Biodiversitas Journal of Biological Diversity
Vol. 20 No. 9 (2019)

Phenotypic and genotypic characteristics of exopolysaccharide-producing fungi as a source of food additives

Robby Akroman (Graduate School of Biotechnology, Universitas Jember. Jl. Kalimantan No. 37, Jember 68121, East Java, Indonesia)
NURHAYATI NURHAYATI (Center for Development of Advanced Sciences and Technology, Universitas Jember. Jl. Kalimantan No. 37, Jember 68121, East Java, Indonesia)
SONY SUWASONO (Department of Agricultural Products Technology, Faculty of Agricultural Technology, Universitas Jember. Jl. Kalimantan No. 37, Jember 68121, East Java, Indonesia)
JAY JAYUS (Department of Agricultural Products Technology, Faculty of Agricultural Technology, Universitas Jember. Jl. Kalimantan No. 37, Jember 68121, East Java, Indonesia)



Article Info

Publish Date
12 Aug 2019

Abstract

Abstract. Akroman R, Nurhayati N, Suwasono S, Jayus J. 2019. Phenotypic and genotypic characteristics of exopolysaccharide-producing fungi as a source of food additives. Biodiversitas 20: 2468-2474. As the demand for materials suitable for edible film in food processing is increasing, the exploration of exopolysaccharide (EPS) producing fungi is important. Some fungi had been reported to produce extracellular polysaccharide having rheological properties potential as thickener and or plasticizer useful for edible film raw material. Therefore, this study was focused on isolation and identification of EPS-producing fungi from the plantation area surrounding the University of Jember, Indonesia. The fungal isolate obtained was morphologically identified based on mycelia and spore type, while its genotype was determined using ITS1 and ITS4 primers. The optimum initial culture pH for EPS production was measured using shake flask culture fermentation. The rheological properties of the EPS were determined using Brookfield viscometer, and surface structure of EPS was observed using a scanning electron microscope (SEM). The result showed that the mycelium of the isolate was reddish-brown and septated, its spores were formed as conidiospores. Internal Transcribed Spacer (ITS) sequence of the fungus showed that the isolate is a new species. Therefore, it was designated as C. lunata isolate RJ01. Optimum initial pH for EPS production was pH 6.0, achieved after 5 days fermentation yielded 2.6 g L-1 of EPS. The EPS from C. lunata isolate RJ01 have no cytotoxic activity on vero cell. The rheological behaviour of C. lunata EPS was viscous, and its surface structure of EPS was compact indicating its potency as thickening agent and plasticizer, a material required for edible film formation in food industries.

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Journal Info

Abbrev

biodiv

Publisher

Subject

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

Description

The Biodiversitas Journal was first published in 2000 by the Department of Biology, FMNS, Universitas Sebelas Maret, Surakarta, Indonesia, then in 2006 it was co-published by the Society for Indonesian Biodiversity and that department; since 2017 it was also hosted by Smujo. From 2003-2012 it was ...