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International Journal of Medicinal Mushrooms
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ISSN Imprimir: 1521-9437
ISSN En Línea: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.2018025833
pages 243-258

Novel Kombucha Beverage from Lingzhi or Reishi Medicinal Mushroom, Ganoderma lucidum, with Antibacterial and Antioxidant Effects

Aleksandra Sknepnek
Institute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
Milena Pantić
Institute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
Danka Matijašević
Institute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
Dunja Miletić
Institute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
Steva Lević
Institute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
Viktor Nedović
Institute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
Miomir Niksic
lnstitute for Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Belgrade, Serbia

SINOPSIS

Kombucha is a nonalcoholic beverage traditionally made by fermenting black tea using a combination of yeast and acetic acid bacteria (AAB) cultures. Ganoderma lucidum hot water extract (HWE) was used—to our knowledge for the first time—to prepare a novel, health-promoting kombucha product. During the 11-day fermentation, pH, total acidity, and the numbers of yeasts and AAB were monitored. It was found that sweetened G. lucidum HWE was a good medium for yeast and AAB growth. The desired acidity for the beverage was reached on the second day (3 g/L) of the fermentation process; the maximum established acidity was 22.8 ± 0.42 g/L. Fourier transform infrared analysis revealed that the vacuum-dried beverage is a mixture of various compounds such as polysaccharides, phenols, proteins, and lipids. Total phenolic content of the liquid sample was 4.91 ± 0.2338 mg gallic acid equivalents/g, whereas the vacuum-dried sample had a smaller amount of phenolics (2.107 ± 0.228 mg gallic acid equivalents/g). Established half-maximal effective concentrations for DPPH scavenging activity and reducing power were 22.8 ± 0.17 and 10.61 ± 0.34 mg/mL, respectively. The antibacterial testing revealed that activity does not originate solely from synthesized acetic acid. The liquid G. lucidum beverage was the most effective against the tested bacteria, with the lowest minimum inhibitory concentration (0.04 mg/mL) against Staphylococcus epidermidis and Rhodococcus equi, and a minimum bactericidal concentration (0.16 mg/mL) against Bacillus spizizenii, B. cereus, and R. equi. The vacuum-dried sample was less effective, with the lowest minimum bactericidal concentration against the Gram-positive bacteria R. equi (1.875 mg/mL) and against the Gram-negative bacteria Proteus hauseri (30 mg/mL).


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