Abstract
The effects of three concentration of ginger (Zingiber officinale) on some storage characteristics of zobo concentrate were investigated. Zobo drink was prepared using the traditional methods. The drinks were then concentrated by dehydration to 67%. Increasing concentration of ginger, 10, 5 and 0% were added to produce sample A, B and C, respectively and stored in opaque packaging materials for 28 days. The results showed that retained colour of sample A (0.84±0.05) was significantly higher than that of the sample C (0.74±0.02) at the end of the duration of storage analysis. pH (2.87±0.03) for sample A was significantly higher than that of the sample C (2.20±0.02). The results of total soluble solids (TSS) and total titratable acidity (TTA) were not significantly different for all the samples. The results for sensory evaluation at p<0.05 showed that for flavor, sample A (7.0±0.6) was significantly different from sample C (5.8±0.2), for taste (7.0±0.6), it was significantly different from sample C (5.8±0.4), for colour (7.8±0.6) it was significantly different from sample C (7.1±0.1), for mouth-feel (7.2±0.7) it was not significantly different for all the samples. Generally, sample A (7.9± 1.3) was the most acceptable, while sample C (6.3±0.3) was the least acceptable and there was significant difference among the samples. Key words: Zobo concentrate, ginger, retained colour, storage characteristic.
Highlights
Zobo drink is a local, cheaper soft drink made fromHibiscus sabdariffa calyx which is an herbaceous medicinal plant grown in the tropics (Adesokan et al., 2013)
The results showed that retained colour of sample A (0.84±0.05) was significantly higher than that of the sample C (0.74±0.02) at the end of the duration of storage analysis. pH (2.87±0.03) for sample A was significantly higher than that of the sample C (2.20±0.02)
The demand for zobo drinks is due to its low prices, nutritional and medicinal properties (Oboh and Elusiyan, 2004; Osueke and Ehirim, 2004)
Summary
Hibiscus sabdariffa calyx which is an herbaceous medicinal plant grown in the tropics (Adesokan et al., 2013). The zobo concentrated is a dehydrated water extract of the dried petals of the Rosselle plant (H. sabdariffa) International License red in colour and is a rich source of vitamins and minerals such as calcium and iron It is prepared by first boiling the leaves of the rosselle (that is the dried leaves), spiced up with ginger and cloves, sweetened with sugar to produce the sorrel red drink. The corresponding scale reading was taken as the total soluble solid (°brix) of the concentrate
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