Angewandte Chemie<\/a>, pode melhorar a seguran\u00e7a alimentar, reduzir o custo de processamento de aves e outros alimentos e ajudar a limitar amplos recalls a lotes que foram especificamente identificados como contaminados.<\/p>\nDe acordo com o estudo conduzido pela Universidade McMaster, em Hamilton, no Canad\u00e1, o teste fornece resultados precisos em uma hora ou menos, sem a necessidade de acess\u00f3rios ou fonte de energia, em compara\u00e7\u00e3o com o monitoramento atual por meio de culturas de laborat\u00f3rio, que exigem pelo menos um dia para produzir resultados.<\/p>\n
\u201cQualquer um pode us\u00e1-lo no ambiente onde os alimentos est\u00e3o sendo preparados, processados ou vendidos\u201d, diz o coautor do estudo Yingfu Li, professor de Bioqu\u00edmica e Biologia Qu\u00edmica que lidera o Grupo de Pesquisa de \u00c1cidos Nucleicos Funcionais de McMaster, em comunicado. \u201cH\u00e1 um equil\u00edbrio entre custo, conveni\u00eancia e necessidade. Se \u00e9 barato, confi\u00e1vel e f\u00e1cil, por que n\u00e3o us\u00e1-lo?\u201d<\/p>\n
A infec\u00e7\u00e3o por\u00a0Salmonella\u00a0acontece pela ingest\u00e3o de alimentos crus ou mal cozidos contaminados com fezes de animais com a presen\u00e7a da bact\u00e9ria. A Salmonella causa intoxica\u00e7\u00e3o alimentar e, em casos raros, pode provocar infec\u00e7\u00f5es graves e levar \u00e0 morte.<\/p>\n
Proteger o p\u00fablico da Salmonella \u00e9 uma alta prioridade para produtores de alimentos, varejistas e reguladores, j\u00e1 que a bact\u00e9ria \u00e9 uma das formas mais comuns e graves de infec\u00e7\u00e3o de origem alimentar, causando 155 mil mortes em todo o mundo todos os anos.<\/p>\n
O que faz o teste funcionar \u00e9 uma nova mol\u00e9cula sint\u00e9tica de \u00e1cido nucleico, desenvolvida na universidade. Para o teste, a mol\u00e9cula \u00e9 colocada entre part\u00edculas microsc\u00f3picas como o ouro.<\/p>\n
A plataforma de teste reveste o interior da ponta de uma pipeta e come\u00e7a a funcionar quando uma amostra liquefeita do alimento que est\u00e1 sendo testado \u00e9 retirada para dentro do tubo. Se a bact\u00e9ria Salmonella estiver presente, ela corta as part\u00edculas, permitindo que a mol\u00e9cula escape.<\/p>\n
Quando a solu\u00e7\u00e3o \u00e9 jogada em uma tira de teste de papel, a presen\u00e7a de Salmonella aparece como um tom vis\u00edvel de vermelho, gra\u00e7as a uma nova forma de biossensor, tamb\u00e9m criada pela equipe. Quanto maior a concentra\u00e7\u00e3o de Salmonella, mais brilhante a cor aparece.<\/p>\n
\u201cUsar esses testes \u00e9 mais f\u00e1cil do que usar um teste Covid, que tantas pessoas j\u00e1 est\u00e3o fazendo\u201d, diz o coautor Carlos Filipe, presidente do Departamento de Engenharia Qu\u00edmica da McMaster. \u201cPara que seja o mais eficaz e \u00fatil poss\u00edvel, deve ser f\u00e1cil de usar.\u201d<\/p>\n
A nova tecnologia foi desenvolvida com o apoio da organiza\u00e7\u00e3o de pesquisa sem fins lucrativos Mitacs e da Toyota Tsusho Canada Inc., uma subsidi\u00e1ria indireta da Toyota Tsusho Corporation no Jap\u00e3o, que planeja desenvolver a inova\u00e7\u00e3o para uso comercial.<\/p>\n
Uma vez ampliado e disponibilizado comercialmente, o novo teste pode ser um benef\u00edcio significativo para os processadores de aves, para quem a Salmonella est\u00e1 entre os riscos de contamina\u00e7\u00e3o mais significativos. O teste tamb\u00e9m seria ben\u00e9fico para garantir o processamento seguro de outros alimentos particularmente vulner\u00e1veis \u00e0 Salmonella, como ovos, latic\u00ednios e carne mo\u00edda. (Com CNN Brasil)<\/p>\n
*Foto: Artur Plawgo<\/p>\n","protected":false},"excerpt":{"rendered":"
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