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Desenvolvimento de um novo material de embalagem alimentar: laminados de filme de proteĆna de soro do leite e papel
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| Documento em Acesso Embargado atĆ© dia 11-06-2028. Tente solicitar cĆ³pia ao autor carregando no ficheiro | 2.03 MB | Adobe PDF |
Authors
Abstract(s)
Os plĆ”sticos estĆ£o presentes na sociedade sob a forma de diversos objetos indispensĆ”veis Ć rotina humana. No entanto, estes materiais tĆŖm vindo a causar inĆŗmeras consequĆŖncias negativas para o meio ambiente e para a saĆŗde pĆŗblica. A problemĆ”tica associada a este tipo de resĆduo consiste no facto de nĆ£o serem biodegradĆ”veis, apresentarem um elevado nĆvel de toxicidade e atuarem como vetores de diversos compostos quĆmicos nocivos e microrganismos patogĆ©nicos. Ć relevante destacar que uma parte significativa dos resĆduos plĆ”sticos encontrados no meio ambiente sĆ£o provenientes da indĆŗstria de embalagens alimentares.
Neste contexto, tem-se investigado intensamente acerca da substituiĆ§Ć£o de polĆmeros provenientes de combustĆveis fĆ³sseis por biopolĆmeros, os quais incluem polissacĆ”ridos, proteĆnas e lĆpidos. Nesta lĆ³gica, o presente trabalho teve como objetivo desenvolver um novo material de embalagem a partir de laminados constituĆdos por filme Ć base de proteĆna de soro do leite e papel, apresentando uma alternativa viĆ”vel para a utilizaĆ§Ć£o das proteĆnas de soro do leite que sĆ£o descartadas pela indĆŗstria de lacticĆnios. Os filmes foram produzidos atravĆ©s do mĆ©todo de evaporaĆ§Ć£o de solvente, enquanto os laminados foram obtidos por calandragem, envolvendo processos mecĆ¢nicos e quĆmicos. As amostras foram caracterizadas por microscopia eletrĆ³nica de varrimento (SEM), calorimetria diferencial de varrimento (DSC) e espectroscopia de infravermelho por transformada de Fourier (FTIR). Adicionalmente, foram avaliadas as propriedades antioxidantes dos materiais atravĆ©s do ensaio de branqueamento do Ī²-caroteno. Os laminados demonstraram propriedades mecĆ¢nicas superiores em comparaĆ§Ć£o com o filme isolado, bem como elevada atividade antioxidante. Verificou-se ainda que os polĆmeros apresentaram degradaĆ§Ć£o tĆ©rmica na faixa dos 250 Ā°C. O protĆ³tipo de embalagem desenvolvido revelou-se termoselĆ”vel e com elevado potencial na prevenĆ§Ć£o da peroxidaĆ§Ć£o lipĆdica de nozes. Concluiu-se que o protĆ³tipo de embalagem desenvolvido a partir de polĆmeros biodegradĆ”veis, representa uma alternativa promissora Ć substituiĆ§Ć£o do plĆ”stico convencional, com propriedades funcionais adequadas para a conservaĆ§Ć£o, em especial, de alimentos secos e com elevado teor lipĆdico.
Plastics are present in society in the form of several objects that are indispensable to human routine. However, these materials have been causing numerous negative consequences for the environment and public health. The problem associated with this type of waste lies in the fact that it is not biodegradable, has a high level of toxicity and acts as a vector for various harmful chemical compounds and pathogenic microorganisms. It is important to note that a significant proportion of the plastic waste found in the environment comes from the food packaging industry. In this context, intensive research has been conducted on the replacement of polymers derived from fossil fuels with biopolymers, which include polysaccharides, proteins and lipids. Following this logic, the present study aimed to develop a new packaging material as laminates consisting of whey protein-based film and paper, presenting a viable alternative for the use of whey proteins that are discarded by the dairy industry. The films were produced using the casting method, while the laminates were obtained by calendering molding technique, involving mechanical and chemical processes. The samples were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). In addition, the antioxidant properties of the materials were evaluated by the Ī²-carotene bleaching test. The laminates demonstrated better mechanical properties compared to the isolated film, as well as high antioxidant activity. It was also found that the polymers showed thermal degradation in the range of 250 Ā°C. The packaging prototype developed proved to be heat sealable and with high potential for preventing lipid peroxidation. It is concluded that the packaging prototype developed from biodegradable polymers represents a promising alternative to conventional plastic, with functional properties suitable for the preservation of dry foods with high lipid content.
Plastics are present in society in the form of several objects that are indispensable to human routine. However, these materials have been causing numerous negative consequences for the environment and public health. The problem associated with this type of waste lies in the fact that it is not biodegradable, has a high level of toxicity and acts as a vector for various harmful chemical compounds and pathogenic microorganisms. It is important to note that a significant proportion of the plastic waste found in the environment comes from the food packaging industry. In this context, intensive research has been conducted on the replacement of polymers derived from fossil fuels with biopolymers, which include polysaccharides, proteins and lipids. Following this logic, the present study aimed to develop a new packaging material as laminates consisting of whey protein-based film and paper, presenting a viable alternative for the use of whey proteins that are discarded by the dairy industry. The films were produced using the casting method, while the laminates were obtained by calendering molding technique, involving mechanical and chemical processes. The samples were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). In addition, the antioxidant properties of the materials were evaluated by the Ī²-carotene bleaching test. The laminates demonstrated better mechanical properties compared to the isolated film, as well as high antioxidant activity. It was also found that the polymers showed thermal degradation in the range of 250 Ā°C. The packaging prototype developed proved to be heat sealable and with high potential for preventing lipid peroxidation. It is concluded that the packaging prototype developed from biodegradable polymers represents a promising alternative to conventional plastic, with functional properties suitable for the preservation of dry foods with high lipid content.
Description
Keywords
ProteĆna de Soro do Leite BiopolĆmero Filme Laminado Embalagem Alimentar Economia Circular Atividade Antioxidante Whey Protein Circular Economy Antioxidant Activity