Yanyun Zhao

Aus den Schalen von Krebsen und Garnelen fallen Unmengen von Nebenprodukten an, die bei der industriellen Verarbeitung zu erheblichen Umweltverschmutzungen und Gesundheitsproblemen f hren, die jedoch in hochwertige, n tzliche Produkte wie Chitin und Chitosan umgewandelt werden. Zur Herstellung von Chitin und Chitosan im Rahmen einer gro angelegten submersen Fermentation wurde Krabbenschalenpulver (SSP) durch aufeinanderfolgende dreistufige Fermentation von Serratia marcescens B742, Lactobacillus plantarum ATCC 8014 und Rhizopus japonicus M193 fermentiert, um Chitin und Chitosan unter optimalen Bedingungen zu gewinnen. Au erdem wurden die Schl sselparameter untersucht, um die Ver nderungen der resultierenden Produkte w hrend des Fermentationsprozesses zu berwachen. Die Ergebnisse zeigten, dass die Ausbeute an hergestelltem Chitin und Chitosan 21,35 % bzw. 13,11 % betrug, wobei die R ckgewinnungsrate 74,67 % bzw. 63,42 % betrug. Die DDA und MM des hergestellten Chitosans betrugen 81,23 % bzw. 512,06 kDa. Die etablierte mikrobielle Fermentationsmethode kann f r die industrielle Produktion von Chitin und Chitosan im gro en Ma stab eingesetzt werden, wobei der Einsatz chemischer Reagenzien erheblich reduziert werden konnte.

Les carapaces de crustac s (crabes et crevettes) produisent des quantit s de sous-produits qui entra nent une grave pollution de l'environnement et des probl mes de sant humaine au cours de la transformation industrielle, mais elles sont transform es en produits utiles de grande valeur, tels que la chitine et le chitosane. Pour pr parer la chitine et le chitosane dans le cadre d'une fermentation submerg e grande chelle, les poudres de carapace de crevettes (SSP) ont t ferment es successivement en trois tapes par Serratia marcescens B742, Lactobacillus plantarum ATCC 8014 et Rhizopus japonicus M193 afin d'extraire la chitine et le chitosane dans des conditions optimales ant rieures. En outre, les param tres cl s ont t tudi s pour contr ler les changements des produits obtenus au cours du processus de fermentation. Les r sultats ont montr que le rendement de la chitine et du chitosane pr par s atteignait 21,35 % et 13,11 % avec un taux de r cup ration de 74,67 % et 63,42 %, respectivement. Le DDA et le MM du chitosane produit taient respectivement de 81,23% et 512,06 kDa. La m thode de fermentation microbienne tablie peut tre appliqu e la production industrielle grande chelle de chitine et de chitosane, tandis que l'utilisation de r actifs chimiques a t consid rablement r duite.

As cascas de crust ceos de caranguejos e camar es produzem quantidades de subprodutos, levando a uma grave polui o ambiental e a problemas de sa de humana durante o processamento industrial, mas transformam-se em produtos teis de elevado valor, como a quitina e o quitosano. Para preparar a quitina e o quitosano ao n vel da fermenta o submersa em grande escala, os p s de casca de camar o (SSPs) foram fermentados por fermenta o sucessiva em tr s fases de Serratia marcescens B742, Lactobacillus plantarum ATCC 8014 e Rhizopus japonicus M193 para extrair quitina e quitosano com base em condi es previamente optimizadas. Al m disso, os par metros-chave foram investigados para monitorizar as altera es dos produtos resultantes durante o processo de fermenta o. Os resultados mostraram que o rendimento da quitina e do quitosano preparados atingiu 21,35% e 13,11% com uma taxa de recupera o de 74,67% e 63,42%, respetivamente. A DDA e a MM do quitosano produzido foram de 81,23% e 512,06 kDa, respetivamente. O m todo de fermenta o microbiana estabelecido pode ser aplicado para a produ o industrial em grande escala de quitina e quitosano, enquanto a utiliza o de reagentes qu micos foi significativamente reduzida.

I gusci dei crostacei, granchi e gamberi, producono quantit di sottoprodotti che, durante la lavorazione industriale, causano gravi problemi di inquinamento ambientale e di salute umana, ma si trasformano in prodotti utili di alto valore, come la chitina e il chitosano. Per preparare chitina e chitosano a livello di fermentazione sommersa su larga scala, la polvere di guscio di gambero (SSP) stata fermentata mediante una successiva fermentazione in tre fasi di Serratia marcescens B742, Lactobacillus plantarum ATCC 8014 e Rhizopus japonicus M193 per estrarre chitina e chitosano sulla base di condizioni precedentemente ottimali. Inoltre, sono stati studiati i parametri chiave per monitorare i cambiamenti dei prodotti ottenuti durante il processo di fermentazione. I risultati hanno mostrato che la resa della chitina e del chitosano preparati ha raggiunto il 21,35% e il 13,11% con un tasso di recupero del 74,67% e del 63,42%, rispettivamente. La DDA e la MM del chitosano prodotto erano rispettivamente 81,23% e 512,06 kDa. Il metodo di fermentazione microbica stabilito pu essere applicato per la produzione industriale su larga scala di chitina e chitosano, riducendo significativamente l'uso di reagenti chimici.

This book builds an information platform on China's industrial competitiveness, providing scientific design and application case studies for integrated analysis and decision-making facilities and mechanisms for enterprises, industries, financial institutions and governments, which can make up for the lack of adequate information in China's market operations, especially the problems of duplicate construction and vicious competition aggravated by the lack of systematically processed industrial information. This book not only pursues innovation in technical methods and application theories but also pursues the collection, processing and collation of relevant domestic and international data and development and application so as to provide primary results for an industrial competitiveness database adapted to government management needs. The research is closely related to the actual problems in China and extensively uses statistical data to make various model analyses, which has a relativelysizeable academic value.

This book builds an information platform on China's industrial competitiveness, providing scientific design and application case studies for integrated analysis and decision-making facilities and mechanisms for enterprises, industries, financial institutions and governments, which can make up for the lack of adequate information in China's market operations, especially the problems of duplicate construction and vicious competition aggravated by the lack of systematically processed industrial information. This book not only pursues innovation in technical methods and application theories but also pursues the collection, processing and collation of relevant domestic and international data and development and application so as to provide primary results for an industrial competitiveness database adapted to government management needs. The research is closely related to the actual problems in China and extensively uses statistical data to make various model analyses, which has a relativelysizeable academic value.