Pradinunt Eiamsa-ard. Isolation and Identification of polyhydroxyalkanoate (PHA) producing bacteria from food industrial wastewater by using fluorometric screening. (). King Mongkut's University of Technology North Bangkok. Central Library. : , 2017.
Isolation and Identification of polyhydroxyalkanoate (PHA) producing bacteria from food industrial wastewater by using fluorometric screening
Abstract:
The sixteen polyhydroxyalkanoate (PHA) producing bacteria were isolated from industrial wastewater using Nile blue A fluorescence staining technique. The derived PHA-producing strains were identified through the 16S rDNA sequencing analysis and even phylogenetic evaluation. The results revealed that they were belonging to the five bacterial genera including Bacillus, Enterobacter, Klebsiella, Asaia, and Herbaspirillum. Moreover, the genetically identification profile of the two isolates OST-B2 and OST-RA9 were subsequently related to the strain Asaia bogorensis and Herbaspirillum huttiense which has not been proposed as the non-PHA accumulation strains before; hence, they might be classified as the novel PHA producing isolates. Additionally, the intracellular PHA concentration was determined after 24, 48, and 72 h cultivation through the spectrofluorometric technique. As follow, the PHA accumulation profile of OST-RA9 was slightly increased according to the extended cultivation time and maximize production at 72 h cultivation while another bacterial isolates gave the highest PHA production at reach 48 h. Thus, the isolated OST-RA9 could be considered as the attractive PHA producing strain through the highest PHA existence along with its identification appearance. Moreover, the distribution of intracellular PHA granules was subsequently explored in the isolate OST-RA9 according to the electron micrograph observation. Hence, the result would be exhibited a considerable activation of PHA production in different sources through the providing of the most appropriate and inexpensive precursor as well as strain improvement to further maximize the PHA yield.