The effect of vinegar and drying (Solar and Open Sun) on the microbiological quality of ginger (ZINGIBER OFFICINALE ROSCOE) rhizomes

Roseline Esi Amoah, Sureshkumar Kalakandan, Faustina D. Wireko-Manu, Ibok Oduro, Firibu Kwesi Saalia, Ebenezer Owusu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

This study evaluated the influence of 10% vinegar and solar drying using two solar dryers and open-sun drying on the microbiological quality of ginger (Zingiber officinale Roscoe) rhizome. The rhizomes were analyzed for bacterial, mold, and Salmonella populations in the raw state, which were water-washed and soaked in 10% vinegar, and in dried form. The fungal population was isolated and identified. Fresh and dried ginger rhizome contained both bacterial and fungal population in the range of 3.0 x 102 ± 1.14 x 102 to 2,180 x 109 ± 70.7 x 109 CFU/g. The stainless steel solar dryer had fewer fungal loads among the drying methods. Aspergillus and Penicillium species of mycotoxin-producing potential were identified. The 10% vinegar as pretreatment showed no significant difference (p ≤.05) in the bacterial population reduction but in the fungal population reduction. Growth of fungi in fresh and dried ginger extracts was lower compared with growth in Potato Dextrose Broth.

Original languageEnglish
Pages (from-to)6112-6119
Number of pages8
JournalFood Science and Nutrition
Volume8
Issue number11
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Ginger
  • Microbial load
  • Rhizomes
  • Solar drying
  • Vinegar

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