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2.
Chemosphere ; 250: 126267, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32114344

RESUMO

Biological methods for the removal of hexavalent chromium (Cr(VI)) from contaminated sites are safe and efficient. This is especially true because they employ microorganisms and nutrients. The use of appropriate nutrients is important for the methods to be economically feasible. This paper aims to investigate the role of polyphenol from sugarcane molasses, an inexpensive material derived from the waste of the sugar industry, as a nutrient that efficiently provides carbon for Cr(VI)-removing bacteria. The colored constituents of sugarcane molasses were characterized based on the activity of Cr(VI)-reduction and the support of bacterial growth. Molasses promoted Cr(VI)-reducing activity in a pH dependent manner. The activity was related to the colored constituents, excluding sugar, by using absorbent-column chromatography. Moreover, the activity was closely related to the polyphenol fractions, which were slightly different from those of the colored constituents. Unlike the colored constituents, the isolated sugar was sufficient to support the growth of bacteria. Polyphenols from sugarcane molasses could reduce Cr(VI) with no effect on bacterial growth. The removal of Cr(VI) combining molasses and Cr(VI)-reducing bacteria may present an additive and/or synergistic effect.


Assuntos
Biodegradação Ambiental , Cromo/química , Polifenóis/química , Bactérias/metabolismo , Carbono , Melaço , Nutrientes , Oxirredução , Saccharum
3.
Food Chem ; 314: 126180, 2020 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-31954937

RESUMO

The antioxidant activity of sugarcane molasses ethanol extract (ME) and its fraction (ME-RBF) was evaluated using ABTS, ORAC 6.0 and CAA assays and ME-RBF demonstrated 26-fold, 12-fold and 2-fold higher values, respectively than ME. Likewise, total polyphenol and flavonoid concentration in ME-RBF are more than 10-fold higher than ME, that suggested antioxidant activity is correlated with polyphenol composition. Quantitative analysis of 13 polyphenols (chlorogenic acid, caffeic acid, sinapic acid, syringic acid, vanillin, homoorientin, orientin, vitexin, swertisin, diosmin, apigenin, tricin and diosmetin) was carried out by LCMS. MS/MS analysis allowed the tentative identification of seven apigenin-C-glycosides, three methoxyluteolin-C-glycosides and three tricin-O-glycosides some of which have not been reported in sugarcane before to the best of our knowledge. The results demonstrated that sugarcane molasses can be used as potential source of polyphenols that can be beneficial to health.


Assuntos
Antioxidantes/análise , Antioxidantes/farmacologia , Melaço/análise , Polifenóis/análise , Saccharum/química , Antioxidantes/química , Glicosídeos/análise , Células Hep G2 , Humanos , Extratos Vegetais/análise , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Polifenóis/farmacologia , Espectrometria de Massas em Tandem
4.
Bioresour Technol ; 301: 122764, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31958691

RESUMO

The sucrose metabolic genes (scrA, scrB and scrK) from C. acetobutylicum ATCC 824 were successfully overexpressed in C. tyrobutyricum ATCC 25755, endowing it with the ability to co-utilize sucrose, fructose and glucose in the cane molasses. As a result, the engineering strain C. tyrobutyricum ATCC 25755/scrBAK produced 18.07 g/L and 18.98 g/L butyric acid when sucrose and cane molasses were used as the carbon source, respectively. Furthermore, the medium composition and initial cane molasses concentration were optimized to make full use of the untreated cane molasses. Based on these results, 45.71 g/L butyric acid with a yield of 0.39 g/g was obtained in fed-batch fermentation, and the feedstock cost of using untreated cane molasses was decreased by ~47% when compared with the conventional glucose fermentation. This study demonstrated the potential application of C. tyrobutyricum ATCC 25755/scrBAK for economic butyric acid production from untreated cane molasses.


Assuntos
Clostridium tyrobutyricum , Ácido Butírico , Bengala , Fermentação , Melaço
5.
Bioresour Technol ; 302: 121974, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31981808

RESUMO

A technology utilizes bacteria Enterobacter sp. SL grown in an anaerobic reactor with waste molasses as carbon source to bio-reduce hexavalent chromium [Cr(VI)] in wastewater and then remove total chromium has been developed. The performance was elucidated through different initial and operating experiments conditions, and the associated mechanism of Cr(VI) reduction was explained. Results show that Cr(VI) removal is 99.91% at 25 h in the anaerobic reactor initially containing bacteria of 5% (v/v), (NH4)2Fe(SO4)2·6H2O of 0.5 g·L-1, waste molasses of 2.5 g·L-1, Cr(VI) of 100 mg·L-1, pH of 6.0, and with the operational temperature of 45 °C. After 120 h reaction, Cr(total) removal reached 91.10%. The major reduction products [FeS, Cr2O3, Cr(OH)3, S0 granules] together with microbes was removed by sludge separation with Cr(VI) in the supernatant (0.027 mg·L-1) being much lower than that (not excess 0.2 mg·L-1) of Electroplating Pollutant Emission Standard.


Assuntos
Carbono , Melaço , Cromo , Enterobacter , Oxirredução , Esgotos , Águas Residuárias
6.
Bioresour Technol ; 302: 122797, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31981810

RESUMO

In this study, two bacteria strains (Enterobacter sp. SL and Acinetobacter sp. SL-1) and waste molasses (carbon source) were used to remove Zn(II), Cd(II), Cr(VI), and Cr(Total) in the liquid solution (87 mg·L). The results showed the removal efficiencies of Cr(Total) and Cr(VI) could reach over 98.00% after reaction, and the removal efficiencies of Zn(II) and Cd(II) were all about 90.00% by the synergistic actions of microorganisms and waste molasses. In this process, waste molasses provides nutrients for microorganisms and has the characteristics and capability of Cr, Zn, and Cd. Microorganisms mainly use biological adsorption (36.95% and 45.69%) and metabolism (24.37% and 17.05% by producing humic-acid and fulvic-acid like substances) to remove Zn(II) and Cd(II), while waste molasses could to remove Cr(Total) (81.24%) and Cr(VI) (75.90%). This study has potential application value for the treatment of wastewater containing high concentrations of heavy metals.


Assuntos
Metais Pesados , Poluentes Químicos da Água , Adsorção , Substâncias Húmicas , Melaço , Eliminação de Resíduos Líquidos , Águas Residuárias
7.
Bioresour Technol ; 297: 122412, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31776105

RESUMO

This research evaluated the effect of molasses (M), cellulosic enzymes (E) and lactic acid bacteria (LAB) alone or in combination (M + LAB and E + LAB) on the fermentation quality, microbial counts, chemical composition and in vitro degradability of rice straw silages in different silo densities (200, 300, 400 and 500 kg/m3). The M or E groups alone increased the dry matter (DM) losses at low silo densities. Acetic acid produced by LAB-related groups significantly inhibited yeast and mould at the silo density of 300 kg/m3. Under high silo densities (>400 kg/m3), LAB-related additives significantly improved the fermentation quality and reduced the DM losses. The use of E + LAB further improved the in vitro degradability of rice straw silages at high silo densities. In conclusion, higher silo density and appropriate complex additives were of great significance to improve the quality of rice straw silage.


Assuntos
Oryza , Silagem , Fermentação , Lactobacillus , Melaço
8.
Bioresour Technol ; 298: 122523, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31830657

RESUMO

Low H2 yield from biomass impedes the industrial application of biohydrogen production. To improve H2 yield, the effect of Ginkgo biloba leaf (GL) on H2 production was investigated in this study. In batch fermentation with sugarcane molasses (SM), the addition of GL improved H2 yield by 28.03%. SM medium was optimized with response surface methodology (RSM) to determine the best concentrations of GL, SM, and an inexpensive nitrogen source-corn steep liquor (CSL). A maximum yield of 1.58 mol-H2/mol-hexose from SM was obtained when GL, CSL and SM hexose were 2.31 g/L, 2.28 g/L and 10 g/L, respectively. As observed with metabolic flux analysis, GL enhanced H2 conversion from SM via altering the metabolic flux distribution of E. harbinense from ethanol pathway towards acetate pathway. This study demonstrated the promotion effect of GL on H2 production from SM, raising a novel method for enhanced biohydrogen production in large scales.


Assuntos
Melaço , Saccharum , Fermentação , Ginkgo biloba , Folhas de Planta
9.
Food Chem ; 303: 125405, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31466029

RESUMO

The study aimed at evaluating the influence of fermented sugarcane molasses ageing on lees and the distillation process used for the production of rums. Molasses were freshly fermented or 3-months lees aged. Batch (PS: Pot Still) or continuous (CS: Coffey Still) distillation was carried out resulting in four different rum distillates. Gas chromatography and 3D-fluorescence enabled to differentiate rum distillates chemical composition according to the distillation process, regardless of the ageing on lees of fermented molasses. Differences in fluorescent PARAFAC components and volatile acids, acetals and carbonyls contents revealed the predominance of the physicochemical processes driven at the liquid-vapor interface of fermented molasses, generated by the distillation systems. Notwithstanding the distilling conditions, the long chain fatty ester content was significantly higher in the 3-months lees aged condition. Multivariate analysis highlighted that CS rum distillates were chemically more homogeneous than those obtained by PS that preserved the lees effect.


Assuntos
Bebidas Alcoólicas/análise , Destilação/métodos , Manipulação de Alimentos/métodos , Melaço/análise , Saccharum/química , Cromatografia Gasosa , Fermentação , Fatores de Tempo
10.
J Chem Ecol ; 45(11-12): 982-992, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31784860

RESUMO

Plants have evolved intricate defence strategies against herbivore attack which can include activation of defence in response to stress-related volatile organic compounds (VOCs) emitted by neighbouring plants. VOCs released by intact molasses grass (Melinis minutiflora), have been shown to repel stemborer, Chilo partellus (Swinhoe), from maize and enhance parasitism by Cotesia sesamiae (Cameron). In this study, we tested whether the molasses grass VOCs have a role in plant-plant communication by exposing different maize cultivars to molasses grass for a 3-week induction period and then observing insect responses to the exposed plants. In bioassays, C. partellus preferred non-exposed maize landrace plants for egg deposition to those exposed to molasses grass. Conversely, C. sesamiae parasitoid wasps preferred volatiles from molasses grass exposed maize landraces compared to volatiles from unexposed control plants. Interestingly, the molasses grass induced defence responses were not observed on hybrid maize varieties tested, suggesting that the effect was not simply due to absorption and re-emission of VOCs. Chemical and electrophysiological analyses revealed strong induction of bioactive compounds such as (R)-linalool, (E)-4,8-dimethyl-1,3,7-nonatriene and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene from maize landraces exposed to molasses grass volatiles. Our results suggest that constitutively emitted molasses grass VOCs can induce direct and indirect defence responses in neighbouring maize landraces. Plants activating defences by VOC exposure alone could realize enhanced levels of resistance and fitness compared to those that launch defence responses upon herbivore attack. Opportunities for exploiting plant-plant signalling to develop ecologically sustainable crop protection strategies against devastating insect pests such as stemborer C. partellus are discussed.


Assuntos
Compostos Orgânicos Voláteis/química , Zea mays/metabolismo , /química , Animais , Produtos Agrícolas , Feminino , Cromatografia Gasosa-Espectrometria de Massas/métodos , Herbivoria , Interações Hospedeiro-Parasita , Melaço , Mariposas/parasitologia , Oviposição/efeitos dos fármacos , Compostos Orgânicos Voláteis/metabolismo , Vespas/fisiologia , Zea mays/parasitologia
11.
J Agric Food Chem ; 67(49): 13665-13672, 2019 Dec 11.
Artigo em Inglês | MEDLINE | ID: mdl-31686508

RESUMO

Fructooligosaccharides (FOSs) are excellent food ingredients or feed additives by stimulating probiotics. In this paper, a CREA gene encoding a glucose repressor in the ß-fructofuranosidase producer Aureobasidium melanogenum 33 with high-level FOS biosynthesis was disrupted, and glucose repression in disruptant D28 was relieved. The disruptant D28 produced up to 2100 U/mL of ß-fructofuranosidase activity, whereas the enzyme activities produced by parent strain 33 and complemented strain C11 were below 600 U/mL. The whole cells of the disruptant D28 was used to convert cane molasses into FOSs, and 0.58 g of FOSs/g of molasses sugar was synthesized from 350 g/L cane molasses sugar within 4 h. Results demonstrated that the industrial waste cane molasses can be efficiently converted into FOSs by the glucose derepression mutant D28 with high ß-fructofuranosidase activity. This low-cost and environmentally friendly bioprocess has great potential applications in bioengineering and biotechnology for FOS production.


Assuntos
Ascomicetos/metabolismo , Proteínas Fúngicas/metabolismo , Melaço/análise , Oligossacarídeos/biossíntese , Saccharum/microbiologia , beta-Frutofuranosidase/genética , Ascomicetos/enzimologia , Ascomicetos/genética , Proteínas Fúngicas/genética , Regulação Fúngica da Expressão Gênica , Glucose/metabolismo , Mutação , Saccharum/metabolismo , beta-Frutofuranosidase/metabolismo
12.
J Environ Manage ; 251: 109565, 2019 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-31557669

RESUMO

Low cost whey salt medium (WSM) and molasses salt medium (MSM) have been constructed utilizing food processing byproduct whey and molasses for the production of bio-polysaccharide chitosan from Rhizopus oryzae and subsequently comprehensive physico-chemical characterization of the fungal chitosan has been carried out using various analytical tools to apprehend its biochemical utility. Same has been repeated with chitosan from conventional potato dextrose broth (PDB) for comparison purpose. The yields of chitosan in three different media were 0.62 (WSM), 0.39 (MSM) and 0.63 (PDB) g/L respectively. Molecular weights of the chitosans were in the range of 100-300 kDa. WSM-chitosan and MSM-chitosan were less polydispersed, possessed more hydrated polymorph and loose crystal packing than PDB-chitosan. This indicate that WSM-chitosan and MSM-chitosan are highly exposed to the external reagent hence more reactive to the external reagents with compare to PDB-chitosan. Literature suggest isolated chitosans are useful for specific drug delivery applications.


Assuntos
Quitosana , Manipulação de Alimentos/métodos , Rhizopus/metabolismo , Melaço , Soro do Leite
13.
J Sci Food Agric ; 99(14): 6649-6654, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31368529

RESUMO

BACKGROUND: This study evaluated the degradation of pyrrolizidine alkaloids (PAs) from eastern groundsel (Senecio vernalis) in grass silage prepared with different inoculants. Silages were produced from ryegrass with 230 g kg-1 dry matter (DM) content and mixed with eastern groundsel (9:1; w/w fresh matter basis) containing 5.5 g kg-1 DM PA. Treatments were: CON (untreated control), LP (3.0 × 105 cfu g-1 Lactobacillus plantarum DSMZ 8862/8866) or LBLC (7.3 × 104 cfu g-1 Lactobacillus buchneri LN40177 / Lactobacillus casei LC32909), and each of the treatments in combination with 30 g kg-1 molasses. Silages were prepared in glass jars and opened after 3, 10, and 90 days. Fermentation characteristics were determined and the PAs analyzed. RESULTS: Although the levels of fermentation acids differed between treatments, results indicated good quality of all silages during 90 days. Significant time (P < 0.001) and treatment (P < 0.001) effects were observed for PAs. Concentrations of senecionine and seneciphylline decreased with molasses, declined over time, and were negatively correlated with lactic, propionic, and butyric acid, or with lactic and butyric acid in case of seneciphylline. In all silages, seneciphylline and senecionine N-oxides were undetectable after 3 days, whereas senkirkine, the most abundant PA, remained stable. CONCLUSIONS: Silage prepared from grass contaminated with eastern groundsel still contained high PA levels, and was hence a potential health hazard. Molasses supplementation reduced concentrations of senecionine and seneciphylline, while the bacterial inoculants had no effect. Other potentially toxic PA metabolites were not analyzed in the present study and further research is needed. © 2019 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.


Assuntos
Ração Animal/análise , Manipulação de Alimentos/métodos , Lolium/química , Alcaloides de Pirrolizidina/química , Senécio/química , Silagem/análise , Ração Animal/microbiologia , Fermentação , Lactobacillus/metabolismo , Lactobacillus plantarum/metabolismo , Lolium/microbiologia , Melaço/análise , Alcaloides de Pirrolizidina/metabolismo , Alcaloides de Pirrolizidina/toxicidade , Senécio/toxicidade , Silagem/microbiologia
14.
Bioresour Technol ; 289: 121699, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31323726

RESUMO

In this work, we propose a Mixed Integer Nonlinear Programming (MINLP) model to determine the optimal design of a poly(hydroxyalkanoate)s (PHAs) production plant configuration. The superstructure based optimization model considers different carbon sources as raw material: glycerol (crude and purified), corn starch, cassava starch, sugarcane sucrose and sugarcane molasses. The PHA extraction section includes four alternatives: the use of enzyme, solvent, surfactant-NaOCl or surfactant-chelate. Model constraints include detailed capital cost for equipment, mass and energy balances, product specifications and operating bounds on process units. The resulting MINLP model maximizes the project net present value (NPV) as objective function and it is implemented in an equation oriented environment. Optimization results show the sugarcane-enzyme option as the most promising alternative (NPV = 75.01 million USD) for PHAs production with an energy consumption of 22.56 MJ/kg PHA and a production cost of 3.02 USD/kg PHA. Furthermore, an economic sensitivity analysis is performed.


Assuntos
Poli-Hidroxialcanoatos/biossíntese , Carbono/metabolismo , Glicerol/metabolismo , Melaço , Amido/metabolismo
15.
Bioresour Technol ; 290: 121750, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31325842

RESUMO

Production of androstenedione (AD) and 9α-hydroxyandrostenedione (9α-OH-AD) by recombinant mycobacteria using untreated cane molasses and hydrolysate of mycobacterial cells (HMC) was investigated for the first time. B-vitamins feeding experiment and reverse transcription-PCR analysis showed that propionyl-CoA carboxylase (PCC) plays an important role in the phytosterol biotransformation of mycobacteria. The respective AD and 9α-OH-AD conversion ratios were increased by 2.91 and 1.48 times through coexpression of PCC and NADH dehydrogenase. The highest conversion ratios of AD and 9α-OH-AD obtained by using a co-feeding strategy of cane molasses and HMC reached 96.38% and 95.04%, respectively, and the total costs of carbon and nitrogen sources for the culture medium were reduced by 29.89% and 49.49%, respectively. Taking the results together, untreated cane molasses and HMC can be used for the economical production of steroidal pharmaceutical precursors by mycobacteria. This study offers an economical and green strategy for steroidal pharmaceutical precursor production.


Assuntos
Melaço , Mycobacterium , Androstenodiona , Bengala , Nitrogênio
16.
J Biotechnol ; 303: 37-45, 2019 Sep 10.
Artigo em Inglês | MEDLINE | ID: mdl-31351109

RESUMO

Consecutive dark-fermentation and photo-fermentation stages were investigated for a profitable circular bio-economy. H2 photo-production versus poly(3-hydroxybutyrate) (P3HB) accumulation is a modern biotechnological approach to use agro-food industrial byproducts as no-cost rich-nutrient medium in eco-sustainable biological processes. Whey and molasses are very important byproducts rich in nutrients that lactic acid bacteria can convert, by dark-fermentation, in dark fermented effluents of whey (DFEW) and molasses (DFEM). These effluents are proper media for culturing purple non-sulfur bacteria, which are profitable producers of P3HB and H2. The results of the present study show that Lactobacillus sp. and Rhodopseudomonas sp. S16-VOGS3 are two representative genera for mitigation of environmental impact. The highest productivity of P3HB (4.445 mg/(L·h)) was achieved culturing Rhodopseudomonas sp. S16-VOGS3, when feeding the bacterium with 20% of DFEM; the highest H2 production rate of 4.46 mL/(L·h) was achieved when feeding the bacterium with 30% of DFEM.


Assuntos
Lactobacillus/crescimento & desenvolvimento , Melaço/microbiologia , Rodopseudomonas/crescimento & desenvolvimento , Soro do Leite/microbiologia , Técnicas de Cultura Celular por Lotes , Fermentação , Hidrogênio/metabolismo , Hidroxibutiratos/análise , Lactobacillus/metabolismo , Fotobiorreatores/microbiologia , Poliésteres/análise , Rodopseudomonas/metabolismo
17.
Appl Biochem Biotechnol ; 189(4): 1084-1095, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31161384

RESUMO

Yellowfin tuna by-products (Thunnus albacares) were processed to produce radical-scavenging peptides from hydrolysis by lactic acid fermentation (LAF) with Lactobacillus plantarum, papaya fruit (Carica papaya), and molasses as a carbon source for 72 h. A 15-kDa peptide was purified; after de novo sequencing, it was determined that fragments are rich in hydrophobic and neutral amino acids. The results suggest this effect is mainly to the hydrophobicity of the amino acids in their sequence. Further work is on progress to assess the ability of peptides to provide stability in lipids or in other types of samples sensitive to the action of free radicals.


Assuntos
Depuradores de Radicais Livres , Ácido Láctico/metabolismo , Peptídeos , Análise de Sequência de Proteína , Atum , Animais , Carica/química , Depuradores de Radicais Livres/química , Depuradores de Radicais Livres/isolamento & purificação , Frutas , Lactobacillus plantarum/crescimento & desenvolvimento , Melaço , Peptídeos/química , Peptídeos/genética , Peptídeos/isolamento & purificação
18.
J Environ Manage ; 246: 42-50, 2019 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-31174029

RESUMO

Composting is a biological process in which the organic matter is degraded by the mixed population of microorganisms in a moist aerobic environment to more stable and humidified end products. The composting process involves an interaction between the organic waste, microorganisms, moisture and oxygen. The molasses-based biomethanated distillery wastewater is presently effectively utilized with sugarcane pressmud through the composting process. The aim of present work was to evaluate the effect of ozone pretreatment on the rate of composting process and the quality of compost obtained. The GC-MS & FTIR analysis of ozone pretreated wastewater indicated the degradation and/or transformation of the organic compounds to simpler compounds present in the wastewater. Composting was performed by mixing fixed weight ratios of pressmud and different ratios of ozone pretreated wastewater (1:3, 1:4 and 1:5). The composting process was found to occur faster in the ozone pretreated wastewater for all the ratios as compared to the untreated wastewater. The final compost characteristics were found to be optimum for the 1:3 and 1:4 ratios of pressmud and wastewater. The bio-oxidative phase duration of composting has been reduced for the ozone pretreated wastewater.


Assuntos
Compostagem , Ozônio , Melaço , Oxirredução , Águas Residuárias
19.
Food Chem ; 297: 124897, 2019 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-31253291

RESUMO

Fructooligosaccharides have important potential use in the food industry due to their properties such as solubility in water, stability in acidity of fruit juices and during storage, low-calorie value and prebiotic effects. In this study, for the first time, Zymomonas mobilis levansucrase was used for in situ 6-kestose production in carob molasses. The produced kestose was stable during storage at 20 °C for 4 months. The product was evaluated for color, non-enzymatic browning index and titratable acidity during storage and the quality of the product was found comparable to that of control. Furthermore, the decreased amount of sucrose resulted in the prevention of 5-hydroxymethylfurfural (5-HMF) formation during storage. As a result, carob molasses was converted into a high-quality prebiotic product with decreased sucrose content and reduced 5-HMF quantities, and a new method was developed to prevent 5-HMF formation in fruit juices and molasses.


Assuntos
Galactanos/metabolismo , Hexosiltransferases/metabolismo , Mananas/metabolismo , Gomas Vegetais/metabolismo , Prebióticos/análise , Trissacarídeos/metabolismo , Zymomonas/enzimologia , Armazenamento de Alimentos , Sucos de Frutas e Vegetais/análise , Furaldeído/análogos & derivados , Furaldeído/química , Furaldeído/metabolismo , Melaço/análise
20.
Waste Manag ; 89: 236-246, 2019 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-31079736

RESUMO

A blended feedstock containing food waste and coal was used to perform co-hydrothermal carbonization (Co-HTC) at different temperatures to observe the effect of temperature on the solid fuel properties of different hydrochars. Moreover, these hydrochars were mixed with molasses which act as a binder to prepare high mechanical strength pellets. A range of techniques was used to characterise the hydrochars and pellets. Food waste and coal hydrochars produced at 300 °C exhibited high heating value (HHV) of 31.1 and 31.4 MJ/kg respectively, however, high heating value of the Co-HTC 300 °C hydrochar decreased to 28.6 MJ/kg. The ash content of hydrochar obtained via the Co-HTC at 300 °C, was 53% less than the ash content of raw coal. Combustion results showed that the Co-HTC of food waste and coal is thermally more suitable than HTC of food waste and coal. During pelletization molasses played an important role in making solid bridge between the hydrochars. The tensile strength of all the hydrochars ranged between 2 and 4.5 MPa. The blend treated at 300 °C showed the highest tensile strength of 4.5 MPa. The mass density of food waste and blend increased as the temperature was increased, however, the mass density of the coal sample showed a decreasing trend. The energy densities of all the hydrochars ranged between 22.2 and 39 GJ/m3 and the energy density of the blends were higher than the coal and food waste hydrochar.


Assuntos
Carbono , Carvão Mineral , Alimentos , Melaço , Temperatura
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