Cashew apple bagasse as a source of sugars for ethanol production by Kluyveromyces marxianus CE025

Abstract

The potential of cashew apple bagasse as a source of sugars for ethanol production by Kluyveromyces marxianus CE025 was evaluated in this work. This strain was preliminarily cultivated in a synthetic medium containing glucose and xylose and was able to produce ethanol and xylitol at pH 4.5. Next, cashew apple bagasse hydrolysate (CABH) was prepared by a diluted sulfuric acid pretreatment and used as fermentation media. This hydrolysate is rich in glucose, xylose, and arabinose and contains traces of formic acid and acetic acid. In batch fermentations of CABH at pH 4.5, the strain produced only ethanol. The effects of temperature on the kinetic parameters of ethanol fermentation by K. marxianus CE025 using CABH were also evaluated. Maximum specific growth rate (μ(max)), overall yields of ethanol based on glucose consumption [Formula: see text] and based on glucose + xylose consumption (Y ( P/S )), overall yield of ethanol based on biomass (Y ( P/X )), and ethanol productivity (P (E)) were determined as a function of temperature. Best results of ethanol production were achieved at 30°C, which is also quite close to the optimum temperature for the formation of biomass. The process yielded 12.36 ± 0.06 g l(-1) of ethanol with a volumetric production rate of 0.257 ± 0.002 g l(-1) h(-1) and an ethanol yield of 0.417 ± 0.003 g g(-1) glucose.

Xylitol production from cashew apple bagasse by Kluyveromyces marxianus CCA510

“…Corncorb [42 ] Bamboo [14] Wood waste [38] Cashew apple bagasse [4] Xylitol concentration (g L Biomass, ethanol and xylitol (g L -1 ) acids as nitrogen sources [21]. Thus, the employment of these nitrogen sources for xylitol production was investigated using CABH-2, the medium that showed the higher xylitol yield.…”

“…Biotechnological production of xylitol from lignocellulosic materials has been extensively investigated in the literature over the last decade, due to the importance of the utilization of these wastes and the possibility of producing value-added products [4,14,37]. Fig.…”

“…Cashew apple bagasse (CAB), which is a byproduct of the juice extraction from the pseudo fruit, represents approximately 20% of its total weight, and is one of the largest sources of wastes in the agronomic industry sector [2,3]. Although some studies investigated the use of this agro industrial byproduct for obtaining value-added products, such as ethanol and xylitol [4][5][6], pectinases [7] and tannases [8], its current utilization has been limited to nutritional supplements for animal feed [9]. Thus, it is necessary to conduct further studies to evaluate their use in the production of high value added products.…”

Removal of Reactive Turquoise Blue Dye from Aqueous Solution Using a Non-Conventional Natural Adsorbent

“…The industrial peduncle processes for juice production results in 40% (w/w) of bagasse, which represents no commercial value and is usually discarded by the local industry. These facts turn cashew apple bagasse (CAB), an alternative and inexpensive raw material for several potential applications (13,14) and dye adsorption using CAB as non-conventional adsorbent can be another possibility.…”

Chemical Composition of the Cashew Apple Bagasse and Potential Use for Ethanol Production

“…This biofuel is currently produced from virtually raw beet and starch, cane sugar and maize, respectively. However, researchers are developing new processes for the most economically viable use of the component of lignocellulosic biomass such as agricultural residues (straw and bagasse of sugar cane, wheat straw and corn stover) and forest residues (dust and waste wood), for production of fuel ethanol (second generation ethanol) [6,7].…”