Related Experiment Video

Updated: Jun 2, 2026

Sieving Fruit Pulp to Detect Immature Tephritid Fruit Flies in the Field
04:21

Sieving Fruit Pulp to Detect Immature Tephritid Fruit Flies in the Field

Published on: July 28, 2023

Enumeration of fungi in fruits by the most probable number method

Maiko Watanabe1, Fumiyuki Tsutsumi, Ken-ichi Lee

  • 1Div. of Microbiology, Natl. Inst. of Health Sciences, 1-18-1 Kamiyoga, Tokyo 158-8501, Japan.

Journal of Food Science
|May 4, 2011
PubMed

Insights

The plate-most probable number (MPN) method offers a faster and more accurate way to count fungi in fruits compared to traditional methods. This method shows good agreement with standard techniques while reducing enumeration time.

Area of Science:

  • Food microbiology
  • Mycology
  • Agricultural science

Background:

  • Fungal contamination is a significant cause of spoilage in fruits.
  • Accurate enumeration of fungi is crucial for food safety and quality assessment.
  • Traditional methods for fungal enumeration in foods can be time-consuming and less efficient.

Purpose of the Study:

  • To evaluate and compare different enumeration methods for fungi in fruit samples.
  • To assess the efficiency and accuracy of the plate-most probable number (MPN) method against traditional techniques.
  • To determine the optimal method for rapid and reliable fungal quantification in food.

Main Methods:

  • Evaluation of three fungal enumeration methods: standard MPN (liquid medium), plate-MPN (agar medium), and surface plating.
  • Testing of 27 samples from 9 commercial domestic fruit varieties, focusing on surface skin.
  • Incubation time points assessed included the 4th and 10th days for comparison.

Main Results:

  • The standard MPN method exhibited slower fungal recovery and lower counts compared to surface plating and plate-MPN.
  • No significant difference was observed in fungal counts between the surface plating method and the plate-MPN method at different incubation times (4th vs. 10th day).
  • The plate-MPN method demonstrated good agreement with the traditional enumeration method.

Conclusions:

  • The plate-MPN method is a comparatively superior and rapid technique for enumerating fungi in fruits.
  • This method offers advantages in terms of speed and accuracy over the standard MPN method.
  • The plate-MPN method provides reliable fungal counts comparable to traditional methods, making it suitable for food analysis.

More Related Videos

Quantification of Fungal Colonization, Sporogenesis, and Production of Mycotoxins Using Kernel Bioassays10:01

Quantification of Fungal Colonization, Sporogenesis, and Production of Mycotoxins Using Kernel Bioassays

Published on: April 23, 2012

Isolation of Culturable Yeasts and Molds from Soils to Investigate Fungal Population Structure10:33

Isolation of Culturable Yeasts and Molds from Soils to Investigate Fungal Population Structure

Published on: May 27, 2022

Related Concept Videos

Fungal Phylum Basidiomycota01:26

Fungal Phylum Basidiomycota

Basidiomycota is a diverse phylum of fungi that includes ecologically significant decomposers such as white rot fungi, symbionts like mycorrhizal fungi, plant pathogens such as rusts and smuts, and edible species like Agaricus bisporus (the common button mushroom). These fungi play crucial roles in nutrient cycling, symbiotic relationships, and even human health. Their defining feature is the basidium, a microscopic club-shaped structure responsible for producing basidiospores.Fruiting Bodies...
Fungal Group Zygomycota01:29

Fungal Group Zygomycota

Zygomycota, previously classified as a distinct fungal group, are primarily terrestrial, saprophytic molds that play a crucial role as decomposers. Recent phylogenetic studies have revealed that these fungi are now divided into two major clades — Mucoromycota, which includes many symbiotic species, and Zoopagomycota, which primarily consists of parasitic and pathogenic fungi. These groups exhibit distinct ecological roles and reproductive strategies while sharing key structural and...
Methods to Assess Microbial Populations01:30

Methods to Assess Microbial Populations

Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...
Fungal Phylum Ascomycota01:28

Fungal Phylum Ascomycota

Phylum Ascomycota, a major division within the subkingdom Dikarya, comprises a diverse range of fungal species, including both unicellular yeasts and filamentous molds such as Aspergillus and Penicillium. These fungi thrive in a variety of habitats, from aquatic ecosystems to terrestrial environments, playing crucial ecological and economic roles.Morphology and ReproductionThe defining characteristic of Ascomycetes, commonly referred to as sac fungi, is the ascus—a sac-like structure that...
Overview of Fungi01:29

Overview of Fungi

Fungi are a diverse group of eukaryotes more closely related to animals than other eukaryotes. Fungal cell walls comprise chitin, a polysaccharide that provides structural strength, and glucans, which contribute to flexibility and integrity. Other polysaccharides, such as mannans and galactosans, may supplement or replace chitin in some fungi. These adaptations, along with their preference for acidic environments and tolerance for high osmotic pressure, enable fungi to thrive in various...