Ali Demirci

Prof. Ali Demirci

Pennsylvania State University
orcid

Research Focus & Metrics

Academic Career Length

35Years (1992-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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14 July 2013 in Cellulose
Verified
Journal Article
Closed access
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Shin-Ping LinShin-Ping Lin
Shin-Ping Lin
ILIris Loira
Iris Loira
JCJeffrey M. Catchmark
Jeffrey M. Catchmark
JLJe-Ruei Liu
Je-Ruei Liu
Ali DemirciAli Demirci
Ali Demirci
KCKuanChen Cheng
KuanChen Cheng

29 July 2011 in Applied Microbiology and Biotechnology
Verified
Journal Article
Closed access
PDF file
KCKuanChen Cheng
KuanChen Cheng
Ali DemirciAli Demirci
Ali Demirci
JCJeffrey M. Catchmark
Jeffrey M. Catchmark

30 January 2008 in Comprehensive Reviews in Food Science and Food Safety
Verified
Journal Article
Closed access
PDF file
KKKathiravan Krishnamurthy
Kathiravan Krishnamurthy
HKHarpreet Kaur Khurana
Harpreet Kaur Khurana
SJSoojin Jun
Soojin Jun
JIJoseph Irudayaraj
Joseph Irudayaraj
Ali DemirciAli Demirci
Ali Demirci


25 April 2008 in Food and Bioprocess Technology
Verified
Journal Article
Closed access
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KKKathiravan Krishnamurthy
Kathiravan Krishnamurthy
JTJagdish C. Tewari
Jagdish C. Tewari
JIJoseph Irudayaraj
Joseph Irudayaraj
Ali DemirciAli Demirci
Ali Demirci

24 July 2009 in Journal of Biological Engineering
Verified
Journal Article
Open access
PDF file
KCKuanChen Cheng
KuanChen Cheng
JCJeffrey M. Catchmark
Jeffrey M. Catchmark
Ali DemirciAli Demirci
Ali Demirci
Bacterial cellulose has been used in the food industry for applications such as low-calorie desserts, salads, and fabricated foods. It has also been used in the paper manufacturing industry to enhance paper strength, the electronics industry in acoustic diaphragms for audio speakers, the pharmaceutical industry as filtration membranes, and in the medical field as wound dressing and artificial skin material. In this study, different types of plastic composite support (PCS) were implemented separately within a fermentation medium in order to enhance bacterial cellulose (BC) production by Acetobacter xylinum. The optimal composition of nutritious compounds in PCS was chosen based on the amount of BC produced. The selected PCS was implemented within a bioreactor to examine the effects on BC production in a batch fermentation. The produced BC was analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). Among thirteen types of PCS, the type SFYR+ was selected as solid support for BC production by A. xylinum in a batch biofilm reactor due to its high nitrogen content, moderate nitrogen leaching rate, and sufficient biomass attached on PCS. The PCS biofilm reactor yielded BC production (7.05 g/L) that was 2.5-fold greater than the control (2.82 g/L). The XRD results indicated that the PCS-grown BC exhibited higher crystallinity (93%) and similar crystal size (5.2 nm) to the control. FESEM results showed the attachment of A. xylinum on PCS, producing an interweaving BC product. TGA results demonstrated that PCS-grown BC had about 95% water retention ability, which was lower than BC produced within suspended-cell reactor. PCS-grown BC also exhibited higher T max compared to the control. Finally, DMA results showed that BC from the PCS biofilm reactor increased its mechanical property values, i.e., stress at break and Young's modulus when compared to the control BC. The results clearly demonstrated that implementation of PCS within agitated fermentation enhanced BC production and improved its mechanical properties and thermal stability.