Isolation and characterization of cellulose nanocrystals from pineapple crown waste and their potential uses

Prado, Karen S.; Spinacé, Márcia A. S.

doi:10.1016/j.ijbiomac.2018.10.187

Cited by 162 publications

(59 citation statements)

References 57 publications

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“…Native cellulose can be broken into micro- and nanocrystalline structures by the effect of strong acids or mechanical forces. Acid hydrolysis process of cellulose is used to breakdown the amorphous regions of cellulose, which enables the separation of nanocrystalline cellulose (NC) [31, 32, 33, 34, 35, 36]. NC cellulose is considered as a novel cellulosic material due to its excellent characteristics including biodegradability, nontoxicity, and renewability.…”

Section: Introductionmentioning

confidence: 99%

Comparison between gelatin/carboxymethyl cellulose and gelatin/carboxymethyl nanocellulose in tramadol drug loaded capsule

Kadry

2019

Heliyon

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The comparison between Tramadol drug loaded microspheres prepared from gelatin/sodium carboxymethyl cellulose (NaCMC) and those prepared from gelatin/sodium carboxymethyl nanocellulose (NaCMNC) in presence of glutaraldehyde (GA) as cross linker was carried out. Cellulose isolated from rice straw was hydrolyzed using 65% H 2 SO 4 to prepare nanoparticles with average particle size ranging from 44 to 66 nm. Various formulations of gelatin/NaCMC and gelatin/NACMNC were prepared with different ratios of amounts of gelatin, NaCMC/NaCMNC, and GA. Microspheres were characterized by fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy. The FTIR spectroscopy results confirmed the structure of microsphere and the absence of chemical interactions among Tramadol drug, polymer, and crosslinking agent. The ultraviolet spectroscopy showed 68% efficiency of the drug encapsulation using cellulose, while 55% for nanocellulose. The equilibrium water uptake decreased from 646 to 329% for cellulose microspheres, when the amount of GA increased from 5 to 10 mL. In contrast, the equilibrium water uptake decreased significantly from 501 to 33.7% for nanocellulose microspheres. The yield percentage enhanced from 54.67 to 80% for nanocellulose microspheres. The in vitro release rate was also calculated. The percent cumulative release of drug was significantly increased at the first 2 h and then a slow increase was further noticed. In general, the nanocellulose microsphere showed lower release rates than cellulose. None of the prepared microsphere presented 100% drug release until 12 h.

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Section: Introductionmentioning

confidence: 99%

Comparison between gelatin/carboxymethyl cellulose and gelatin/carboxymethyl nanocellulose in tramadol drug loaded capsule

Kadry

2019

Heliyon

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“…By evaluating the results obtained in Table 1 for consistency index, it is possible to identify a reduction in the workability of the mortars with the incorporation of the fibers, although this decrease is not very pronounced (around 4%). Mortars containing treated fibers showed greater workability than those with natural fibers, which can be attributed to the greater water absorption of natural fibers, which did not undergo NaOH treatment to become less hygroscopic (Prado & Spinacé, 2019). In the fresh state, this affects the free water present in the mortar structure, which instead of Table 1.…”

Section: Resultsmentioning

confidence: 99%

Development of mortar for laying and coating with pineapple fibers

Azevedo

Marvila

Zanelato

et al. 2020

Rev. bras. eng. agríc. ambient.

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Brazil is one of the largest producers of pineapple in the world, which, in addition to bringing substantial benefits, contributes to increasing waste generation in the stages of processing, aiming at its consumption. The Brazilian environmental legislation has been increasingly more restrictive with respect to the disposal of solid waste, whether domestic, industrial or agro-industrial, which has stimulated studies related to the use of these materials in several matrices. This study aimed to evaluate the potentiality of using the natural fiber of pineapple (Ananas comosus), extracted from its leaves, as reinforcing material in cementitious composites. For this purpose, natural fiber extracted from the pineapple crown was incorporated in different percentages in relation to the cement mass: 0, 2.5, 5, 7.5 and 10%, and the fibers obtained were submerged in aqueous NaOH solution with 5% concentration in volume, for 1 h at room temperature. The following variables were evaluated: consistency, water retention, incorporated air, mass density in hardened state, mechanical strength, water absorption by immersion and capillarity, besides verifying the influence of the mode of fiber incorporation. It was observed that the treatment with NaOH solution and the percentage of natural pineapple fiber incorporated in up to 5% in relation to the cement mass form mortars with technological feasibility.

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“…The fibre was dried in oven at 70°C for 24 h to prevent fungal growth and contamination. Samples were stored in sealed plastic bags at room temperature until further use (Prado & Spinacé, 2019).…”

Section: Methodsmentioning

confidence: 99%

Effect of Steam and Bleaching Treatment on the Characteristics of Pineapple Leaves Fibre Derived Cellulose

Gnanasekaran¹,

Muslih²,

Shariffuddin³

et al. 2020

JST

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Pineapple leaf fibres (PALF) is one of the abundant residues generated from pineapple plantation. The residues are left on the plantation for nutrient cycling or burning, and this circumstance leads to environmental issues. PALF has high cellulose content among other natural fibres. Cellulose is a reinforcing element that exists as whisker-like microfibrils and has a long-chain structure. In this study, cellulose produced from PALF was treated by steam and chemical treatment. The fibre was treated with steam at 121°C, a pressure of 21 psi for 30 or 60 min. Next, the steam-treated fibre was treated with 5 wt% sodium chlorite (NaClO2) solution with pH adjusted between 4 and 5 for 90 min. The condition was varied with three different temperatures, which were room temperature, 50, and 70°C. Then, the bleached fibre was treated with 5 wt% sodium hydroxide (NaOH) at room temperature for 3 h. After the treatments, the fibre was analysed for its thermal stability, morphology, and chemical composition. Cellulose obtained from the treatment condition of steam for 60 min, bleaching at 70°C, and alkali treatment at room temperature expressed the highest degradation temperature of 276°C at 20% weight loss, percentage of cellulose of 86% and lowest moisture content (8%) compared to others sample. It also had an excellent surface morphology with finest fibril disintegration. It showed longer steam treatment (60 min) degrading more hemicellulose; and bleaching treatment at high temperature (70°C), increasing the rate of oxidative delignification. In conclusion, the suggested treatment provides a simple but efficient method to isolate cellulose that can be used for various types of applications.

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Isolation and characterization of cellulose nanocrystals from pineapple crown waste and their potential uses

Cited by 162 publications

References 57 publications

Comparison between gelatin/carboxymethyl cellulose and gelatin/carboxymethyl nanocellulose in tramadol drug loaded capsule

Comparison between gelatin/carboxymethyl cellulose and gelatin/carboxymethyl nanocellulose in tramadol drug loaded capsule

Development of mortar for laying and coating with pineapple fibers

Effect of Steam and Bleaching Treatment on the Characteristics of Pineapple Leaves Fibre Derived Cellulose

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