Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado.Qualidade pós-colheita de colmos de cana armazenados e seus reflexos na produção de cachaça Post-harvest quality of stored sugarcane stalks and their reflection on the production of cane spirit ResumoEsta pesquisa teve como objetivos avaliar as características tecnológicas e microbiológicas do caldo de cana colhida e armazenada, assim como seus reflexos na condução dos processos fermentativos e formação dos compostos secundários e contaminantes da cachaça. Depois da colheita da cana-de-açúcar, os colmos foram armazenados à temperatura ambiente (20-32 °C) por períodos de 0, 24, 48, 72 e 96 horas, sendo o mosto preparado logo após a extração do caldo. As fermentações foram conduzidas em processo de batelada, por cinco ciclos fermentativos, com destilação dos vinhos em alambique de cobre. Foram analisadas as características tecnológicas e microbiológicas do caldo e do processo fermentativo. O armazenamento dos colmos de cana causou significantes perdas na qualidade tecnológica do caldo, influenciando negativamente o processo fermentativo, com decréscimo na viabilidade de células e brotos de leveduras. A utilização de matéria-prima armazenada por períodos superiores a 48 horas contribuiu para a redução do pH e aumento da acidez total e açúcares redutores residuais dos vinhos, refletindo em menor produção de álcool. Os níveis de acidez volátil, acetato de etila, acetaldeído, cobre, metanol e carbamato de etila das cachaças ficaram dentro do estabelecido pela Legislação Brasileira, enquanto o conteúdo de álcoois superiores e furfural apresentaram-se elevados nos destilados de cana colhida e armazenada. Palavras-chave: Matéria-prima; Armazenamento; Processos fermentativos; Composição química. SummaryThis research aimed to evaluate the technological and microbiological characteristics of the juice produced from harvested and stored sugarcane, and the reflections on the fermentative processes and formation of secondary compounds and contaminants in the production of cane spirit. After harvesting, the sugarcane stalks were stored at environmental temperature (20-32 °C) for 0, 24, 48, 72, and 96 hours, the must being prepared soon after juice extraction. The fermentations were carried out using a batch process with five fermentative cycles, distilling the wine in a copper still. The technological and microbiological characteristics of the juice and the fermentation process were analysed. Storage of the cane stalks caused significant losses in the technological quality of the juice, negatively influencing the fermentative process, and decreasing the viability of the yeast cells and shoots. The use of raw material stored for periods longer than 48 hours contributed to a reduction in pH, increase in total acidity and increase in residual reducing sugars in the wines, reflecting in reduced alcohol ...
This study aimed to evaluate the efficiency of natural biocides, brown and green propolis, for the control of bacterial contamination in the production of sugarcane spirit. The treatments consisted of brown and green propolis extracts, ampicillin, and a control and were assessed at the beginning and end of harvest season in ten fermentation cycles. In the microbiological analyses, the lactic acid bacteria were quantified in the inoculum before and after the treatment with biocides, and the viability of yeast cells during fermentation was evaluated. The levels of acids, glycerol, total residual reducing sugars, and ethanol were analyzed for the wine resulting from each fermentation cycle. A reduction in the number of bacterial contaminants in the inoculum in the treatments with the natural biocides was observed, but it did not affect the viability of yeast cells. The control of the contaminants led to the production of higher levels of ethanol and reduced acidity in the wine produced. The results of the use of brown and green propolis to control the growth microorganisms in the fermentation of sugarcane spirit can be of great importance for using alternative strategies to synthetic antibacterials in fermentation processes including other distilled beverage or spirits.
A minha maravilhosa esposa e aos meus amados filhos.Pelos sentimentos de amor verdadeiro.Pelo incondicional apoio e companheirismo.Pelos momentos de infinita alegria que sempre me proporcionam.Aos meus queridos pais.Pelo intenso amor e carinho.Pelos incentivos e ensinamentos transmitidos durante minha caminhada.Por me proporcionarem uma vida repleta de felicidades.Aos meus irmãos Carol e Gustavo, meu cunhado Widson e minha cunhada Lóren.Pelo carinho, amor e amizade.Pela união e apoio em todos os momentos de minha vida.A minha maravilhosa e querida afilhada Brunna.Pelos momentos de muito carinho.Pela oportunidade de tê-la como uma filha em meu coração.Aos meus queridos avós.Pelo infinito amor e carinho.Pelas sabedorias e ensinamentos. Ao Instituto Federal do Triângulo Mineiro (IFTM), campus Uberaba, pelas oportunidades de realização desta pesquisa; Aos amigos do IFTM, pela amizade e contribuições: Prof.
The addition of Cerrado fruits to juice and nectar formulations is an interesting alternative for the beverage industry, as it allows developing innovative products containing nutritive and bioactive compounds. Thus, the objective of this study was to produce mixed nectar of orange and uvaia, using orange nectar as a control, and to evaluate physicochemical and microbiological characteristics of beverages during the storage. Mixed nectar formulations were prepared with the addition of uvaia pulp and orange juice, while the orange nectar was made with fruit juice, and the addition of mineral water and commercial sucrose. Resulting nectar was bottled in sterilized glass bottles, immediately closed and heat-treated in a water bath at 90 °C for 5 minutes. Then, bottles containing the beverages were cooled and stored at room temperature for the physicochemical (Brix, pH, total acidity, ascorbic acid, reducing sugars, and phenolic compounds) and microbiological (total coliforms, molds and yeasts, and lactic acid bacteria) characterization. Total soluble solids and reducing sugars contents increased during storage for the mixed nectar formulations. Higher total acidity and lower pH levels were observed for the mixed nectar throughout the storage. Although, the mixed nectar exhibited higher ascorbic acid content, this parameter was significantly reduced during the storage. Concentration of phenolic compounds was higher for the mixed nectar, which increased with the addition of uvaia pulp to the formulation. Lactic acid bacteria counts remained at reduced levels for all formulations analyzed, while yeasts and total coliforms populations increased in the control formulation during the storage.
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