Evaluation of the activity of natural phenolic antioxidants, extracted from industrial coffee residues, on the stability of poly(1,4‐butylene succinate) formulations

Abstract

In this work, the evaluation of the antioxidant activity of natural phenolic compounds is performed and compared to that of a conventional antioxidative agent. Phenolic molecules, extracted from industrial processing coffee residues, are added to a matrix of poly(1,4-butylene succinate) (PBS). The apparent activation energy (E a ) of the thermo-oxidative degradation is calculated by employing different methods like Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa and Friedman. The results are compared with the antioxidant activity evaluation obtained through the ABTS radical scavenging assay. From the average activation energies, it is observed that the addition of the natural antioxidants led to an increase in the activation energy of the degradation process as a function of the phenolic compound content. This trend is confirmed by the results of the ABTS assay. Hence, this study proves that the active molecules extracted from agri-food waste could be employed to improve the antioxidant capacity of the biopolymer, even if the composition of the extract must be evaluated in order to mitigate the effects of other components.

Valorization of coffee silverskin by cascade extraction of valuable biomolecules: preparation of eco‐friendly composites as the ultimate step

“…Moreover, T 5% values for the samples containing 5 wt% of residues are higher than those of the PBS reference. Similar behavior has already been reported in the literature and it is due to the presence of stabilizing components 58,60 …”

“…Similar behavior has already been reported in the literature and it is due to the presence of stabilizing components. 58,60 Furthermore, comparing the data of T 5% under nitrogen and air flow, reported in Fig. 11, a different composites' behavior can be deduced.…”

Unlocking energy potential: Investigating thermal degradation and kinetic modeling of health‐care waste polymers for enhanced pyrolysis conversion

“…It is noteworthy that all of the integral isoconversional methods, namely Friedman, Ozawa, FWO, and KAS, demonstrate a high level of reliability in calculating the kinetic parameters of the polymers evaluated in this study 16,63 . This conclusion is supported by the statistical analysis presented in Table 6.…”

“…the kinetic parameters of the polymers evaluated in this study. 16,63 This conclusion is supported by the statistical analysis presented in Table 6. Furthermore, the variation among the activation energy E a values obtained from these methods is not significant, being less than 3% (Table 6).…”

Comparative Study of Flax and Pineapple Leaf Fiber Reinforced Poly(butylene succinate): Effect of Fiber Content on Mechanical Properties

“…The material was supplied by PTT MCC Biochem Company Limited (Bangkok, Thailand) and had a density of 1.26 g/cm 3 and a melt index of 5 g/10 min (190 • C, 2.16 kg). Its reported molecular weight (M w ) was approximately 170 kDa [28].…”