Evaluation of ultrasound assisted potassium permanganate pre-treatment of spent coffee waste

Ravindran, Rajeev; Jaiswal, Swarna; Abu‐Ghannam, Nissreen; Jaiswal, Amit K.

doi:10.1016/j.biortech.2016.11.034

Cited by 81 publications

(27 citation statements)

References 28 publications

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“…The parameters for maximum reducing sugar production was derived from a study performed previously in our laboratory (Ravindran et al, 2017b). Briefly, the pretreated SCW was hydrolysed by employing a biomass loading of 1%, cellulase and hemicellulase loading of 1.5 ml (23.1 FPU/g of dry biomass) and 0.37 ml (5.33 U/g of dry biomass), respectively while maintaining a pH of 6.7.…”

Section: Enzymatic Hydrolysismentioning

confidence: 99%

Ferric chloride assisted plasma pretreatment of lignocellulose

Ravindran¹,

Sarangapani²,

Jaiswal

et al. 2017

Bioresource Technology

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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.

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Section: Enzymatic Hydrolysismentioning

confidence: 99%

Ferric chloride assisted plasma pretreatment of lignocellulose

Ravindran¹,

Sarangapani²,

Jaiswal

et al. 2017

Bioresource Technology

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“…[4][5][6][7][8] Some of them have suggested the used of SCG as a source of oil for biodiesel production; 5 others have proposed the application of SCG as a source of recoverable sugars that can be extracted and employed as food addictive or for bioethanol production. [9][10][11][12] Several works have reported the study of SCG constituents and their application in the food and nutraceutical industries. 3,8,[13][14][15] In particular, they were focused on caffeine and chlorogenic acids characterization and on total phenolic and flavonoids content.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, in the latest years, several authors have proposed original mechanisms to reuse SCG, in order to manage and reduce its disposal 4–8 . Some of them have suggested the used of SCG as a source of oil for biodiesel production; 5 others have proposed the application of SCG as a source of recoverable sugars that can be extracted and employed as food addictive or for bioethanol production 9–12 . Several works have reported the study of SCG constituents and their application in the food and nutraceutical industries 3,8,13–15 .…”

Section: Introductionmentioning

confidence: 99%

An analytical method for the simultaneous quantification of 30 bioactive compounds in spent coffee ground by HPLC‐MS/MS

et al. 2020

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Spent coffee ground (SCG) is the remaining residue produced after extraction of coffee, and it is considered a source of unextracted bioactive compounds. For this, in the latest years, the attention has been focused to innovative reuses that can exploit the potentiality of SCG. Unfortunately, the content of bioactive compounds has not been thoroughly studied yet, and the major of publication has investigated the caffeine and chlorogenic acids levels, total polyphenol contents, and total flavonoid content. Hence, these approaches have determined only an estimation of flavonoids and polyphenols content and lack on single polyphenols investigation. Therefore, the objective of the current work was to provide a deep characterization of bioactive compounds in SCG. For this purpose, a new analytical method for the quantification of 30 molecules, including caffeine, chlorogenic acids, phenolic acids, flavonoids, and secoiridoids, has been developed using high-performance liquid chromatography tandem mass spectrometry. Moreover, several extraction procedures, that is, liquid-solid extraction assisted and not by ultrasounds, testing diverse solvents, were evaluated. Liquid-solid extraction assisted by sonication, with water/ethanol (30/70, v/v), resulted the best in terms of total bioactive compounds, and, once validated, the new analytical method was applied to five different espresso SCG samples. Data showed that caffeine (means: 1193.886 ± 57.307 mg kg −1) and chlorogenic acids (means of total CQAs: 1705.656 ± 88.694 mg kg −1) were the most abundant compounds in all SCG samples followed by phenolic acids such as caffeic, ferulic, gallic, p-coumaric, syringic, trans-cinnamic, and vanillic acid. Moreover, some flavonoids, that is, rutin, cyanidin 3-glucoside, and quercetin, occurred in almost all samples. This work provided a deepened characterization of bioactive compounds in SCG and can contribute to develop new strategies of reuses.

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“…RSM optimization is useful because it not only expedites the experimental process, taking into account complex interactions between the variables, but it also reduces operation costs [ 12 ]. For these reasons, RSM is routinely used when optimizing enzymatic saccharification of lignocellulosic biomass [ 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

An Investigation into Spent Coffee Waste as a Renewable Source of Bioactive Compounds and Industrially Important Sugars

Scully¹,

Jaiswal²,

Abu‐Ghannam³

2016

Bioengineering

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Conventional coffee brewing techniques generate vast quantities of spent espresso grounds (SEGs) rich in lignocellulose and valuable bioactives. These bioactive compounds can be exploited as a nutraceutical or used in a range of food products, while breakdown of lignocellulose generates metabolizable sugars that can be used for the production of various high-value products such as biofuels, amino acids and enzymes. Response surface methodology (RSM) was used to optimize the enzymatic saccharification of lignocellulose in SEGs following a hydrothermal pretreatment. A maximum reducing sugar yield was obtained at the following optimized hydrolysis conditions: 4.97 g of pretreated SEGs, 120 h reaction time, and 1246 and 250 µL of cellulase and hemicellulase, respectively. Industrially important sugars (glucose, galactose and mannose) were identified as the principal hydrolysis products under the studied conditions. Total flavonoids (p = 0.0002), total polyphenols (p = 0.03) and DPPH free-radical scavenging activity (p = 0.004) increased significantly after processing. A 14-fold increase in caffeine levels was also observed. This study provides insight into SEGs as a promising source of industrially important sugars and polyphenols.

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Evaluation of ultrasound assisted potassium permanganate pre-treatment of spent coffee waste

Cited by 81 publications

References 28 publications

Ferric chloride assisted plasma pretreatment of lignocellulose

Ferric chloride assisted plasma pretreatment of lignocellulose

An analytical method for the simultaneous quantification of 30 bioactive compounds in spent coffee ground by HPLC‐MS/MS

An Investigation into Spent Coffee Waste as a Renewable Source of Bioactive Compounds and Industrially Important Sugars

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