Ginger and turmeric starches hydrolysis using subcritical water + CO2: the effect of the SFE pre-treatment

Moreschi, Silvania Regina Mendes; Leal, J. C.; Braga, Mara E.M.; Meireles, M. Angela A.

doi:10.1590/s0104-66322006000200011

Cited by 42 publications

(13 citation statements)

References 11 publications

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“…At subcritical condition, water acts as an acid or base catalyst because of the presence of H 3 O ? and OH -at higher concentration than in ambient temperature [27]. Subcritical water, therefore, has better catalytic activity to breakdown the complex carbohydrate molecules into simple sugar molecules.…”

Section: Model For Hydrolysismentioning

confidence: 99%

Subcritical water hydrolysis of durian seeds waste for bioethanol production

et al. 2015

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The feasibility of bioethanol production using durian seed waste was investigated in this study. The effects of hydrolysis parameters (temperature, time, pressure and solid to water ratio) on the yields of reducing sugars and bioethanol were also examined. Central composite design was used to determine the optimum conditions of both reducing sugars yields obtained from hydrolysis stage and ethanol from reducing sugars fermentation. The optimized values for subcritical water process of durian seeds to produce reducing sugars were achieved at temperature of 139.8°C; solid to water ratio of 1:30; pressure of 30 bar; and reaction time of 3.58 h with 32.37 % yield of reducing sugars. The fermentation of 20 g L -1 reducing sugars for 72 h gave the highest ethanol concentration, i.e., 9.85 g L -1 .

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Section: Model For Hydrolysismentioning

confidence: 99%

Subcritical water hydrolysis of durian seeds waste for bioethanol production

et al. 2015

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“…Kandungan karbohidrat dalam ekstrak jahe merah adalah sebesar 53,5% (Shimoda, 2006). Beberapa penelitian menyebutkan bahwa jahe mengandung gula pereduksi, diantaranya adalah heksosa (Moreschi et al, 2006;Nandan et al, 2015). Heksosa merupakan monosakarida dengan 6 atom karbon dengan rumus kimia C 6 H 12 O 6 , salah satu anggota gula heksosa adalah fruktosa yang banyak ditemukan pada tanaman (Preddy, 2012).…”

Section: Hasil Dan Pembahasan Ekstraksi Dan Fraksinasiunclassified

Total Phenolic and Flavonoid Content, and Antioxidant Capacity of Red Ginger (Zingiber officinale var. Rubrum) Ethanolic Extract and Fraction

et al. 2018

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Determination of total phenolic, total flavonoid, and antioxidant capacity of ethanolic extract and fractions from red ginger (Zingiber officinale var. Rubrum) has been done. Red gingers contain the highest oleoresins among other ginger varieties. Oleoresins are component that had the most responsibility for pharmacological effect of red ginger, one of them is as antioxidant. Phenolic and flavonoid are highly contributing to the antioxidant effect of red ginger. The aim of this research is to determine the antioxidant capacity of extract and fractions of red ginger, and to investigate the correlation between antioxidant capacity with both total phenolic and total flavonoid. Ethanolic extracts are fractinationed with n-hexane, chloroform, ethyl acetate, n-butanol, and methanol solvent. Antioxidant capacity, total phenolic, and total flavonoid of all the samples are measured. Highest antioxidant capacity, total phenolic, and total flavonoid obtained from ethyl acetate fraction with TEAC 2143.9 ± 0.9 µmol/g (CUPRAC) and 4526.4 ± 3.0 (DPPH), GAE 229.9 ± 1.3 mg/g, and QE 46,6 ± 1,8 mg/g. One way ANOVA and post hoc analysis show significant result with p value <0,01. Pearson correlation shows high positive correlation. Determination of total phenolic, total flavonoid, antioxidant capacity from ethanolic extract and fractions of red ginger (Zingiber officinale var. Rubrum) has been done.Red ginger contain the highest oleoresins among other ginger varieties. Oleoresins are component that had the most responsibility for pharmacological effect of red ginger, one of them is as antioxidant. Phenolic and flavonoid are highly contribute to the antioxidant effect of red ginger. The aim of this research is to determine the antioxidant capacity of extract and fractions of red ginger, and to investigate the correlation between antioxidant capacity with both total phenolic and total flavonoid. Ethanolic extracts are fractinationed with n-hexane, chloroform, ethyl acetate, n-butanol, and methanol solvent.

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“…This indicates that the addition of CO 2 in the extraction system did not affect significantly on the chemical composition of the final products. As informed above that the addition of CO 2 to subcritical water extraction system can accelerate the rates of acid-catalyzed reactions due to the formation of carbonic acid [17][18][19][20][21][22][23][24]. Walsum and Shi [19] conducted experiments for carbonic acid and liquid hot water pretreatments to corn stover.…”

Section: Products Identificationmentioning

confidence: 99%

“…Benito-Roman et al [16] extracted glucan compounds from different cereals in a fixed-bed extractor, using subcritical water as a solvent, a temperature range of 110-175 o C and at a pressure of 20 bar. In order to enhance the hydrolysis rate, the properties of water at subcritical conditions were improved by adding carbon dioxide (CO 2 ) since it reacts to carbonic acid, which serves as a catalyst [17][18][19][20][21][22][23][24]. Hunter and Savage [17] demonstrated the feasibility of using CO 2 -water mixtures at 300 o C as an environmentally benign reaction medium for acid catalysis to form cyclohexene from cyclohexanol via dehydration reaction.…”

Section: Introductionmentioning

confidence: 99%

Enhancing pressurized water extraction of β-glucan from barley grain by adding CO2 under hydrothermal conditions

Kodama

Shoda

Machmudah

et al. 2015

Chemical Engineering and Processing: Process Intensification

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Subcritical water extraction is one of the green ways to isolate plants biomass components. In this work, it has been applied as a media to extract β-glucan from barley (Hordeum vulgare L.). The extractions were carried out at temperatures of 130-170 o C and a pressures of 10-40 MPa, using a semi-batch system. UV-vis spectra of liquid fraction products showed a high content of hemicelluloses, including glucan compounds. Results of FT-IR spectra analysis showed that β-glucan has been extracted from barley grains after subcritical water treatment. The elemental analysis showed that dehydration and decarboxylation occurred during subcritical water extraction of barley grains at these conditions. The gel permeation chromatography (GPC) analysis showed that the average molecular weight of water-soluble products were approximately 500 Da to 1167 kDa. To improve the extraction process, the CO 2 was added. At the same extraction time, the yield of β-glucan in the liquid fraction products increased clearly with the presence of CO 2 .

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Ginger and turmeric starches hydrolysis using subcritical water + CO2: the effect of the SFE pre-treatment

Cited by 42 publications

References 11 publications

Subcritical water hydrolysis of durian seeds waste for bioethanol production

Subcritical water hydrolysis of durian seeds waste for bioethanol production

Total Phenolic and Flavonoid Content, and Antioxidant Capacity of Red Ginger (Zingiber officinale var. Rubrum) Ethanolic Extract and Fraction

Enhancing pressurized water extraction of β-glucan from barley grain by adding CO2 under hydrothermal conditions

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