ISOLATION AND CHARACTERIZATION OF POLYHYDROXYALKANOATE (PHA)-PRODUCING, CELLULOLYTIC BACTERIA FROM MUNICIPAL WASTEWATER

ERNIE EILEEN  RIZLAN ROSS; ISHAK ZUBIR; WAN RAZARINAH  WAN ABDUL RAZAK; FARIDA ZURAINA  MOHD YUSOF

doi:10.55230/mabjournal.v51i3.2186

Authors

ERNIE EILEEN RIZLAN ROSS
ernie974@uitm.edu.my
Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
ISHAK ZUBIR Malaysia Cocoa Board, Cocoa Innovative and Technology Centre, Lot 12621, Kawasan Perindustrian Nilai 71800 Nilai, Negeri Sembilan, Malaysia
WAN RAZARINAH WAN ABDUL RAZAK Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
FARIDA ZURAINA MOHD YUSOF Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia; Integrative Pharmacogenomics Institute (iPROMISE), FF3 Building, UiTM Selangor Branch, 42300 Puncak Alam Campus

Keywords:

Polyhydroxyalkanoate, bacteria, wastewater, cellulolytic

Abstract

Polyhydroxyalkanoates (PHA) are linear bio-esters produce in nature by certain microorganisms particularly when subjected to limited nutrients sources such as nitrogen while carbon sources are at abundance. PHA has attracted tremendous amount of attention from scientists globally due to their biodegradable property as environment-friendly alternative to petrochemical based plastics. However, the biggest drawback in using PHA is their high production cost. The aims of this study are to assess and characterise PHA-producing bacteria from municipal wastewater and compare their efficiencies in PHA production. A total of 34 out of 282 bacterial isolates from wastewater showed the ability to produce PHA using Sudan Black B staining. These isolates were then subjected to cellulase activity screen using carboxymethyl cellulose (CMC) agar. Two out of the 34 isolates were showed promising cellulose degrading capability and the cellulolytic activities were studied at 24, 48 and 72 hours of incubation respectively. The PHA production efficiencies of both isolates UiTM-E1 and UiTM-E2 were then compared using mineral salt media (MSM) supplemented with 1% and 2% glucose at 24, 48 and 72 hours of incubations respectively. Isolate UiTM-E2 showed the highest PHA production at 36.93% of its cell-dry weight (CDW) at 48 hours incubation.

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