Aqueous extraction of pectin from sisal waste

Santos, José Amâncio Macedo; Espeleta, Alexandre F.; Branco, Alexsandro; Assis, Sandra Aparecida de

doi:10.1016/j.carbpol.2012.11.089

Cited by 98 publications

(48 citation statements)

References 20 publications

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“…The four peaks at 1161 (C-O-C asymmetric valence vibration), 1054 (C-O valence vibration), 993 (C-C, C-OH, C-H ring and side group vibrations) and 1112 cm -1 can be mainly attributed to cellulose and hemicellulose absorption [25, 35–37]. Negative loading from PC1 showed two main bands at 1598 cm -1 and 1412 cm -1 that can be assigned to the asymmetric and symmetric vibrations, respectively, of the COO (carboxylate) structure of esterified pectin [38]. Overall these results suggest that ATR FTIR is an effective tool for discriminating primary and secondary fibers based on the differential chemical composition of their cell walls.…”

Section: Resultsmentioning

confidence: 99%

Changes in hemp secondary fiber production related to technical fiber variability revealed by light microscopy and attenuated total reflectance Fourier transform infrared spectroscopy

et al. 2017

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Interest in hemp (Cannabis sativa L.) is increasing due to the development of a new range of industrial applications based on bast fibers. However the variability of bast fiber yield and quality represents an important barrier to further exploitation. Primary and secondary fiber content was examined in two commercial hemp varieties (Fedora 17, Santhica 27) grown under contrasted sowing density and irrigation conditions. Both growing conditions and hemp varieties impact stem tissue architecture with a large effect on the proportion of secondary fibers but not primary fibers. Attenuated total reflectance infrared spectroscopy allowed the discrimination of manually-isolated native primary fibers and secondary fibers but did not reveal any clustering according to growing conditions and variety. Infrared data were confirmed by wet chemistry analyses that revealed slight but significant differences between primary and secondary fiber cell wall composition. Infrared spectroscopy of technical fibers obtained after mechanical defibering revealed differences with native primary, but not secondary fibers and also discriminated samples obtained from plants grown under different conditions. Altogether the results suggested that the observed variability of hemp technical fibers could be partially explained by i) differences in secondary fiber production and ii) differential behavior during mechanical defibering resulting in unequal separation of primary and secondary fibers.

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Section: Resultsmentioning

confidence: 99%

Changes in hemp secondary fiber production related to technical fiber variability revealed by light microscopy and attenuated total reflectance Fourier transform infrared spectroscopy

et al. 2017

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“…These data may imply that the precipitate is composed mainly of pectin ( 1 ) in comparison with data from the commercial pectin [27]. …”

Section: Resultsmentioning

confidence: 99%

Chemicals from Agave sisalana Biomass: Isolation and Identification

Santos

Vieira

Braz-Filho

et al. 2015

IJMS

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Agave sisalana (sisal) is known worldwide as a source of hard fibers, and Brazil is the largest producer of sisal. Nonetheless, the process of removing the fibers of the sisal leaf generates 95% waste. In this study, we applied chemical sequential steps (hydrothermal extraction, precipitation, liquid-liquid extraction, crystallization, SiO2 and Sephadex LH 20 column chromatography) to obtain pectin, mannitol, succinic acid, kaempferol and a mixture of saponins as raw chemicals from sisal biomass. The structural identification of these compounds was performed though spectrometric methods, such as Infrared (IR), Ultraviolet (UV), Mass spectrometry (MS) and Nuclear magnetic resonance (NMR). All the sisal chemicals found in this work are used by both the chemical and pharmaceutical industries as excipients or active principles in products.

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“…The degree of esterification (DE) of pectin samples was determined by titrimetric method according to Santos et al () with some modifications. The dried sample (0.1 g) was transferred to a 250 ml flask, wetted with 3 ml of ethanol and dissolved in 40 ml of carbon dioxide‐free water.…”

Section: Methodsmentioning

confidence: 99%

“…Pectins are complex heteropolysaccharides, consisting of α‐1, 4‐linked d ‐galacturonic acid units and interrupted by l ‐rhamnose residues with side chains of neutral sugars, mainly l ‐rhamnose, l ‐arabinose, and d ‐galactose. The galacturonic acid residues may be partially methyl‐esterified at the C‐6 carboxyl group and sometimes O‐acetylated at C‐2 or C‐3 (Santos, Espeleta, Branco, & De Assis, ). Commercial pectin has particular specifications including more than 65% galacturonic acid with a degree of esterification higher than 50%.…”

Section: Introductionmentioning

confidence: 99%

The potential of ohmic heating for pectin extraction from orange waste

Saberian

Hamidi‐Esfahani

Gavlighi

et al. 2017

J Food Process Preserv

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The effect of voltage gradient, pH and S/L ratio during ohmic heating up to 90 °C on the heating rate, system performance coefficients (SPCs), yield, and quality of pectin was investigated. The results showed that the rate of heating was increased with increasing of voltage gradient (from 5 to 30 V/cm) and decreased with decreasing of pH (from 4 to 1.5). With increasing of voltage gradient and decreasing of pH and S/L ratio, SPC was increased and the highest SPC was 84.4%. The yield of pectin was increased sharply from 1.17 to 10.69 g/100 g d.m. by decreasing of pH from 4 to 1.5. Finally, the highest SPC and yield of pectin with good quality (high DE and galacturonic acid) were obtained at the voltage gradient of 30 V/cm, pH of 1.5 and S/L ratio of 1:20 g/ml. Practical applications Ohmic heating technology has a good potential to extract some components from plant waste because it heats the material rapidly with high energy efficiency (SPC) in comparison to the conventional heating, therefore it can be an appropriate alternative method for extraction of pectin industrially. In addition to obtaining the highest pectin with good quality, determination of ohmic heating rate (or time of heating) and SPC at different conditions is necessary to design the industrial ohmic extraction.

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Aqueous extraction of pectin from sisal waste

Cited by 98 publications

References 20 publications

Changes in hemp secondary fiber production related to technical fiber variability revealed by light microscopy and attenuated total reflectance Fourier transform infrared spectroscopy

Changes in hemp secondary fiber production related to technical fiber variability revealed by light microscopy and attenuated total reflectance Fourier transform infrared spectroscopy

Chemicals from Agave sisalana Biomass: Isolation and Identification

The potential of ohmic heating for pectin extraction from orange waste

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