Resumo

ORJUELA-PALACIO, Juliana M.  e  ZARITZKY, Noemí E.. Keratin Sponges with Hydrocarbon Sorbent Capacity, Obtained from Poultry Industry Waste. Cienc. Tecnol. Agropecuaria [online]. 2023, vol.24, n.1, e2830.  Epub 30-Abr-2023. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol24_num1_art:2830.

Chicken feathers are residues from the poultry industry that are difficult to break down; they are mainly constituted by keratin, a fibrous protein rich in cysteine, disulfide bonds and hydrophobic residues. This residue can be revalued to generate sorbent materials to control oil spills that cause environmental damage. The aim is to generate keratin sponges from feathers applicable to control of oil spills that represent important environmental damage. Two methodologies for sponge synthesis were used starting from treated feathers: E1: Urea (2M), Sodium sulfite (0.125M), Sodium dodecyl sulfate (0.05M), pH= 9, 90ºC, 30 min; E2: Urea (7.75M), Sodium sulfite (0.48M), pH= 6.5, 65°C, 120 min. The solutions were dialyzed and lyophilized to achieve self-assembly by spontaneous crosslinking of keratin. In the structural characterization (FTIR-ATR) the bands of Amide A (3330 cmˉ¹), Amide-I (1616 cm-1), Amide-II (1580-1510 cm-1), Amide-III (1240 -1230 cm-1) were observed. The secondary structure was analyzed by Amide-I deconvolution; the sheet-folded-β/α-helix/β-turn conformation for E1 was 55.1/19.6/25.3% and 52.1/36.7/10.5% for E2. Differential Scanning Calorimetry showed high thermal stability with denaturation peaks at 143.5 ºC (E1) and 215 °C (E2). The sorption isotherm was fitted with the GAB equation. The sorption capacity (CSC g crude/g keratin) and retention (%´CRC) of crude oil were determined. E2 presented better values of CAC (21.22) and CRC (78 %) than E1, (CAC= 5.87, CRC= 47%). It was possible to synthesize keratin sponges with characteristics of crude oil sorbents, being an option for biomass revaluation, its application could be extended to the control of other contaminants.

Palavras-chave : Chicken feathers; Differential scanning calorimetry; Oil spills; Proteins; Sorbent materials.

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