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2.
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
3.
Chemosphere ; 238: 124512, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31430718

RESUMO

Lindane is an organochlorine pesticide that, due to its persistence in the environment, is still detected in different matrices. Bioremediation using actinobacteria consortia proved to be promising for the restoration of contaminated soils. Another alternative to remove xenobiotics is to use agricultural residues, which stimulates microbial activity, increasing its capacity to degrade organic pollutants. The present work studies the coupling of sugarcane bagasse biostimulation and bioaugmentation with the actinobacteria consortium composed of Streptomyces sp. A2, A5, A11 and M7 on lindane removal in different soil types. In this sense, factorial designs with three factors (proportion and size of sugarcane bagasse particles, and moisture content) were employed. A response optimizer identified the combination of factors levels that jointly allowed obtaining the maximum lindane removal in the evaluated conditions. In the optimal conditions, the effect of the bioremediation process on soil microbiota was studied by evaluating different parameters. The highest lindane removal percentages were detected in biostimulated microcosms bioaugmented with the microbial consortium, which were accompanied by a decrease in lindane half-life respect to the controls. Also, the bioaugmentation of biostimulated microcosms increased the microbial counts and enhanced soil enzymatic activities, corroborating the bioremediation process efficiency. The survival of the four actinobacteria at the end of the assay confirmed the ability of all Streptomyces strains to colonize amended soils. Bioremediation by simultaneous application of biostimulation with sugarcane bagasse and bioaugmentation with the actinobacteria consortium, in the optimized conditions, represents an efficient strategy to restore lindane contaminated soils.


Assuntos
Hexaclorocicloexano/isolamento & purificação , Hexaclorocicloexano/metabolismo , Poluentes do Solo/isolamento & purificação , Poluentes do Solo/metabolismo , Solo/química , Streptomyces/efeitos dos fármacos , Streptomyces/metabolismo , Biodegradação Ambiental/efeitos dos fármacos , Celulose/química , Celulose/farmacologia , Consórcios Microbianos/efeitos dos fármacos , Saccharum/química
4.
Enzyme Microb Technol ; 132: 109384, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31731948

RESUMO

Cellulose triacetate (CTAB) synthesized by cellulose extracted from sugarcane bagasse, and commercial cellulose acetate (CA) were used to produce nanofiber membranes contained bromelain by electrospinning technique. About 1.3 g of cellulose acetate per gram of bagasse were obtained, and both CTAB and CA was characterized by analysis of Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). The nanofiber membranes were produced by electrospinning process testing the following conditions: voltage 25 kV, flow rate 4 mL/h and distance 10 cm, using acetone/ dimethylformamide (DMF) (85:15 m/ m) to 15% cellulose triacetate (70% CA + 30% CTAB) or CA solutions. Scanning Electron Microscopy (SEM) was used to nanofiber membranes characterization. Bromelain was immobilized on the nanofiber membranes by crosslinking with glutaraldehyde and directly in the electrospinning step, the highest activity recovery was about 675% and in vitro controlled release tests were performed to semi-quantitatively evaluate the release of the enzyme bromelain thus demonstrating complete release process in 3 days.


Assuntos
Bromelaínas/química , Celulose/análogos & derivados , Eletroquímica/métodos , Nanofibras/química , Saccharum/química , Varredura Diferencial de Calorimetria , Celulose/química , Enzimas Imobilizadas/química , Microscopia Eletrônica de Varredura , Espectroscopia de Infravermelho com Transformada de Fourier
5.
Carbohydr Polym ; 229: 115449, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-31826526

RESUMO

In this study, the effect and mechanism of myofibrillar protein (MP) gelation influenced by the hydration characteristic of three polysaccharides were studied through puncture test, paraffin section, SEM and Raman spectroscopy. The gel strength and water holding capability reflect that MP gelation only significantly improves until modified starch (MS) addition beyond 1.0%. The MS granule improves MP gel property through simply physical swelling effect. At gelatinization temperature, MS absorbs the moisture nearby to compress the MP three-dimensional networks, but the swelling effect is limited. The insoluble dietary fiber (IDF) improves MP gelation property through moisture stability. The IDF addition could lessen the appearance of moisture channel in MP gel networks and promote the interaction of hydrophobic groups. The MP gelation with 2.0% IDF addition has the highest gel strength (279 g) and water holding capability (91.87%). The konjac glucomannan (KG) (>1.0%) could degrade gel property of MP gelation through interpenetrate structure, because the KG hydrogel hinders the aggregation of the MP gel networks. In conclusion, the IDF, which has strong water-holding capability at room temperature and distribute individually, is the best polysaccharides-based fat replacement in low-fat restructured products.


Assuntos
Fibras na Dieta , Hidrogéis/química , Mananas/química , Proteínas Musculares/metabolismo , Miofibrilas/química , Amido/química , Animais , Substitutos da Gordura/química , Manihot/química , Proteínas Musculares/química , Conformação Proteica/efeitos dos fármacos , Estrutura Secundária de Proteína/efeitos dos fármacos , Saccharum/química , Suínos
6.
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
7.
World J Microbiol Biotechnol ; 35(10): 158, 2019 Oct 08.
Artigo em Inglês | MEDLINE | ID: mdl-31595344

RESUMO

Presence of bacterial contaminants at levels > 107 colony forming units per milliliter (CFU/mL) during ethanol production processes reduces the alcoholic fermentation yield by 30%. Antibiotics are currently used to control contamination, but their residues may be detected in yeast extract, restricting this by-product trade to several countries. Thus, the objective of this study was to assess antimicrobial activity of the natural compounds hops extract, 4-hydroxybenzoic acid, nisin Z, and lysozyme against Lactobacillus fermentum, Leuconostoc mesenteroides, and Saccharomyces cerevisiae, aiming development of a formula. Minimum Inhibitory Concentration of each antimicrobial was determined for bacteria and subsequently, nisin (30 mg/L) and hops extract (5 mg/L) were tested together, showing inhibitory effects combining doses of each antimicrobial that were equivalent to an eightfold reduction of their original Minimum Inhibitory Concentrations (3.75 and 0.625 mg/L, respectively), resulting in a FICIndex of 0.25. Thereon, a formula containing both compounds was developed and tested in fermentation assays, promoting reductions on bacterial population and no severe interferences in yeast viability or population even at extreme doses. Therefore, these compounds have great potential to successfully substitute conventional antibiotics in the ethanol industry.


Assuntos
Anti-Infecciosos/farmacologia , Etanol/metabolismo , Fermentação/fisiologia , Humulus/química , Extratos Vegetais/farmacologia , Antibacterianos/farmacologia , Microbiologia Industrial , Lactobacillales/efeitos dos fármacos , Lactobacillus fermentum/efeitos dos fármacos , Leuconostoc mesenteroides/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Muramidase/farmacologia , Nisina/análogos & derivados , Nisina/farmacologia , Parabenos/farmacologia , Saccharomyces cerevisiae/efeitos dos fármacos , Saccharum/química
8.
Molecules ; 24(19)2019 Oct 08.
Artigo em Inglês | MEDLINE | ID: mdl-31597244

RESUMO

Statistical evidence pointing to the very soft change in the ionic composition on the surface of the sugar cane bagasse is crucial to improve yields of sugars by hydrolytic saccharification. Removal of Li+ by pretreatments exposing -OH sites was the most important factor related to the increase of saccharification yields using enzyme cocktails. Steam Explosion and Microwave:H2SO4 pretreatments produced unrelated structural changes, but similar ionic distribution patterns. Both increased the saccharification yield 1.74-fold. NaOH produced structural changes related to Steam Explosion, but released surface-bounded Li+ obtaining 2.04-fold more reducing sugars than the control. In turn, the higher amounts in relative concentration and periodic structures of Li+ on the surface observed in the control or after the pretreatment with Ethanol:DMSO:Ammonium Oxalate, blocked -OH and O- available for ionic sputtering. These changes correlated to 1.90-fold decrease in saccharification yields. Li+ was an activator in solution, but its presence and distribution pattern on the substrate was prejudicial to the saccharification. Apparently, it acts as a phase-dependent modulator of enzyme activity. Therefore, no correlations were found between structural changes and the efficiency of the enzymatic cocktail used. However, there were correlations between the Li+ distribution patterns and the enzymatic activities that should to be shown.


Assuntos
Celulose/química , Análise Discriminante , Lítio/química , Saccharum/química , Fenômenos Químicos , Hidrólise , Íons/química , Microscopia de Força Atômica , Propriedades de Superfície
9.
J Environ Sci Health B ; 54(9): 791-800, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31554463

RESUMO

Sugarcane vinasse is a by-product obtained during ethanol production in sugar-ethanol plants. For each 1 L of ethanol produced approximately 11 L of vinasse are generated. As this residue is obtained in high amounts, it is used as fertilizer in sugarcane crops. However, despite being rich in nutrients, sugarcane vinasse is approximately one hundred times more polluting than domestic sewage, making it an environmental problem. Thus, the aim of the present study was to propose a treatment sequence for sugarcane vinasse and evaluate the possibility of energetic use of the generated sludge in the coagulation/flocculation stage. pH, conductivity, turbidity and decreases in UV/Vis absorption spectra were determined for each treatment step. In addition, the upper calorific value of the generated sludge was also determined, while ash (adsorption treatment) and catalyst (heterogeneous photocatalysis) characterizations were also carried out. At the end of the treatment, initial vinasse turbidity was reduced by 100% and pH and conductivity values were stabilized. The sludge presented a higher calorific value of approximately 3,000 kcal kg-1 and the ash and catalyst displayed favorable characteristics to be applied to the sugarcane vinasse treatment stages.


Assuntos
Fertilizantes/análise , Eliminação de Resíduos/métodos , Saccharum/química , Resíduos/análise , Poluição Ambiental , Saccharum/crescimento & desenvolvimento
10.
Cien Saude Colet ; 24(8): 2883-2894, 2019 Aug 05.
Artigo em Português, Inglês | MEDLINE | ID: mdl-31389536

RESUMO

This study explores one of the most interesting and least studied issues in Brazil: the consequences of complex and contradictory experiences by replacing the traditional drinks by cachaça, introduced through interethnic contact. Given the rarity of the study of Maxakali alcohol consumption in research, this study aims to understand, from the native's point of view, the negative aftereffect of alcohol consumption. Although anthropological studies emphasize functions of traditional and contemporary drinking as social "lubricants", social perceptions of the Maxakali highlight the problems of cachaça bought through interethnic contact. Symbols and meanings of these consequences were interpreted through their daily life histories, recorded by 21 leaders in focus group. Through the interethnic contact, some adaptations have occurred in the Maxakali alcohol use, with negative consequences for those who drink, their families, their villages and their community. In the world-of-life, these changes these changes can be seen through accidents, insults, marital disharmony, neglects, violent behavior, illness and death. This study's findings highlight the importance of producing comprehensive and in-depth knowledge in search of to identify vulnerable groups and to develop participatory solutions.


Assuntos
Consumo de Bebidas Alcoólicas/epidemiologia , Índios Sul-Americanos/psicologia , Saccharum/química , Adulto , Consumo de Bebidas Alcoólicas/psicologia , Brasil , Feminino , Grupos Focais , Humanos , Índios Sul-Americanos/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Populações Vulneráveis/psicologia , Adulto Jovem
11.
Environ Sci Pollut Res Int ; 26(28): 29267-29282, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31396875

RESUMO

Sugarcane vinasse is the main waste stream of the Brazilian agroindustry. The typical composition of sugarcane vinasse gives it a high polluting potential that implies the necessity to define sustainable strategies for managing this waste. Knowledge of the inorganic and organic composition of vinasse and its seasonal variation is extremely important to conduct scientific research to define alternative managements for vinasse disposal other than fertigation. This study evaluated the variability of vinasse composition throughout the same harvesting season and among three harvesting seasons of one Brazilian annexed biorefinery (2015-2017). The contents of chemical oxygen demand (COD), biochemical oxygen demand (BOD5), total solids (TS), suspended solids (SS), salinity (K+, Na+, Ca2+, Mg2+, Cl-, F-), nutrients (N, P, S), trace metals (Al3+, As2+, Ba2+, Cd2+, Cr3+, Co2+, Cu2+, Fe2+, Pb2+, Mn2+, Hg2+, Mo2+, Ni2+, Se2+, Zn2+), and specific soluble organic compounds (sugars, alcohols, and organic acids), as well as pH and conductivity, were monitored in 13 samples. The results indicated that sugarcane vinasse is a suitable feedstock for biological treatments, such as anaerobic digestion processes for energy recovery, as well as substrate for biomass (e.g., microalgae, energy crops, lignocellulosic biomass) growth. The application of a previous treatment makes vinasse a more environmentally friendly natural fertilizer for land fertigation.


Assuntos
Resíduos Industriais/análise , Saccharum/química , Álcoois/análise , Análise da Demanda Biológica de Oxigênio , Brasil , Indústria Alimentícia , Metais/análise , Compostos Orgânicos/análise , Estações do Ano , Açúcares/análise
12.
Bioresour Technol ; 291: 121844, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31400704

RESUMO

A low-temperature sodium hydroxide (NaOH) pretreatment for sugarcane bagasse (SCB) was obtained via the surface response design in this study. However, a large quantity of water consumption and wastewater generation which have been the common problems for alkaline pretreatment of lignocellulose still exists in this pretreatment. In order to reduce water consumption and wastewater generation, this study attempted to perform enzymatic hydrolysis and fermentation of NaOH-treated SCB without washing process. It showed that after pretreatment and solid-liquid separation, NaOH-treated SCB could be directly hydrolysed by cellulase via pH and solid-liquid adjustment without washing steps, and the maximum enzymatic hydrolysis efficiency could reach to 70.2%. A domesticated Saccharomyces cerevisiae Y2034 which can endure 6-times diluted BL was obtained, and realized 67.5% ethanol yield from the enzymatic hydrolysate of unwashed NaOH-treated SCB. It provided a clue for converting NaOH-treated lignocellulose to ethanol at low water consumption and wastewater generation.


Assuntos
Celulose/química , Etanol/química , Saccharum/química , Hidróxido de Sódio/química , Celulose/metabolismo , Temperatura Baixa , Etanol/metabolismo , Fermentação , Hidrólise , Lignina/química , Lignina/metabolismo , Saccharomyces cerevisiae/metabolismo , Saccharum/metabolismo , Águas Residuárias/química
13.
J Agric Food Chem ; 67(36): 10116-10125, 2019 Sep 11.
Artigo em Inglês | MEDLINE | ID: mdl-31442037

RESUMO

Pseudo-lignin is generated from lignocellulose biomass during pretreatment with dilute sulfuric acid and has a significant inhibitory effect on cellulase. However, the mechanism of pseudo-lignin generation remains unclear. The following main points have been addressed to help elucidate the pseudo-lignin generation pathway. Cellulose and xylan were pretreated with sulfuric acid at different concentrations; aliquots were periodically collected; and the changes in the byproducts of the prehydrolysate were quantified. Milled wood lignin (MWL) mixed with cellulose and xylan was pretreated to evaluate the impact of lignin on pseudo-lignin generation. Furfural, 5-hydroxymethylfurfural, and MWL were pretreated as model compounds to investigate pseudo-lignin generation. The result indicated that the increasing acid concentration significantly promoted the generation of pseudo-lignin. When the acid concentration was increased from 0 to 1.00 wt %, pseudo-lignin was increased from 1.36 to 4.05 g. In addition, lignin promoted the pseudo-lignin generation through the condensation between lignin and the generated intermediates.


Assuntos
Lignina/química , Saccharum/química , Ácidos Sulfúricos/análise , Biotecnologia , Celulose/química , Hidrólise , Madeira/química
14.
Bioresour Technol ; 291: 121839, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31376673

RESUMO

Inorganic salt treatment is a novel, high-yield, and environmentally friendly approach for the production of xylo-oligosaccharides from Sugarcane bagasse with degree of polymerization of 2-5. A xylo-oligosaccharides yield of 53.79% was obtained with 0.1 M MgCl2 treatment at 180 °C/10 min, and 41.89% with 0.1 M FeCl2 treatment at 140 °C/30 min. The xylo-oligosaccharides yield from the co-catalysis of 0.05 M FeCl2 + 0.05 M MgCl2 reached 54.68% (29.34% xylobiose and 20.94% xylotriose) at 140 °C/30 min. The co-catalysis not only effectively improved the xylobiose and xylotriose contents but also increased the total yield of xylo-oligosaccharides under mild reaction conditions. Additionally, the glucose yield observed from the solid residue after inorganic salt treatment was 71.62% by enzymatic hydrolysis. Mg2+ and Fe2+ are essential for good human health without separation from the system, therefore, the inorganic salt treatment can be potentially applied in the co-production of xylo-oligosaccharides and glucose.


Assuntos
Celulose/química , Compostos Ferrosos/química , Cloreto de Magnésio/química , Oligossacarídeos/química , Saccharum/química , Catálise , Glucose/química , Hidrólise , Polimerização
15.
J Food Sci ; 84(9): 2402-2411, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31429486

RESUMO

Diuron is a urea herbicide that is frequently detected in surface water, groundwater, and marine waters. However, there are few methods or guidelines reported on ensuring the quality of sugarcane and soil. In this study, a method was developed for detecting diuron to ensure the quality and safety of food and sugar. Mass spectrometry was used to identify 3,4-dichloroaniline as a marker for the thermal decomposition of diuron, and thus, as a representative component for quantitative diuron analysis. This approach can be used to rapidly detect trace amounts of diuron. In addition, ultrasound-assisted extraction (UAE) and carbon nanotube column purification were used in conjunction with gas chromatography-electron capture detection to detect diuron. The method was then evaluated for its accuracy, detection limit, and viability. The effects of extraction solvent, ultrasound time, and ultrasound power on the extraction efficiency of the analyte from sugarcane and soil were also investigated. The efficiency and optimum conditions of UAE were examined through single-factor experiments and Box-Behnken design (BBD). The optimal extraction conditions were identified as follows: acetonitrile as the extraction solvent, extraction temperature of 27 °C, extraction time of 3.4 min, and ultrasound power of 70 W. Under these conditions, high linearity was achieved for diuron concentrations of 0.01 to 5.0 mg/L, and the purification correlation coefficient was consistently greater than 0.998. Hence, gas chromatography, combined with UAE and BBD, offers superior efficiency extraction, which is sufficiently accurate and precise for pesticide residue analysis. PRACTICAL APPLICATION: We developed an accurate and cost-effective method for detecting diuron (a commonly used herbicide) in soil and sugar samples. We performed experiments to determine the optimum detection conditions for our method. This method can be used for online monitoring of sugar manufacturing processes to ensure food safety and quality.


Assuntos
Cromatografia Gasosa/métodos , Diurona/análise , Herbicidas/química , Saccharum/química , Poluentes do Solo/química , Extração em Fase Sólida/métodos , Ultrassom/métodos , Cromatografia Gasosa/instrumentação , Diurona/isolamento & purificação , Elétrons , Contaminação de Alimentos/análise , Herbicidas/isolamento & purificação , Limite de Detecção , Espectrometria de Massas , Nanotubos de Carbono/química , Resíduos de Praguicidas/química , Resíduos de Praguicidas/isolamento & purificação , Poluentes do Solo/isolamento & purificação , Extração em Fase Sólida/instrumentação
16.
Bioresour Technol ; 289: 121755, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31301946

RESUMO

A novel approach was proposed for the production of xylooligosaccharides by direct pre-hydrolysis using gluconic acid as catalyst. Maximum xylooligosaccharides (degree of polymerization 2-6) yield of 53.2% could be obtained in 60 min through 5% gluconic acid hydrolysis of sugarcane bagasse at 150 °C. Furthermore, the yield of glucose from solids following gluconic acid hydrolysis treatment was 86.2% after fed-batch enzymatic hydrolysis with 10% solids loading. Results indicated that gluconic acid pretreatment combined with enzymatic hydrolysis could be successfully applied to sugarcane bagasse substrate. Subsequently, glucose could be efficiently bio-oxidized to gluconic acid by Gluconobacter oxydans ATCC 621H with 93.1% yield, and sugarcane bagasse derived gluconic acid has been proved to be an effective catalyst for xylooligosaccharides production. In this study, xylooligosaccharides production from sugarcane bagasse by gluconic acid hydrolysis demonstrated a great potential with respect to the production of these probiotics around the world.


Assuntos
Celulose/química , Gluconatos/metabolismo , Glucuronatos/metabolismo , Oligossacarídeos/metabolismo , Saccharum/química , Biocatálise , Glucose/metabolismo , Hidrólise
17.
Food Chem ; 299: 125094, 2019 Nov 30.
Artigo em Inglês | MEDLINE | ID: mdl-31301529

RESUMO

The jaggery-making process involves various thermo-chemical treatments of sugarcane juice. As jaggery making is a traditional practice, knowledge about the use of different chemicals in the process is transferred from generation to generation without much scientific understanding. Phosphoric acid is one of the chemicals commonly used in this process. We have investigated its effect through systematic experiments. The addition of acid causes inversion of sucrose, which beyond a certain point is not desirable for good quality jaggery. In the correct proportions, however, phosphoric acid improves the colour and texture of jaggery and helps in the formation of smaller sized crystals. Reducing sugars formed due to inversion hinder crystal growth, resulting in relatively small crystals. In our experiments, the average crystal size reduced from 22.22 µm to 14.34 µm. Acid-treatedjaggery was found to equilibrate at higher moisture. A comparison with normal jaggery is thus provided for its keeping quality.


Assuntos
Indústria de Processamento de Alimentos/métodos , Ácidos Fosfóricos/química , Extratos Vegetais/química , Saccharum/química , Cor , Cristalização , Flavonoides/química , Monossacarídeos/análise , Extratos Vegetais/análise , Polifenóis/química
18.
Food Chem ; 298: 125032, 2019 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-31260968

RESUMO

A dietary fibre prepared from sugarcane stalk was compared with psyllium husk and wheat dextrin. In contrast to the other dietary fibres, sugarcane fibre was found to contain significant amounts of insoluble dietary fibre (73-86%), lignin (18.66-20.23%), and rare minerals such as chromium (0.67-2.54 mg/100 g) and manganese (1.07-2.34 mg/100 g). Analysis of the ethanol extract also detected compounds with antioxidant activity. Characterisation of five sugarcane fibres prepared from selected strains, harvest periods (growth or storage phase), and processing conditions showed these factors influenced the final composition. Furthermore, using in vitro digestion, we found that potassium, magnesium, chromium, and zinc in were bioaccessible in sugarcane samples. Also, sodium was shown to bind to the sugarcane fibre potentially indicating bile salt binding activity. Results from this study support the use of sugarcane as a source of dietary fibre in functional foods.


Assuntos
Dextrinas/química , Fibras na Dieta/análise , Plantago/química , Saccharum/química , Triticum/química , Antioxidantes/análise , Cromo/análise , Cromo/farmacocinética , Dextrinas/análise , Fibras na Dieta/metabolismo , Indústria de Processamento de Alimentos/métodos , Lignina/análise , Metais/análise , Metais/farmacocinética
19.
Food Chem ; 298: 125036, 2019 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-31260988

RESUMO

Colour removal in raw sugar remains a crucial but expensive process in the sugar industry. In this report, permanganate (MnO4-) oxidation is explored as an alternative method to remove colour-inducing constituents in sugar cane juice/produced raw sugar. Experiments indicated alum, an inexpensive coagulant, was able to remove residual Mn species produced after MnO4- treatment. The optimal dosages of MnO4- and alum for decoloration of a 17 wt% raw sugar solution (70 °C) was found to be 4 mM and 2 g/l, respectively. Removal of colour and Mn removal were further improved at ambient temperature. Sucrose, the major component of raw sugar, was not affected during treatment with MnO4- and alum. Two-phase kinetic behaviour for MnO4- oxidation was observed, where an initial rapid oxidation phase is followed by a second slower reaction phase. These results suggest permanganate oxidation is a promising alternative for accomplishing the decoloration of raw sugar solutions.


Assuntos
Bebidas , Permanganato de Potássio/química , Saccharum/química , Sacarose/química , Cor , Sacarose na Dieta/química , Indústria de Processamento de Alimentos/métodos , Cinética , Manganês/química , Oxirredução
20.
Food Chem ; 301: 125256, 2019 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-31362192

RESUMO

Panela is a natural, unrefined non-centrifugal sugar obtained by intense dehydration of sugarcane juice. Acrylamide, hydroxymethylfurfural (HMF), and furfural were determined in 40 panela samples distributed as granulated and block according to the technological process. Colour, browning, moisture, water activity, pH and antioxidant capacity were also evaluated. Acrylamide ranged between 60 and 3058 µg/kg; granulated panela reporting the highest concentration (812 µg/kg) compared with block panela (540 µg/kg). The lower content in HMF and furfural, the intense dehydration, and the extensive darkening of granulated panela suggested the browning reactions were boosted due to the application of more severe thermal treatments. Principal component analysis showed a significant relationship between the panela presentation and the concentration of the analysed compounds. Benchmark values considering both types of processes would help to establish mitigation initiatives in panela products. The chromatic parameter a* could be used as an indirect index of the acrylamide content in panela.


Assuntos
Acrilamida/análise , Antioxidantes/análise , Fenômenos Químicos , Temperatura Alta , Açúcares/química , Plasmídeos de Bacteriocinas , Cor , Furaldeído/análogos & derivados , Furaldeído/análise , Concentração de Íons de Hidrogênio , Reação de Maillard , Saccharum/química
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