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Oliveira NS, Oliveira AF, Neves AA, Queiroz MELR. Development of a non-titration potentiometric method for the determination of acidity in vinegar. Talanta 2023; 256:124261. [PMID: 36641995 DOI: 10.1016/j.talanta.2023.124261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 01/02/2023] [Accepted: 01/06/2023] [Indexed: 01/13/2023]
Abstract
The acidity of a solution is associated with the concentration of Brønsted acids. This work proposes a new non-titrimetric potentiometric method using citrate buffer for the determination of vinegar acidity. The difference between the pH values before and after the addition of a diluted vinegar sample to 10 mmol L-1 citrate buffer (pH 5.5) was related to the acetic acid concentration. The dynamic range of the quadratic analytical curve was from 3.5 to 20 mmol L-1 (R2 = 0.998). The repeatability was 0.8% for acetic acid at 0.01 mol L-1. Comparison with the conventional titration method showed an error between 0.7% and 4.64% (n = 9) for analysis of commercial vinegar samples The behaviour of the system could be explained using the buffering function.
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Affiliation(s)
- N S Oliveira
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, 37560-000, Brazil
| | - A F Oliveira
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, 37560-000, Brazil.
| | - A A Neves
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, 37560-000, Brazil
| | - M E L R Queiroz
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, 37560-000, Brazil
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2
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Comparison of the Chemical Properties of Vinegar Obtained via One-Step Fermentation and Sequential Fermentation from Dragon Fruit and Pineapple. BEVERAGES 2022. [DOI: 10.3390/beverages8040074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dragon fruit has many potential health benefits. It is inexpensive and widely cultivated in Thailand. The addition of dragon fruit to pineapple vinegar may help enhance the total phenolic compounds and antioxidant activity. This study aimed to study and compare the chemical characteristics of vinegar produced via one-step fermentation of a mixture of pineapple and dragon fruit juice from Krok Phra District of Thailand using Saccharomyces cerevisiae var. burgundy with that obtained using sequential fermentation using Saccharomyces cerevisiae var. burgundy and Acetobacter aceti. When the two fermentation methods were compared on day 20, the maximum acetic acid concentration obtained from sequential fermentation was 5.79 ± 0.25%, which was higher than that obtained in one-step fermentation (1.93%). The total phenolic compound content in the mixed fruit vinegar obtained from sequential fermentation and one-step fermentation was 228.01 and 242.2 mg/L gallic acid equivalents, respectively. The antioxidant content of the products obtained in sequential and one-step fermentations was 187.91 mg/L GAE and 209.33 µg/g of Trolox equivalents, respectively, which was consistent with the total phenolic compound content. This indicated that the acetic acid content in the mixed pineapple and dragon fruit juice vinegar obtained using sequential fermentation was higher than that obtained using one-step fermentation although its total phenolic content and the antioxidant activities were slightly lower. These observations will be useful for improving vinegar fermentation in the area.
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Comparison of the Chemical Properties of Pineapple Vinegar and Mixed Pineapple and Dragon Fruit Vinegar. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8110597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Pineapples are a tropical fruit with high nutritional value and high vitamin and sugar contents. In this study, low-grade pineapples were fermented to produce vinegar using surface culture fermentation (SCF), which involved the addition of dragon fruit juice, to compare the quality and antioxidant activity of different preparations of vinegar. The highest acetic acid concentration (7.35%) was obtained from pineapple vinegar after 20 days of incubation. Vinegar made from mixed pineapple and dragon fruit juice without peel and vinegar with pineapple and dragon fruit juice with peel had acetic acid concentrations of up to 6.20% and 4.50%, respectively. The mixed-fruit vinegar of pineapple and dragon fruit juice with peel displayed the highest antioxidant activity at 210.74 µg/g TE, while no significant difference was found between the other two vinegars (189.52 vs. 187.91 µg/L TE). Notably, the volatile compounds detected in the vinegars were alcohols and esters, which may contribute to the distinct aroma. Overall, the addition of dragon fruit juice with peel to pineapple vinegar increased the phenolic content and antioxidant activity; however, fermentation was slightly slower than that of the other two test materials.
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Saengsen C, Sookbampen O, Wu S, Seetasang S, Rongwong W, Chuaboon L. The potency of HPLC-DAD and LC-MS/MS combined with ion chromatography for detection/purification of levulinic acid and bio-compounds from acid hydrolysis of OPEFB. RSC Adv 2022; 12:28638-28646. [PMID: 36320499 PMCID: PMC9539635 DOI: 10.1039/d2ra03563d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 09/21/2022] [Indexed: 11/05/2022] Open
Abstract
This work reports a new strategy for the detection and purification of levulinic acid (LA) and bio-compounds from the acid hydrolysis and enzymatic treatment of oil palm empty fruit bunch (OPEFB) through high-performance liquid chromatography (HPLC) techniques combined with ion/ligand chromatography. The detections of LA, biomass-saccharides, hydroxymethylfurfural (HMF), and furfural were successfully elucidated by optimizing the multiple reaction monitoring mode (MRM) and liquid chromatography conditions using a Pb2+ ligand exchange column in the liquid chromatography with tandem mass spectrometry (LC-MS/MS) approach. High-performance liquid chromatography with diode-array detection (HPLC-DAD) combined with an H+ ion exchange column also showed potency for detecting chromophoric compounds such as LA, HMF, furfural, and acid (by-products) but not biomass-saccharides. Both techniques showed acceptable validation in terms of linearity, limit of detection (LOD), limit of quantitation (LOQ), accuracy, precision, and stability in both quantitative and qualitative analysis. However, the LC-MS/MS approach showed higher sensitivity for detecting LA and HMF compared with HPLC-DAD. Samples comprised of cellobiose, glucose, HMF, and LA from the acid hydrolysis of cellulose to LA with a mineral acid, and the biocatalysis of cellulase and β-glucosidase catalyzed cellulose (from OPEFB) to glucose were successfully monitored through the LC-MS/MS approach. In addition, using the optimal HPLC conditions obtained from LC-MS/MS, the purification of LA from other substances obtained from the hydrolysis reaction of cellulose (5 g) was successfully demonstrated by HPLC-DAD equipped with a fraction collector combined with an H+ ion exchange column at gram-scale of 1 g LA with a purification rate of 0.63 g ml−1 min−1. The analytical approach for detection and purification levulinic acid from and bio-compound in hydrolysis biomass.![]()
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Affiliation(s)
- Chatcha Saengsen
- Biomass and Oil Palm Center of Excellent, Walailak UniversityNakhon Si Thammarat80160Thailand
| | - Orawan Sookbampen
- Biomass and Oil Palm Center of Excellent, Walailak UniversityNakhon Si Thammarat80160Thailand
| | - Shuke Wu
- College of Life Science and Technology, Huazhong Agricultural UniversityWuhan430070China
| | - Sasikarn Seetasang
- National Nanotechnology Center (NANOTEC), National Science and Technology Development AgencyKhlong LuangPathum Thani 12120Thailand
| | - Wichitpan Rongwong
- Biomass and Oil Palm Center of Excellent, Walailak UniversityNakhon Si Thammarat80160Thailand,School of Engineering and Technology, Walailak UniversityNakhon Si Thammarat80160Thailand
| | - Litavadee Chuaboon
- Biomass and Oil Palm Center of Excellent, Walailak UniversityNakhon Si Thammarat80160Thailand,School of Pharmacy, Walailak UniversityNakhon Si Thammarat80160Thailand
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Jan S, Ahmad J, Dar MM, Wani AA, Tahir I, Kamili AN. Development and validation of a reverse phase HPLC-DAD method for separation, detection & quantification of rutin and quercetin in buckwheat ( Fagopyrum spp .). JOURNAL OF FOOD SCIENCE AND TECHNOLOGY 2022; 59:2875-2883. [PMID: 35734108 PMCID: PMC9206947 DOI: 10.1007/s13197-021-05312-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 05/25/2021] [Accepted: 11/04/2021] [Indexed: 06/15/2023]
Abstract
Buckwheat has tremendous nutraceutical potential owing to its rutin and quercetin content. The aim of this study was to optimise and validate an analytical method for separating and quantifying these two flavonoids from it. Factors, such as range, linearity, precision, accuracy, limit of detection and limit of quantification, were evaluated for the two compounds using high performance liquid chromatography. On the basis of resolution and symmetry, mobile phase consisting of methanol and methanol:water:acetic acid in the ratio of (100:150:5), flow rate 1.3 ml/min and column temperature 30 °C were found to be optimal analytical conditions. Calibration curves exhibited good linearity with correlation coefficient of 0.995 & 0.9907 over the range 60-180 μg/ml & 2-10 μg/ml for rutin and quercetin respectively. LOD and LOQ values for rutin and quercetin were 6.36, 0.58 and 19.28, 1.77 μg/ml respectively. Recovery values of 96-100.8% confirmed that the method was accurate for rutin and quercetin analysis. This validated method was successfully used to analyse rutin and quercetin in leaves and seeds of buckwheat plant.
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Affiliation(s)
- Sabbi Jan
- Cytogenetics & Plant Molecular Biology Laboratory, Department of Botany, University of Kashmir, Srinagar, Jammu and Kashmir India
| | - Javaid Ahmad
- Cytogenetics & Plant Molecular Biology Laboratory, Department of Botany, University of Kashmir, Srinagar, Jammu and Kashmir India
| | - Mohd Masarat Dar
- Department of Food Science & Technology, University of Kashmir, Srinagar, Jammu and Kashmir India
| | - Aijaz A. Wani
- Cytogenetics & Plant Molecular Biology Laboratory, Department of Botany, University of Kashmir, Srinagar, Jammu and Kashmir India
| | - Inayatullah Tahir
- Plant Physiology and Biochemistry Research Laboratory, Department of Botany, University of Kashmir, Srinagar, Jammu and Kashmir India
| | - Azra N. Kamili
- Centre of Research for Development (CORD), University of Kashmir, Srinagar, Jammu and Kashmir India
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Lu C, Dong Y, Ke K, Zou K, Wang Z, Xiao W, Pei J, Zhao L. Modification to increase the thermostability and catalytic efficiency of α-L-rhamnosidase from Bacteroides thetaiotaomicron and high-level expression. Enzyme Microb Technol 2022; 158:110040. [DOI: 10.1016/j.enzmictec.2022.110040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 03/11/2022] [Accepted: 04/04/2022] [Indexed: 01/13/2023]
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Jang D, Jung YS, Kim MS, Oh SE, Nam TG, Kim DO. Developing and Validating a Method for Separating Flavonoid Isomers in Common Buckwheat Sprouts Using HPLC-PDA. Foods 2019; 8:foods8110549. [PMID: 31689931 PMCID: PMC6915543 DOI: 10.3390/foods8110549] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/28/2019] [Accepted: 11/01/2019] [Indexed: 02/06/2023] Open
Abstract
Buckwheat sprouts that are synthesized during the germination process are rich in flavonoids, including orientin, vitexin, rutin, and their isomers (isoorientin, isovitexin, and quercetin-3-O-robinobioside, respectively). The purpose of this study was to optimize and validate an analytical method for separating flavonoid isomers in common buckwheat sprout extract (CSE). Factors, such as range, linearity, precision, accuracy, limit of detection, and limit of quantification, were evaluated for each standard using high-performance liquid chromatography (HPLC). On the basis of resolution and symmetry, a column temperature of 40 °C with 0.1% (v/v) acidic water and acetonitrile as mobile phases, at a flow rate of 1 mL min−1 were determined to be the optimal analytical conditions. Calibration curves for orientin, isoorientin, vitexin, isovitexin, and rutin exhibited good linearity with correlation coefficients of 0.9999 over the 6.25–100.00 μg mL−1 range. Recovery values of 96.67–103.60% confirmed that the method was accurate for all flavonoids. The relative standard deviations of intra-day repeatability and inter-day reproducibility confirmed method preciseness, with values of less than 5.21% and 5.40%, respectively. The developed method was used to analyze flavonoids in CSE, with isomers satisfactorily separated and simultaneously quantified. We demonstrated that the developed HPLC method can be used to monitor flavonoids in buckwheat sprouts.
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Affiliation(s)
- Davin Jang
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Korea.
| | - Young Sung Jung
- Department of Food Science and Biotechnology, Kyung Hee University, Yongin 17104, Korea.
| | - Mi-Seon Kim
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Korea.
| | - Seung Eel Oh
- Korea Food Research Institute, Wanju 55365, Korea.
| | - Tae Gyu Nam
- Korea Food Research Institute, Wanju 55365, Korea.
| | - Dae-Ok Kim
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Korea.
- Department of Food Science and Biotechnology, Kyung Hee University, Yongin 17104, Korea.
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Abstract
Fermentative hydrogen production via dark fermentation with the application of lignocellulosic biomass requires a multistep pre-treatment procedure, due to the complexed structure of the raw material. Hence, the comparison of the hydrogen productivity potential of different lignocellulosic materials (LCMs) in relation to the lignocellulosic biomass composition is often considered as an interesting field of research. In this study, several types of biomass, representing woods, cereals and grass were processed by means of mechanical pre-treatment and alkaline and enzymatic hydrolysis. Hydrolysates were used in fermentative hydrogen production via dark fermentation process with Enterobacter aerogenes (model organism). The differences in the hydrogen productivity regarding different materials hydrolysates were analyzed using chemometric methods with respect to a wide dataset collected throughout this study. Hydrogen formation, as expected, was positively correlated with glucose concentration and total reducing sugars amount (YTRS) in enzymatic hydrolysates of LCMs, and negatively correlated with concentrations of enzymatic inhibitors i.e., HMF, furfural and total phenolic compounds in alkaline-hydrolysates LCMs, respectively. Interestingly, high hydrogen productivity was positively correlated with lignin content in raw LCMs and smaller mass loss of LCM after pre-treatment step. Besides results of chemometric analysis, the presented data analysis seems to confirm that the structure and chemical composition of lignin and hemicellulose present in the lignocellulosic material is more important to design the process of its bioconversion than the proportion between the cellulose, hemicellulose and lignin content in this material. For analyzed LCMs we found remarkable higher potential of hydrogen production via bioconversion process of woods i.e., beech (24.01 mL H2/g biomass), energetic poplar (23.41 mL H2/g biomass) or energetic willow (25.44 mL H2/g biomass) than for cereals i.e., triticale (17.82 mL H2/g biomass) and corn (14.37 mL H2/g biomass) or for meadow grass (7.22 mL H2/g biomass).
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9
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Vasconcelos LTCDP, Oliveira Filho MA, Ribeiro VT, Araújo JSD, de Sousa Junior FC, Martins DRA, Dos Santos ES. Optimization of the 503 antigen induction strategy of Leishmania infantum chagasi expressed in Escherichia coli M15. Prep Biochem Biotechnol 2018; 48:968-976. [PMID: 30489218 DOI: 10.1080/10826068.2018.1525563] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Leishmaniosis is a complex of diseases that can be fatal, if not given proper attention. Despite its relevance in the public health system, there is no vaccine capable of preventing the disease in humans so far and its treatment is expensive and aggressive to human health. The present study aims to optimize the induction parameters of the 503 Leishmania i. chagasi antigen expressed in recombinant Escherichia coli M15. The induction at different cell densities was evaluated in order to analyze the influence of the induction time on the yield of the protein of interest. In this segment, lactose and isopropyl-β-d-thiogalactopyranoside (IPTG) were used as inducer molecules, using various concentrations: 0.1 g/L, 1.0 g/L, and 10 g/L for lactose and 20 μM, 100 μM, 500 μM, and 1000 μM for IPTG. The results presented that the concentration of IPTG that obtained the higher antigen levels was that of 100 μM (0.087 g/L), a 10-fold lower concentration than was being previously used in this type of system and for lactose, it was 1 g/L (0.016 g/L). Thus, the induction with 100 μM allowed obtaining the antigen with a concentration 5.6 times higher than the lactose induction maximum concentration.
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Affiliation(s)
- Luan Tales Costa de Paiva Vasconcelos
- a Biochemical Engineering Laboratory Chemical Engineering Postgraduate Studies Department , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Marcos Antônio Oliveira Filho
- a Biochemical Engineering Laboratory Chemical Engineering Postgraduate Studies Department , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Vitor Troccoli Ribeiro
- a Biochemical Engineering Laboratory Chemical Engineering Postgraduate Studies Department , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Jaciara Silva de Araújo
- a Biochemical Engineering Laboratory Chemical Engineering Postgraduate Studies Department , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Francisco Canindé de Sousa Junior
- a Biochemical Engineering Laboratory Chemical Engineering Postgraduate Studies Department , Federal University of Rio Grande do Norte , Natal , Brazil
| | | | - Everaldo Silvino Dos Santos
- a Biochemical Engineering Laboratory Chemical Engineering Postgraduate Studies Department , Federal University of Rio Grande do Norte , Natal , Brazil
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10
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Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis. ENERGIES 2018. [DOI: 10.3390/en11040886] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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11
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Chen K, Luo G, Lei Z, Zhang Z, Zhang S, Chen J. Chromatographic separation of glucose, xylose and arabinose from lignocellulosic hydrolysates using cation exchange resin. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.12.030] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Kumar S, Ahluwalia V, Kundu P, Sangwan RS, Kansal SK, Runge TM, Elumalai S. Improved levulinic acid production from agri-residue biomass in biphasic solvent system through synergistic catalytic effect of acid and products. BIORESOURCE TECHNOLOGY 2018; 251:143-150. [PMID: 29274853 DOI: 10.1016/j.biortech.2017.12.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/11/2017] [Accepted: 12/12/2017] [Indexed: 06/07/2023]
Abstract
In this study, levulinic acid (LA) was produced from rice straw biomass in co-solvent biphasic reactor system consisting of hydrochloric acid and dichloromethane organic solvent. The modified protocol achieved a 15% wt LA yield through the synergistic effect of acid and acidic products (auto-catalysis) and the designed system allowed facile recovery of LA to the organic phase. Further purification of the resulting extractant was achieved through traditional column chromatography, which yielded a high purity LA product while recovering ∼85% wt. Upon charcoal treatment of the resultant fraction generated an industrial grade target molecule of ∼99% purity with ∼95% wt recovery. The system allows the solvent to be easily recovered, in excess of 90%, which was shown to be able to be recycled up to 5 runs without significant loss of final product concentrations. Overall, this system points to a method to significantly reduce manufacturing cost during large-scale LA preparation.
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Affiliation(s)
- Sandeep Kumar
- Chemical Engineering Division, Center of Innovative and Applied Bioprocessing (CIAB), Sector 81 (Knowledge City), Mohali, Punjab 140306, India; Dr. S. S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh 160014, India
| | - Vivek Ahluwalia
- Chemical Engineering Division, Center of Innovative and Applied Bioprocessing (CIAB), Sector 81 (Knowledge City), Mohali, Punjab 140306, India
| | - Pranati Kundu
- Chemical Engineering Division, Center of Innovative and Applied Bioprocessing (CIAB), Sector 81 (Knowledge City), Mohali, Punjab 140306, India; Dr. S. S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh 160014, India
| | - Rajender S Sangwan
- Chemical Engineering Division, Center of Innovative and Applied Bioprocessing (CIAB), Sector 81 (Knowledge City), Mohali, Punjab 140306, India
| | - Sushil K Kansal
- Dr. S. S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh 160014, India
| | - Troy M Runge
- Wisconsin Energy Institute (WEI), University of Wisconsin-Madison, 1552 University Ave, Madison, WI 53726, USA
| | - Sasikumar Elumalai
- Chemical Engineering Division, Center of Innovative and Applied Bioprocessing (CIAB), Sector 81 (Knowledge City), Mohali, Punjab 140306, India.
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Abstract
The catalytic organosolv pulping of sugar maple bark was performed adopting the concept of forest biorefinery in order to transform bark into several valuable products. Our organosolv process, consisting of pre-extracting the lignocellulosic material followed by pulping with ferric chloride as a catalyst, was applied to sugar maple bark. The pre-extraction step has yielded a mixture of phenolic extractives, applicable as antioxidants. The organosolv pulping of extractives-free sugar maple bark yielded a solid cellulosic pulp (42.3%) and a black liquor containing solubilized bark lignin (24.1%) and products of sugars transformation (22.9% of hemicelluloses), mainly represented by furfural (0.35%) and 5-hydroxymethyl furfural (HMF, 0.74%). The bark cellulosic pulp was determined to be mainly constituted of glucose, with a high residual lignin content, probably related to the protein content of the original bark (containing cambium tissue). The biorefinery approach to the transformation of a solid bark residue into valuable biopolymers (lignin and cellulose) along with phenolic antioxidants from pre-extraction and the HMF derivatives from black liquor (applicable for 2,5-diformylfuran production) is an example of a catalytic process reposing on sustainable engineering and green chemistry concepts.
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14
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Koumba-Yoya G, Stevanovic T. New Biorefinery Strategy for High Purity Lignin Production. ChemistrySelect 2016. [DOI: 10.1002/slct.201601476] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Georges Koumba-Yoya
- Centre de recherche de sur les Matériaux renouvelables, Département des Sciences du bois et de la forêt; Université Laval; Québec, QC Canada
| | - Tatjana Stevanovic
- Centre de recherche de sur les Matériaux renouvelables, Département des Sciences du bois et de la forêt; Université Laval; Québec, QC Canada
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15
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Bhalkikar A, Marin CM, Cheung CL. Method development for separating organic carbonates by ion-moderated high-performance liquid chromatography. J Sep Sci 2016; 39:4484-4491. [DOI: 10.1002/jssc.201600743] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 09/19/2016] [Accepted: 09/26/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Anuja Bhalkikar
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE USA
| | - Chris M. Marin
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE USA
| | - Chin Li Cheung
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE USA
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16
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Soares J, Demeke MM, Foulquié-Moreno MR, Van de Velde M, Verplaetse A, Fernandes AAR, Thevelein JM, Fernandes PMB. Green coconut mesocarp pretreated by an alkaline process as raw material for bioethanol production. BIORESOURCE TECHNOLOGY 2016; 216:744-753. [PMID: 27295252 DOI: 10.1016/j.biortech.2016.05.105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 05/24/2016] [Accepted: 05/25/2016] [Indexed: 06/06/2023]
Abstract
Cocos nucifera L., coconut, is a palm of high importance in the food industry, but a considerable part of the biomass is inedible. In this study, the pretreatment and saccharification parameters NaOH solution, pretreatment duration and enzyme load were evaluated for the production of hydrolysates from green coconut mesocarp using 18% (w/v) total solids (TS). Hydrolysates were not detoxified in order to preserve sugars solubilized during the pretreatment. Reduction of enzyme load from 15 to 7.5 filter paper cellulase unit (FPU)/g of biomass has little effect on the final ethanol titer. With optimized pretreatment and saccharification, hydrolysates with more than 7% (w/v) sugars were produced in 48h. Fermentation of the hydrolysate using industrial Saccharomyces cerevisiae strains produced 3.73% (v/v) ethanol. Our results showed a simple pretreatment condition with a high-solid load of biomass followed by saccharification and fermentation of undetoxified coconut mesocarp hydrolysates to produce ethanol with high titer.
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Affiliation(s)
- Jimmy Soares
- Núcleo de Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, 29040-090 Vitória, Espírito Santo, Brazil
| | - Mekonnen M Demeke
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, KU Leuven, Belgium; Department of Molecular Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
| | - Maria R Foulquié-Moreno
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, KU Leuven, Belgium; Department of Molecular Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
| | - Miet Van de Velde
- Laboratory of Enzyme, Fermentation and Brewing Technology, KAHO Sint-Lieven University College, KU Leuven Association, Gebroeders De Smetstraat 1, 9000 Ghent, Flanders, Belgium
| | - Alex Verplaetse
- Laboratory of Enzyme, Fermentation and Brewing Technology, KAHO Sint-Lieven University College, KU Leuven Association, Gebroeders De Smetstraat 1, 9000 Ghent, Flanders, Belgium
| | - Antonio Alberto Ribeiro Fernandes
- Núcleo de Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, 29040-090 Vitória, Espírito Santo, Brazil
| | - Johan M Thevelein
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, KU Leuven, Belgium; Department of Molecular Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
| | - Patricia Machado Bueno Fernandes
- Núcleo de Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, 29040-090 Vitória, Espírito Santo, Brazil.
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17
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Sun Y, Liu P, Liu Z. Catalytic conversion of carbohydrates to 5-hydroxymethylfurfural from the waste liquid of acid hydrolysis NCC. Carbohydr Polym 2016; 142:177-82. [DOI: 10.1016/j.carbpol.2016.01.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 01/18/2016] [Accepted: 01/26/2016] [Indexed: 10/22/2022]
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Uzuner S, Cekmecelioglu D. Hydrolysis of Hazelnut Shells as a Carbon Source for Bioprocessing Applications and Fermentation. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2014. [DOI: 10.1515/ijfe-2014-0158] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Hazelnut shells are generated in large amounts from hazelnut processing. Currently, it is used as fuel. However, reuse in bioprocessing can release remarkable content of sugars, which can be used for production of additives such as enzymes widely used in the food industry. Thus, the present study was undertaken to determine the effect of single and combined chemical and enzymatic hydrolysis on the production of fermentable sugars from hazelnut shells. Batch hydrolysis was carried out under various conditions to select optimal conditions. The results revealed that an optimal sugar concentration of about 19.2 g/l was achieved after 3.42% (w/w) dilute acid pretreatment conducted at 130°C for 31.7 min and enzymatic load of 200 U/g for 24 h. The overall sugar yield was calculated as 72.4% (g reducing sugar/g total carbohydrate). Therefore, hazelnut shells can be considered a suitable feedstock to compete with synthetic sugars used in fermentations.
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Babauta JT, Nguyen HD, Harrington TD, Renslow R, Beyenal H. pH, redox potential and local biofilm potential microenvironments within Geobacter sulfurreducens biofilms and their roles in electron transfer. Biotechnol Bioeng 2012; 109:2651-62. [PMID: 22549331 DOI: 10.1002/bit.24538] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Revised: 04/10/2012] [Accepted: 04/20/2012] [Indexed: 11/07/2022]
Abstract
The limitation of pH inside electrode-respiring biofilms is a well-known concept. However, little is known about how pH and redox potential are affected by increasing current inside biofilms respiring on electrodes. Quantifying the variations in pH and redox potential with increasing current is needed to determine how electron transfer is tied to proton transfer within the biofilm. In this research, we quantified pH and redox potential variations in electrode-respiring Geobacter sulfurreducens biofilms as a function of respiration rates, measured as current. We also characterized pH and redox potential at the counter electrode. We concluded that (1) pH continued to decrease in the biofilm through different growth phases, showing that the pH is not always a limiting factor in a biofilm and (2) decreasing pH and increasing redox potential at the biofilm electrode were associated only with the biofilm, demonstrating that G. sulfurreducens biofilms respire in a unique internal environment. Redox potential inside the biofilm was also compared to the local biofilm potential measured by a graphite microelectrode, where the tip of the microelectrode was allowed to acclimatize inside the biofilm.
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Affiliation(s)
- Jerome T Babauta
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, PO Box 642710, Pullman, Washington 99164-2710, USA
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