Whey acerola-flavoured drink submitted ohmic heating processing: Is there an optimal combination of the operational parameters?. (15th April 2018)

• Record Type: Journal Article
• Authors: Cappato, Leandro P.; Ferreira, Marcus Vinícius S.; Pires, Roberto P.S.; Cavalcanti, Rodrigo N.; Bisaggio, Rodrigo C.; Freitas, Mônica Q.; Silva, Marcia C.; Cruz, Adriano G.
• Is Part Of: Food chemistry. Volume 245(2018)
• Page Start: 22
• Page End: 28
• Publication Date: 2018-04-15
• Subjects: Ohmic heating -- Whey dairy beverages -- Color parameters -- Rheology -- Microstructure -- Ascorbic acid degradation; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2017.10.019
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Whey acerola-flavoured drink submitted to Ohmic heating (OH). Absence of D-values acid ascorbic was noted at OH in different voltages. OH proportionated increased color parameters. OH provided an increase in viscosity. OH was responsible for a progressive increase in cell disruption. Abstract: Whey acerola-flavoured drink was treated using ohmic heating (OH) at 65 °C for 30 min to evaluate different frequencies (10, 100 and 1000 Hz with 25 V) and voltages (45, 60 and 80 V at 60 Hz) and by conventional heating (CH) with the same temperature profile (65 °C/30 min). Rheology parameters, color changes (h°, C∗, ΔE) microstructure (optical microscopy), and ascorbic acid (AA) degradation kinetics were performed. AA degradation rates ranged from 1.7 to 29.3% and from 2.8 to 24.8% for OH and CH, respectively. The beverages treated with both processes exhibited a pseudo-plastic behavior (n < 1), higher saturation ( C∗ ), lesser reddish color ( h° ), and higher color variations (Δ E∗ ). In microstructure analysis, OH (1000 Hz–25 V and 80 V–60 Hz) was able to rupture the cell structure. The best results were observed at low frequencies and voltage OH processes on whey acerola-flavoured drinks should be performed at low frequencies and voltages (≤100 Hz and 45 V), an alternating current (A/C). However, despite the use of inert electrodes, the existence of corrosion was not evaluated, being an important information to be investigated.