THE USE OF POLYSACCHARIDES EXTRACTED FROM SEED OF Persea americana var. Hass ON THE SYNTHESIS OF ACRYLIC HYDROGELS

Abstract

This paper reports the use of polysaccharides extracted from seed of Persea americana var. Hass in the synthesis of acrylic hydrogels. The effects of the chemical composition (acrylamide/acrylic acid), the concentration of crosslinking agent (glycerol diacrylate) and the type of initiation (redox, photoinitiation) of the hydrogels were evaluated with and without polysaccharides. Xerogels were characterized by FTIR spectroscopy, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), while for the swollen hydrogels the swelling kinetic and mechanical properties were evaluated. The kinetic parameters were obtained using the second order equation proposed by Schott, where it is reported that by increasing the concentration of the crosslinking agent, the degree of swelling is reduced because of the greater structural level. The increase of the amount of acrylamide and the amount of polysaccharides causes also a decrease in the swelling degree. The type of initiation also affected the hydrogels swelling kinetic, the photoinitiated hydrogels were the ones that captured less water. Moreover, the increasing of the glass transition temperature and the compression modulus with the crosslinking agent concentration and molar ratio AAm/AAc are observed for hydrogels with and without polysaccharides. The results demonstrate a successful incorporation of polysaccharides into the polymeric network.

Extraction of starch from Hass avocado seeds for the preparation of biofilms

“…The obtained by-products from the avocado are the peel and the seed, which are often discarded. This waste is approximately 15% of total weight and is commonly discarded or used as a compost (Lara-Valencia et al, 2018). Both, the avocado peel, and seed have-high value compounds that can be extracted and used in various industries, which would lead to full exploitation of the fruit (Wang et al, 2010).…”

“…The seed is a source of non-conventional starch, and its characteristics are similar to those of corn starch. Seed starch functional and rheological properties suggest that it could have several potential applications as an ingredient in food systems and other industrial processes (Chel-Guerrero et al, 2016;Lara-Valencia et al, 2018). The aim of this study was to extract starch from the seed of Persea americana Mill for biofilms production adding commercial value to such waste and reduce its environmental impact.…”

Development of Flame Retardant Property on Sodium Silicate Treated Paper Based Materials

“…However, ν Si-O-C at 1,000 -1,100 cm -1 was not clearly identified. It might cause by the overlapping of ν polysaccharide of cellulose [7][8]. Moreover, intensity of ν O-H of treated sample was decreased according to weaker signal at 3,333 -3,365 cm -1 .…”

“…The functional group of chemical composition in cellulose-based paper with and without treatment was shown in figure 2. Polysaccharide peaks were observed at 1,020 and 1,080 cm -1 for ν CH2-OH and v CH-OH which represent the unit of cellulose and hydroxyl group [7]. Treated cellulose-based papers were identified νsym Si-O-Si peak at 792 cm -1 which suggests a formation of silicate network.…”

Evaluation of Efficiency of Avocado Seed Powder (Persea Americana) as a Corrosion Inhibitor in Sae 1008 Carbon Steel in Acidic Medium / Avaliação Da Eficiência Da Semente De Abacate Em Pó (Persea Americana) Como Inibidor De Corrosão Em Aço Carbono Sae 1008 Em Meio Ácido

“…The peak centered at 3279 cm -1 can be attributed to O-H and also N-H groups, which can be found in water or amines 9,18 . The peak at 2921 cm -1 can be associated to C-H stretching present in organic compounds.…”