Variation in bioactive phytochemicals and sensory attributes of osmosonic convective dried ginger from four African countries

• Published in: Journal of the science of food and agriculture 2020-05, Vol.100 (7), p.3164-3172
• Main Authors: Osae, Richard, Alolga, Raphael N, Essilfie, Gloria, Osei‐Adjei, George, Baduweh, Cynthia A, Yarley, Otu Phyllis Naa, Zhou, Cunshan
• Format: Article
• Language: English
• Subjects: 6‐gingerol; Africa; African ginger; antioxidant activities; Antioxidants; Antioxidants - chemistry; Aquatic plants; Biological activity; Chemical composition; Convective drying; Cultivation; Desiccation; Drying; Electronic noses; Flavonoids; Flavonoids - chemistry; Food Handling; Ginger; Gingerol; Growth conditions; Humans; Metabolomics; Osmosis; osmosonication; Phenolic compounds; Phenols; Phenols - chemistry; Phytochemicals; Phytochemicals - chemistry; Plant Extracts - chemistry; Relative humidity; Rhizome - chemistry; Rhizomes; sensory attributes; Sensory properties; Spices; Taste; Volatile compounds; Zingiber officinale; Zingiber officinale - chemistry
• ISSN: 0022-5142; 1097-0010
• DOI: 10.1002/jsfa.10351

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