title: Evaluation of ultrasound assisted potassium permanganate pre-treatment of spent coffee waste.
abstract: In the present study, novel pre-treatment for spent coffee waste (SCW) has been proposed which utilises the superior oxidising capacity of alkaline KMnO4assisted by ultra-sonication. The pre-treatment was conducted for different exposure times (10, 20, 30 and 40min) using different concentrations of KMnO4(1, 2, 3, 4, 5%w/v) at room temperature with solid/liquid ratio of 1:10. Pretreating SCW with 4% KMnO4and exposing it to ultrasound for 20min resulted in 98% cellulose recovery and a maximum lignin removal of 46%. 1.7 fold increase in reducing sugar yield was obtained after enzymatic hydrolysis of KMnO4pretreated SCW as compared to raw. SEM, XRD and FTIR analysis of the pretreated SCW revealed the various effects of pretreatment. Thermal behaviour of the pretreated substrate against the native biomass was also studied using DSC. Ultrasound-assisted potassium permanganate oxidation was found to be an effective pretreatment for SCW, and can be a used as a potential feedstock pretreatment strategy for bioethanol production.
authors.affiliation: School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland.
authors.forename: Rajeev
authors.initials: R
authors.lastname: Ravindran
authors.affiliation: Centre for Research in Engineering and Surface Technology, FOCAS Institute, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
authors.forename: Swarna
authors.initials: S
authors.lastname: Jaiswal
authors.affiliation: School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland.
authors.forename: Nissreen
authors.initials: N
authors.lastname: Abu-Ghannam
authors.affiliation: School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland. Electronic address: amit.jaiswal@dit.ie.
authors.forename: Amit K
authors.initials: AK
authors.lastname: Jaiswal
mesh_terms: D000468:Alkalies / Q000737:chemistry; D018533:Biomass; D002241:Carbohydrates / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D003069:Coffee / Q000737:chemistry*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D011196:Potassium Permanganate / Q000737:chemistry*; D013010:Sonication; D013696:Temperature; D014465:Ultrasonics / Q000379:methods*
chemical_list: D000468:Alkalies; D002241:Carbohydrates; D003069:Coffee; D011196:Potassium Permanganate; D002482:Cellulose; D008031:Lignin
keywords: Alkaline potassium permanganate; Biomass pretreatment; Lignocellulose; Reducing sugar; Spent coffee waste; Ultrasonication