Work

Optimized Continuous Thermosonication for Sustainable Pasteurization of Orange and Dried Black Lime Juices: Techno‐Functional, Physicochemical, and Microbial Assessment

Year: 2025

Type: article

Abstract: ABSTRACT In pursuit of sustainable and efficient food processing solutions, a batch thermosonication system was successfully upgraded into a continuous thermosonication system (CTS) to improve pasteurization performance for orange juice (OJ) and dried black lime juice (DBLJ). The newly developed CTS integrates five core components: thermal heating, pumping, heat exchange, pasteurization, and electrical control units. Using response surface methodology, the effects of power (1.676–1.764 kW), mass flow rate (0.0142–0.0016 kg/s), and processing temperature (30°C–50°C) on the techno‐functional, physicochemical, and microbiological attributes of the juices were optimized. At optimal conditions, the CTS reduced specific energy consumption by 29.71% in OJ and 30.51% in DBLJ, relative to traditional pasteurization (TP: 90°C for 60 s), while improving energy efficiency and process productivity. No significant differences ( p > 0.05) were observed in pH, titratable acidity, or sensory characteristics compared to untreated fresh juice. Moreover, the residual activity of pectin methylesterase was effectively reduced to 7.48% ± 0.11% (OJ) and 6.42% ± 0.074% (DBLJ). Microbiological analysis revealed complete inactivation of total bacterial count, psychrotrophic bacteria, coliforms, and yeasts and molds. Additionally, RP‐HPLC analysis confirmed enhancement in the bioactive compound content in CTS‐treated juices compared to both fresh and TP samples. These findings demonstrate that the CTS approach offers a sustainable, energy‐efficient, and quality‐preserving alternative for juice pasteurization, highlighting its potential application in modern food processing industries.

Source: Food Science & Nutrition

DOI: 10.1002/fsn3.71171

Authors: Alaa R. Abdulstar, Asaad R. Al‐HiIphy, Ammar B. Altemimi, Rawaa H. Tlay, Tarek Gamal Abedelmaksoud

Institutions: University of Basrah, Damascus University, Cairo University

Language: English

Topic: Microbial Inactivation Methods

Subfield: Biotechnology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDGs: Responsible consumption and production, Zero hunger, Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $3,630