The maximum optimization results for were obtained at 8 minutes 50.9 amplitude. As a result...

10.1590/fst.67122 article EN Food Science and Technology 2022-01-01

Balanced colonization of the gastrointestinal tract in newborn is very important for acquisition an immune system infancy. Lactobacillus spp. useful human nutrition because its potential probiotic and functional features. In this research, 27 strains were identified representing 104 species isolated from baby feces. The properties isolates investigated. study, sample consisted 14 children aged 3-47 weeks who breastfed. Strains determined phenotypically by testing arginine hydrolysis, salt...

10.1590/fst.24821 article EN Food Science and Technology 2021-06-23

Hardaliye is a lactic acid fermented beverage produced from red grape or juice with addition of crushed mustard seeds and benzoic can be found in the Thrace region Turkey. The aims this study were to determine dominant species bacteria hardaliye investigate their technological probiotic properties potential use as starter culture production Hardaliye. For aim isolated total 28 samples (23 collected different regions Kirklareli Turkey 5 traditional methods laboratory conditions) identified....

10.15832/ankutbd.385870 article EN Tarım Bilimleri Dergisi 2017-09-16

Grapes are among the most commonly produced fruits worldwide, thanks to their ease of cultivation in terms climate and soil requirements. Owing abundant vitamins, bioactive compounds minerals incorporating them into one’s diet is advised for promoting human health. The components ultrasound-treated white grape juice were optimised by response surface methodology (RSM). In addition, untreated (C-WGJ), ultrasound treated (U-WGJ) thermally pasteurized (P-WGJ) samples compared total phenolics...

10.31015/jaefs.2024.1.20 article EN International Journal of Agriculture Environment and Food Sciences 2024-03-24

Lactic acid bacteria which are important for production of fermented milk products contain may strains called Lactobacillus, Streptococcus, Lactococcus and Leuconostoccus. As a result, lactic ‘milk-souring (fermenting)’ organisms. In addition to the fermentation abilities Lactobacillus spp., it is aroma, texture formation comprises most group bacteria. Their critical importance comes from their metabolic capacity probiotic features. this research, yogurt, cheese kefir samples were collected...

10.31015/jaefs.2023.2.10 article EN International Journal of Agriculture Environment and Food Sciences 2023-06-12

Background/Aim: At present, a gluten-free diet is the only efficient way to treat celiac disease (CD). The development of novel approaches lessen or counteract pathogenic effects gluten remains crucial for treatment CD. aim in this investigation was examine restorative Acetobacter ghanensis as probiotic against gliadin-induced modulation barrier integrity an intestinal epithelial cell (IEC) model (Caco-2). Methods: Fully differentiated Caco-2 monolayers were subjected enzymatically digested...

10.28982/josam.7585 article EN Journal of Surgery and Medicine 2023-02-03

Grape juice is a fruit that widely consumed due to the bioactive compounds, minerals and aroma components it contains. When processing of black grape juice, aim enrich its compounds using thermosonication process. Surface response methodology (RSM) artificial neural network (ANN) models were used for optimization enrichment. ANN showed superior predictive values (>99%) RSM. Optimal combinations obtained at 40 °C, 12 minutes 65% amplitude thermosonication. Under these conditions, phenolic,...

10.2139/ssrn.4369155 preprint EN 2023-01-01

Koruk, olgunlaşmamış üzümlere verilen isim olup, üzümlerin sıkılmasıyla elde edilen suya koruk suyu veya ekşisi denir. Koruk ekşileri, suyunun çeşitli işlemlerden geçirilmesiyle edilir ve üretiminde standart bir üretim yöntemi bulunmamaktadır. Bu çalışmada aynı zamanda hasat yabani (Vitis vinifera) suları çıkarılıp beş farklı geleneksel yöntemle ekşileri üretilmiş ekşilerin bazı kalite özellikleri belirlenmiştir. Yapılan analizler sonucunda; en yüksek toplam fenolik madde, flavonoid DPPH...

10.21325/jotags.2023.1231 article TR Journal of Tourism and Gastronomy Studies 2023-06-30
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