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Variation in bioactive phytochemicals and sensory attributes of osmosonic convective dried ginger from four African countries
Author(s) -
Osae Richard,
Alolga Raphael N,
Essilfie Gloria,
OseiAdjei George,
Baduweh Cynthia A,
Yarley Otu Phyllis Naa,
Zhou Cunshan
Publication year - 2020
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.10351
Subject(s) - rhizome , zingiber officinale , food science , traditional medicine , antioxidant , antioxidant capacity , biology , botany , medicine , biochemistry
Abstract BACKGROUND The rhizome of ginger ( Zingiber officinale Roscoe) is one of the most patronized spices worldwide and plays an important role in folklore medicine. In this study, we aimed to determine the quality of ginger samples from representative West African (Ghana, Nigeria) and East African (Uganda, Kenya) countries. By that, we also implicitly sought to determine the probable influence of location of cultivation (and the intrinsic growth conditions) on the quality of the samples. The ginger samples were pretreated by osmosonication prior to relative humidity convective drying and analyzed for differences in their metabolomes, total phenolic content (TPC) and total flavonoid content (TFC), antioxidant activities, sensory characteristics and volatile compounds composition (via electronic‐nose determination). RESULTS The outcome of our study showed marked source‐dependent differences in the metabolomes of the samples as captured by a metabolomics approach. Based on the findings of the metabolomics study, 6‐gingerol content was quantified and found to be higher in the samples of West African origin. Also, the samples from the two West African countries contained higher levels of bioactive phytochemicals as evinced by the results of TPC, TFC, e‐nose analysis, and antioxidant activities. They also gave better sensory attributes. CONCLUSION In summary, for all parameters assessed, and on a country‐by‐country basis, the general quality trend observed was: Ghana > Nigeria > Uganda > Kenya. All results taken together, our findings at least in part, point to the influence of geographical regions of cultivation on the quality of the ginger rhizomes. © 2020 Society of Chemical Industry