Ferric chloride assisted plasma pretreatment of lignocellulose

Abstract

In this study, a novel pretreatment for spent coffee waste (SCW) has been proposed which combines two techniques viz. atmospheric air plasma and FeCl to create a superior pretreatment that involves Fenton chemistry. The pretreatment was optimised employing Taguchi Design of Experiments, and five parameters were taken into consideration viz. biomass loading, FeCl concentration, HSO concentration, plasma discharge voltage and treatment time. The composition analysis of the pretreated SCW revealed substantial amounts of lignin removal, with a maximum for process conditions of 70kV for 2min in an acidic environment containing 1% HSO. FTIR, XRD and DSC were performed to characterise the samples. The pretreated SCW after enzymatic hydrolysis yielded 0.496g of reducing sugar/g of SCW. The hydrolysate was subjected to fermentation by S. cerevisiae and led to the production of 18.642g/l of ethanol with a fermentation efficiency of 74%, which was a two fold increase in yield compared to the control.

Investigation of alkaline hydrogen peroxide pretreatment and Tween 80 to enhance enzymatic hydrolysis of sugarcane bagasse

“…This result suggested that the hemicellulose degradation was faster than delignification during NaOH or AHP pretreatment, which did not decrease the lignin content in pretreated substrates. The peak at 898 cm −1 attributed to the β-glycosidic linkages in cellulose, became intensive after pretreatment, which was in agreement with the increment of glucan after pretreatment, as confirmed in Table 1 [28]. Taken together, the FT-IR analysis was in accordance with the chemical analysis data, retained the major cellulose in pretreated substrates by selective breaking functional groups and chemical bonds, and presented an enhanced exposure of cellulose for enzyme accessibility because of the degradation of hemicellulose and lignin [7].…”

Polysaccharides production from soybean curd residue via Morchella esculenta

“…The solubility of PMP in ethanol, water, acetone, methyl alcohol, chloroform, and diethyl ether was assessed in accordance with the British pharmacopoeia specification (Kannan, Manivannan, Balasubramaniam, & Kumar, ). The nature of PMP was demonstrated by Ferric chloride test (Ravindran, Sarangapani, Jaiswal, Cullen, & Jaiswal, ), Iodine test and Felhing’s test (Xu et al, ). The protein, uronic acid, and total sugar content in PMP were, respectively, assayed by Coomassie brilliant blue method, sulphuric acid‐carbazole spectrophotometric method, and phenol‐sulfuric acid method (Kong et al, ).…”

Coffee and Yeasts: From Flavor to Biotechnology

“…Moreover, obtaining fatty acid ethyl esters rather than fatty acid methyl esters increased the overall renewability [69]. Another approach to valorize the SCG introduced a combination atmospheric air plasma and FeCl 3, in order to create a superior pretreatment that involve Fenton chemistry for a more effective delignification prior to enzymatic treatment and bioethanol production by S. cerevisiae [70]. Using S. cerevisiae, bioethanol was also obtained from other wastes such as coffee juice and mucilage.…”