Sugar, d-pinitol, volatile composition, and antioxidant activity of carob powder roasted by microwave, hot air, and combined microwave/hot air
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ID: 90146
2019
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Abstract
The effects of hot air, microwave, and combined microwave/hot air roasting on physical and chemical properties of carob powder were determined. The comparison of different roasting processes was evaluated whether the combined microwave/hot air roasting could be an alternative to other roasting methods or not. The moisture content (2.86%–5.03%), water activity (0.20–0.35), and pH (4.94–5.12) values of the carob powder decreased by increasing microwave power and roasting time; whereas total phenolic content (10.13–13.74 mg/g dm), total antioxidant activity (0.69–1.53 g/mg DPPH), browning index (23.57–70.30), and UV absorbance (427.41–701.05) increased. Hunter L (41.54–55.28) and b (16.45–20.91) values of the carob powder decreased after roasting while color value a (8.88–20.91) increased. The main sugar was sucrose (317.54–347.68 mg/kg), followed by fructose (80.98–90.11 mg/kg), and glucose (45.16–62.19 mg/kg). Roasting process reduced the sugar content while increased the d-pinitol (62.41–76.71 mg/kg) content. The main volatile was isobutyric acid (acidic/butter odor). Hot air and the combined microwave/hot air roasted samples showed similar volatile and sensorial profile. According to the results, the combined microwave/hot air roasting consumed 50% less energy than the hot air roasting and got the best sensory scores.
| Reference Key |
gunel2019sugarjournal
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| Authors | Gunel, Zehra;Torun, Mehmet;Sahin-Nadeem, Hilal |
| Journal | journal of food processing and preservation |
| Year | 2019 |
| DOI |
10.1111/jfpp.14371
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| URL | |
| Keywords | Keywords not found |
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