title: Ultrasound-assisted dilute acid hydrolysis of tea processing waste for production of fermentable sugar.
abstract: Lignocellulosic materials that are the most abundant plant biomass in the world have the potential to become sustainable sources of the produced value added products. Tea processing waste (TPW) is a good lignocellulosic source to produce the value added products from fermentable sugars (FSs). Therefore, the present study is undertaken to produce FSs by using ultrasound-assisted dilute acid (UADA) and dilute acid (DA) hydrolysis of TPW followed by enzymatic hydrolysis. UADA hydrolysis of TPW was optimized by response surface methodology (RSM) at maximum power (900 W) for 2 h. The optimum conditions were determined as 50°C, 1:6 (w/v) solid:liquid ratio, and 1% (w/v) DA concentration, which yielded 20.34 g/L FS concentration. Furthermore, its DA hydrolysis was also optimized by using RSM for comparison and the optimized conditions were found as 120°C, 1:8 solid:liquid ratio, and 1% acid concentration, which produced 25.3 g/L FS yield. Even though the produced sugars with UADA hydrolysis are slightly less, but it can provide significant cost saving due to the lower temperature requirement and less liquid consumption. Besides, enzymatic hydrolysis applied after pretreatments of TPW were very more economic than the conventional enzymatic hydrolysis in the literature due to shorter time requiring. In conclusion, ultrasound-assisted is a promising technology that can be successfully applied for hydrolysis of biomass and can be an alternative to the other hydrolysis procedures and also TPW can be considered as suitable carbon source for the production of value-added products like biofuels, organic acids, and polysaccharides. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:393-403, 2016.
authors.affiliation: Dept. of Food Engineering, Akdeniz University, Antalya, 07058, Turkey.|Dept. of Food Engineering, Cankiri Karatekin University, Cankiri, 18100, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Germec
authors.affiliation: Dept. of Food Engineering, Akdeniz University, Antalya, 07058, Turkey.
authors.forename: Kübra
authors.initials: K
authors.lastname: Tarhan
authors.affiliation: Dept. of Food Engineering, Akdeniz University, Antalya, 07058, Turkey.
authors.forename: Ercan
authors.initials: E
authors.lastname: Yatmaz
authors.affiliation: Dept. of Food Engineering, Akdeniz University, Antalya, 07058, Turkey.
authors.forename: Nedim
authors.initials: N
authors.lastname: Tetik
authors.affiliation: Dept. of Food Engineering, Akdeniz University, Antalya, 07058, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Karhan
authors.affiliation: Dept. of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA.
authors.forename: Ali
authors.initials: A
authors.lastname: Demirci
authors.affiliation: Dept. of Food Engineering, Akdeniz University, Antalya, 07058, Turkey.
authors.forename: Irfan
authors.initials: I
authors.lastname: Turhan
mesh_terms: D000143:Acids / Q000737:chemistry*; D001709:Biotechnology; D002241:Carbohydrates / Q000096:biosynthesis* / Q000737:chemistry; D005285:Fermentation; D006868:Hydrolysis; D013662:Tea / Q000737:chemistry / Q000378:metabolism*; D014465:Ultrasonics; D014866:Waste Products
chemical_list: D000143:Acids; D002241:Carbohydrates; D013662:Tea; D014866:Waste Products
keywords: acid hydrolysis; enzymatic hydrolysis; response surface method; tea processing waste; ultrasound