Yeast and Molds

1
Yeast and Molds

• Food Microbiology

2
Molds

• Mycelium
• Hyphae
• Produce Spores
• For Reproduction
• Easily Spread
• NOT Resistant like
• bacterial Spores

Mold Hyphae
Mold Hyphae and Spores
3
Molds

• Growth
• Low moisture
• Wide Range of pH
• Mesophilic and Psychrotrophic
• Most aerobic
• Significance
• Spoilage
• Sanitation Index
• Health Issues
• Produce Foods

4
Molds

• Mucor
• Rhizopus
• Penicillium
• Geotrichum
• Fusarium
• Nuerospora
• Botrytis
• Sporotrichum
• Alternaria

5
Molds
Mucor
Rhizopus
Penicillium
Geotrichum
Fusarium
Neurospora
Botrytis
Alternaria
6
Yeast

• Single Cell Fungi
• Some Reproduce by Budding
• Some Divide in Half

7
Yeast

• Oxidative and Fermentative
• Aerobic and Anaerobic

Fermentative
Oxidative
8
Yeast

• Growth
• Less Water than Bacteria
• Mesophilic and Psychrotrophic
• pH 4.0-4.5
• Significance
• Spoilage
• Indicator
• Food Uses

9
Yeast

• Saccharomyces
• Torulopsis
• Candida
• Rhodotorula

10
Yeast
Candida
Sacharomyces