![Processes and Food Production Equipment](/images/mag-ihbt.png)
Development of technology for the production of green coffee robusta extracts (Coffea canephora): selection of grinding degree and extraction temperature
![Processes and Food Production Equipment](/images/mag-ihbt.png)
Annotation
The aim of the study was to determine the parameters of the optimal grinding degree and extraction temperature for Robusta coffee beans (Coffea canephora), which allow the most complete extraction of antioxidant substances. In the extracts, the total content of phenols, flavonoids, tannins, antiradical activity by the DPPH method, and the restoring force by the FRAP method were determined. The objects of the study were extracts obtained from Robusta coffee beans, ground to a size of 0.5, 1.0, and 1.6 mm, in a solvent of 25% water/75% ethanol. The extraction temperature was determined at the optimum fineness. The variables are 20–25°С; 40–50°С, and the boiling point of the solvent. The maximum values of the totalcontent of phenolic substances (864 mg (HA)/100 g) and the restoring force (14.04 mmol Fe2+/kg) were found in the extract of Robusta coffee with a grinding degree of 0.5. The highest values for the total content of flavonoids (492 mg (K)/100 g) were found for extracts of Robusta coffee with a fineness of 1.0. Low antiradical activity (Ec50 = 5.3 mg/cm3) was found in Robusta coffee with a grinding of 0.5. The extracts heated to a temperature of 40–50°C show high values of the content of phenols (864mg (HA)/100 g) and the restoring force (15.93 mmol Fe2+/kg). The total content of flavonoids (652 mg (K)/100 g),tannins (186.6 mg of catechin/100 g), and the lowest antiradical activity (Ec50 = 0.8 mg/cm3) are observed in extracts with an extraction temperature equal to the boiling point of the solvent. These results confirm that such technological factors as the degree of grinding and extraction temperature significantly affect the extraction of antioxidant substances and should be taken into account to optimize the extraction of antioxidants from coffee, which can later be used effectively as ingredients for functional food products.
Keywords
Постоянный URL
Articles in current issue
- The non-destructive express method for determination of ethyl alcohol and total extract of wines
- The influence of ultrasonic treatment on the anaerobic processing of brewer’s spent grains into biogas
- L-arabinose caramelization in the presents of L-ascorbic acid in ethanolic medium
- Development of structural-parametric and mathematical models for separating sunflower seeds for halva production
- An original method for the experimental determination of the dynamic viscosity coefficient for high-viscosity media and its determination for sheep tail fat
- Development of technology for the production of green coffee robusta extracts (Coffea canephora): selection of grinding degree and extraction temperature
- Using the enzyme Ultraflo Max to reduce phytic acid and phytates in soybeans during steeping