mehmet kalender

mehmet kalender

Firat Üniversitesi

H-index: 5

Asia-Turkey

About mehmet kalender

mehmet kalender, With an exceptional h-index of 5 and a recent h-index of 4 (since 2020), a distinguished researcher at Firat Üniversitesi, specializes in the field of bioethanol production and vocs removal by adsoption.

His recent articles reflect a diverse array of research interests and contributions to the field:

Determination of Total Phenolic and Flavonoid Content and Total Antioxidant Capacity of Ficus elastica Callus Cultures

Investigation of the thin layer drying of micropropagated Ocimum basilicum L: Modeling by derived equations, quality characteristics, and energy efficiency: Original scientific …

Şeker Pancarı Melasından Escherichia coli KO11 Suşu ile Biyoetanol Üretimi: Enzimatik Hidroliz ve Kesikli Fermantasyon

A novel static cultivation of bacterial cellulose production from sugar beet molasses: Series static culture (SSC) system

Determination of Total Antioxidant Capacity of Corylus avellana L.(Hazel) Leaves Collected from the Elazığ/Keban Region

Effects of Pre-Extraction Processes on Total Antioxidant Activity, Phenolic Content and Flavonoid Content of Tomato (Solanum lycopersicum) Leaves

Chlorella vulgaris Biyokütle Üretiminde Kültür Şartlarının Optimizasyonu

Optimization of acid hydrolysis conditions of spent black tea waste and bioethanol production by Escherichia coli KO11.

mehmet kalender Information

University

Firat Üniversitesi

Position

___

Citations(all)

69

Citations(since 2020)

38

Cited By

41

hIndex(all)

5

hIndex(since 2020)

4

i10Index(all)

3

i10Index(since 2020)

1

Email

University Profile Page

Firat Üniversitesi

mehmet kalender Skills & Research Interests

bioethanol production and vocs removal by adsoption

Top articles of mehmet kalender

Determination of Total Phenolic and Flavonoid Content and Total Antioxidant Capacity of Ficus elastica Callus Cultures

Authors

Abayhan BURAN,Aykut TOPDEMİR,Mehmet KALENDER

Published Date

2023

In this study, the total phenolic substance amount, total flavonoid substance amount and total antioxidant activity of the callus culture obtained from the leaf explant of F. elastica plant using plant growth regulators in MS medium were investigated. Ethanol, methanol and pure water were used as solvents in the study. The total amount of phenolic substances was calculated according to the Folin-Ciocalteu method. AlCl3 method was used in total flavonoid substance content analysis and ABTS method was used in total antioxidant capacity analysis. Results are shown in terms of gallic acid equivalent, quercetin equivalent, and trolox equivalent antioxidant capacity, respectively. Comparisons of bioactive components according to solvents were made. In addition, the amounts of bioactive substances and antioxidant capacities obtained from callus and plant leaves were compared. The highest result for the total phenolic substance amount was obtained from the ethanol extract of the leaf material as 49.20±0.14 mg/g GAE. The highest result for the total amount of flavonoid substance was again obtained from the ethanol extract of the leaf material as 28.07±0.09 mg/g QE. The highest result for total antioxidant activity was obtained from the ethanol extract of callus material as 10.77±0.11 mmol/g TEAC. There have been analyzes where each solvent gave better results. Importantly, F. elastica callus cultures have been found to have significant bioactive substance content.

Investigation of the thin layer drying of micropropagated Ocimum basilicum L: Modeling by derived equations, quality characteristics, and energy efficiency: Original scientific …

Authors

Mehmet Kalender,Aykut Topdemir

Journal

Chemical Industry & Chemical Engineering Quarterly

Published Date

2023/6/4

This study presents the modeling of thin layer drying of micropropagated Ocimum basilicum L., some quality characteristics of the dried product, and energy consumption analysis for the dryer used. The experimental drying data obtained from a previous article were used in the statistical analyses. Modeling studies were statistically carried out using the experimental data at a 1 m/s airflow rate and a temperature of 30 C—50 C. The statistical analysis showed that the Verma equation was the best-fit model with the lowest chi-square (χ 2) and AIC values at all temperatures studied. From statistical analyses using derived drying models, it was found that the D9 equation having a χ 2 value of 0.0146 and an AIC value of-528.0, was the best model fitting to experimental data. The total phenolic content, flavonoid, and antioxidant capacity of dried basil samples were measured as(2.538±0.029) mg GAE/g,(2.017±0.088) mg quercetin/g, and(2.263±0.001) mmol TEAC/100 g dw, respectively. From FTIR spectra, dried basil samples had typical functional groups. SEM images showed that a collapse in the surface of the leaves occurred. But, this collapse is not affecting the functional groups on the surface of the leaves. From energy consumption analyses, the optimum drying temperature was found to be 40 C. The SMER, MER, and SEC values calculated from energy consumption analysis at 40 C were 0.0043 kg/kWh, 0.0007 kg/h, and 234.81 kWh/kg, respectively.

Şeker Pancarı Melasından Escherichia coli KO11 Suşu ile Biyoetanol Üretimi: Enzimatik Hidroliz ve Kesikli Fermantasyon

Authors

Nur Kevser DOĞAN,Mehmet KALENDER

Journal

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

Published Date

2023/3/3

Bu çalışmada, şeker pancarı melasından fermantasyonla biyoetanol üretimi incelenmiştir. Bu amaçla, iki aşamalı deneysel çalışma gerçekleştirilmiştir: Melasın enzimatik hidrolizi ile basit şekerlerin üretilmesi ve hidrolizattan E.coli KO11 ile biyoetanol üretilmesi. Enzimatik hidroliz deney parametreleri (melas konsantrasyonu, enzim konsantrasyonu ve süre) cevap yüzey metodu (RSM) ile optimize edilmiştir. Cevap değişkeni olarak indirgen şeker konsantrasyonu seçilmiştir. Fermantasyon deneyleri aneorobik kesikli sistemde yürütülmüştür. RSM-ANOVA testleri ile enzimatik hidroliz için kuadratik modelin en uygun model olduğu belirlenmiştir. İncelenen tüm bağımsız değişkenlerin model üzerinde etkili olduğu, ikili etkileşimlerden sadece konsantrasyon-süre ikili etkileşiminin model üzerinde etkili olmadığı ve süre kuadratik etkisinin önemli olduğu sonuçlarına ulaşılmıştır. Enzimatik hidroliz için optimum deneysel parametre değerleri 87,7 g/L melas konsantrasyonu, %0,45 (v/v) enzim konsantrasyonu ve 15,93 saat olarak belirlenmiştir. Optimum şartlarda melastaki sakarozun yaklaşık %96’sı enzimatik hidrolizle basit şekerlere dönüştürülmüştür. Fermantasyon deneyleri sonucunda, 24. Saat sonunda maksimum biyoetanolün 0,489 g/g verimle üretildiği belirlenmiştir.

A novel static cultivation of bacterial cellulose production from sugar beet molasses: Series static culture (SSC) system

Authors

Yunus Emre Öz,Mehmet Kalender

Journal

International Journal of Biological Macromolecules

Published Date

2023/1/15

In bacterial cellulose (BC) production, we developed a new static cultivation system named series static culture (SSC) to eliminate air limitation problem encountered in conventional static culture (CSC). In SSC system, the fermentation broth at the bottom of BC pellicle produced in initial culture medium is transferred to the next empty sterile culture medium at the end of a certain fermentation period. This procedure was performed until BC production ceased. Fermentation experiments were carried out using Gluconacetobacter xylinus NRRL B-759 and sugar beet molasses at 30 °C and initial pH 5. Also, some quality parameters of produced BC pellicles were determined. Final pH at the stages of SSC system was higher that of the initial pH due to sugar content (sucrose) of molasses and microorganism used. Total BC production increased with increasing sugar concentration in SSC. As a result, an increase of 22.02 …

Determination of Total Antioxidant Capacity of Corylus avellana L.(Hazel) Leaves Collected from the Elazığ/Keban Region

Authors

Abayhan BURAN,Aykut TOPDEMİR,Mehmet KALENDER

Published Date

2023

The objective of this study was to introduce the overall bioactive content (total antioxidant capacity, total flavonoid content and total phenolic content) of fresh and healthy leaves of Corylus avellana L.(Hazel) obtained from the Elazığ/Keban region in September. The hazelnut leaves were dried in an oven at 55℃ for 48 hours. Then, a thermal pretreatment was performed by using two different methods which are microwave and infrared techniques. The C. avellana L. samples were subjected to extraction treatment. The extraction was separately carried out using ethanol and water. The total phenolic content, the total flavonoids, and the total antioxidant capacity were determined using the Folin-Ciocalteu method (Gallic Acid Equivalent, GAE), the AlCl3 method (quercetin equivalent, QE), and ABTS method (Trolox Equivalent Antioxidant Capacity, TEAC), respectively. As a result, the total phenolic content value of the hazelnut studied was calculated as 37.95±0.51 mg/g GAE. The flavonoid content was measured as 68.10±0.585 mg/g QE. Finally, the total antioxidant capacity was 10.92±0.02 mmol/g TEAC. In light of all these findings, it might be said that C. avellana L. leaves studied have considerable quantities of bioactive compounds.

Effects of Pre-Extraction Processes on Total Antioxidant Activity, Phenolic Content and Flavonoid Content of Tomato (Solanum lycopersicum) Leaves

Authors

Abayhan BURAN,Aykut TOPDEMİR,Mehmet KALENDER

Published Date

2023

In this study, it was aimed to extract the leaves of the tomato (Solanum lycopersicum) plant grown from seeds and to calculate the amount of bioactive substances contained in these extracts. After the leaves were collected from the plant, some of them were subjected to infrared moisture removal pretreatment and some were microwave heat treated. A comparison was made using the traditional extraction process as a control. Two different solvents (ethanol 99%, and distilled water) were used in the extraction. Total phenolic content, total flavonoid content and total antioxidant activity of the tomato plant leaf extracts were measured. ABTS method, AlCl3 method and Folin-Ciocalteu method, which are generally preferred in the studies, were used in the analysis. The highest results were shown as Trolox Equivalent Antioxidant Capacity (10.61±0.14 mmol/g TEAC) for total antioxidant capacity, Gallic Acid Equivalent (35.74±1.47 mg/g GAE) for total phenolic content, and Quercetin Equivalent (72.73±2.43 mg/g QE) for total flavonoid content. Comparative graphs are presented to compare pre-extraction processes and solvents. The study revealed that the leaf extracts of the tomato plant have bioactive content and antioxidant activity. It has been revealed that a more detailed optimization study is needed for the effect of pre-processes on the amount of bioactive components.

Chlorella vulgaris Biyokütle Üretiminde Kültür Şartlarının Optimizasyonu

Authors

Mehmet Kalender,Sümeyye Bürkev

Journal

International Journal of Engineering Research and Development

Published Date

2022/7/7

Bu çalışmada, C. vulgaris mikroalgal biyokütle üretiminin optimizasyonu incelenmiştir. Optimizasyon çalışmaları Design Expert programında Cevap Yüzey Metodu (RSM) ile oluşturulan deneysel çalışma tablosuna göre gerçekleştirilmiştir. Her bir deney 250 mL’lik erlenlerde 12 saat aydınlık (3000 lüx) 12 saat karanlık ve 25 °C’de yürütülmüştür. RSM deneylerinde bağımsız değişkenler olarak kültür hacmi, inokülasyon oranı ve kültür süresi; cevap değişkeni olarak ise üretilen algal biyokütle konsantrasyonu seçilmiştir. Algal biyokütle konsantrasyonları UV-Visible spektroskopisi ile ölçülmüştür. Optimizasyon çalışmaları sonucunda mikroalgal biyokütle üretimini en iyi temsil eden modelin kuadratik olduğu belirlenmiştir. Kuadratik model için ANOVA testlerinden geliştirilen model üzerinde çalışılan üç bağımsız değişkenin de önemli olduğu görülmüştür. Bununla beraber, inokülasyon oranının diğer bağımsız değişkenlere göre daha az etkili olduğu, hatta bu parametrenin kuadratik etkisinin model üzerinde etkili olmadığı saptanmıştır. Model üzerinde en etkili bağımsız değişkenin ise süre olduğu sonucuna ulaşılmıştır. RSM analizlerinden model üzerinde kültür hacmi-inokülasyon oranı ikili etkileşiminin önemli olduğu gözlenmiştir. İkili etkileşim grafiğinden çalışılan aralıkta yüksek inokülasyon oranı ve düşük kültür hacmi değerlerinde algal biyokütle konsantrasyonunun yüksek olduğu sonucuna varılmıştır. RSM ile ileri sürülen optimum C. vulgaris biyokütle üretim şartları 85,693 mL kültür hacmi, %12,152 inokülasyon oranı ve 16,952 gün süre olarak belirlenmiştir.

Optimization of acid hydrolysis conditions of spent black tea waste and bioethanol production by Escherichia coli KO11.

Authors

Ahmet Yazıcıoğlu,Mehmet Kalender

Journal

Environmental Engineering & Management Journal (EEMJ)

Published Date

2022/3/1

Tea is among the most consumed beverages in the world. Spent tea wastes have been occurred in the world due to high consumption. Because of cellulose, hemicellulose, and lignin, they can be named as lignocellulosic biomass. The reducing sugars are obtained from the lignocellulosic biomass using acid hydrolysis. The aim of this study was to investigate bioethanol production from spent black tea hydrolyzate by fermentation using Escherichia coli (E. coli) KO11, which can metabolize sugars with 5 and 6 carbons simultaneously, in a batch system. The spent tea samples were subjected to acid hydrolysis in order to obtain reducing sugars. The acidic hydrolysis conditions were optimized with Response Surface Method (RSM) based on Central Composite Design (CCD). The reducing sugar concentration obtained from optimization studies for the spent tea wastes was 20.5 g/L from the batch system of 50 mL …

A Novel Screw Type Pyrolysis System for Selectively Producing of the Value-Added Chemicals from Lignocellulosic Biomass

Authors

Hamdi Soner Altundoğan,Muhammet Şaban Tanyıldızı,Serhat Elçiçek,Mehmet Kalender,Dursun Pehlivan

Journal

Available at SSRN 4011159

Published Date

2022

In this study, a new unique screw-type (auger) reactor system was developed to selectively obtain valuable chemicals-enriched liquid pyrolysis products. The new design has heating segments with increased temperature along the reactor tube and three-staged condensing lines following pyrolysis gas ports at the end of each heating segment. To maximize liquid product yield, effects of some parameters such as feeding rate, screw rate and temperature profile were studied by the experiments designed with Response Surface Methodology (RSM). By fixing the maximum temperature at the last heating segment of tubular reactor is to 550◦ C, the conditions for maximum liquid product yield were determined as feeder driver set value of 21 (13.6 rpm), auger driver set value of 36 (24.3 rpm) and ΔT value (temperature difference between consecutive heating segments) of 66◦ C. Feeding rate of biomass and volumetric fullness ratio of reactor at these conditions are 42 g min-1 and 0.58 (v/v), respectively. Under these conditions, total liquid, solid and gas product yields were obtained as to be 57%, 19% and 24%, respectively. In addition, analysis of the liquid fractions showed that it is possible to obtain the valuable chemicals selectively in a large extent by using new designed system.

OPTIMIZATION OF BACTERIAL CELLULOSE PRODUCTION FROM SUGAR BEET MOLASSES BY GLUCONACETOBACTER XYLINUS NRRL B-759 IN STATIC CULTURE

Authors

Chia Hui Ch'ng,Mohd Redza Abd Rahman,Ida Idayu Muhamad,Norhayati Pa'e,Dayang Norulfairuz Abang Zaidel

Journal

CET Journal-Chemical Engineering Transactions

Published Date

2020/2/1

Bacterial cellulose or Nata is produced using pineapple waste as substrate for the fermentation process by Acetobacter xylinum. This study was aimed to optimize the production of bacterial cellulose in static and agitated condition. Production of bacterial cellulose in agitated condition has been performed at different rpm, with and without adding micro particles. The fermentation conditions were set at pH 5.0 and 28 C. The highest bacterial cellulose formation is obtained from agitated condition with additional micro particles at 120 rpm whereas the bacterial cellulose weight is increased by 70.23% compared to the static condition. The addition of microparticles helped in increasing the bacterial cellulose formation by 15.19%. From the optimization using Design Expert®, yeast extracts and potassium dihydrogen phosphate (KH2 PO4) are the most significant factors affecting the bacterial cellulose production. From the …

Modelling to Predict Moisture Ratio in Infrared Drying of Machine Plaster by Particle Swarm Optimization

Authors

Mehmet Kalender,Mahmut Temel Özdemir,Hasan Güler

Journal

Current Physical Chemistry

Published Date

2020

Background Gypsum plaster is one of the most important building materials. The use of gypsum plasters is very common due to their many advantages. The drying process is an important stage in the production of gypsum materials and applications. Modelling of drying phenomenon can benefit drying technology. Recently, Particle Swarm Optimization (PSO) technique has been used to obtain optimum model equations for drying processes. Objective The aim of this study was to determine a new modeling approach to infrared drying of machine plaster by using PSO. Methods Experimental studies supplied by previous work in the literature have been performed by a laboratory scale infrared dryer in the temperature range of 50-70°C and at atmospheric conditions. Experimental moisture ratio values were compared with various mathematical model equations developed for the drying process by using Particle Swarm …

See List of Professors in mehmet kalender University(Firat Üniversitesi)

mehmet kalender FAQs

What is mehmet kalender's h-index at Firat Üniversitesi?

The h-index of mehmet kalender has been 4 since 2020 and 5 in total.

What are mehmet kalender's top articles?

The articles with the titles of

Determination of Total Phenolic and Flavonoid Content and Total Antioxidant Capacity of Ficus elastica Callus Cultures

Investigation of the thin layer drying of micropropagated Ocimum basilicum L: Modeling by derived equations, quality characteristics, and energy efficiency: Original scientific …

Şeker Pancarı Melasından Escherichia coli KO11 Suşu ile Biyoetanol Üretimi: Enzimatik Hidroliz ve Kesikli Fermantasyon

A novel static cultivation of bacterial cellulose production from sugar beet molasses: Series static culture (SSC) system

Determination of Total Antioxidant Capacity of Corylus avellana L.(Hazel) Leaves Collected from the Elazığ/Keban Region

Effects of Pre-Extraction Processes on Total Antioxidant Activity, Phenolic Content and Flavonoid Content of Tomato (Solanum lycopersicum) Leaves

Chlorella vulgaris Biyokütle Üretiminde Kültür Şartlarının Optimizasyonu

Optimization of acid hydrolysis conditions of spent black tea waste and bioethanol production by Escherichia coli KO11.

...

are the top articles of mehmet kalender at Firat Üniversitesi.

What are mehmet kalender's research interests?

The research interests of mehmet kalender are: bioethanol production and vocs removal by adsoption

What is mehmet kalender's total number of citations?

mehmet kalender has 69 citations in total.

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