دوره 11 شماره 1 (2024)

Effects of Critical Storage Temperatures on Microbiological, Physico-chemical and Sensory Indicators of Sweetened Condensed Milk

بیوتکنولوژی غذایی کاربردی, دوره 11 شماره 1 (2024), 18 آبان 2023 , صفحه e12
https://doi.org/10.22037/afb.v11i1.44478

چکیده

Background and Objective: Principles of osmo and thermoanabiosis are used to produce sweetened condensed milks. Regarding their extended shelf lives, there are demands for their export to countries with various climates. However, high-positive and low-negative ambient temperatures during sweetened condensed milks transportation can affect their quality. Hence, it is important to study effects of critical storage temperatures on microbiological, physicochemical and sensory indicators of sweetened condensed milks.

Material and Methods: This investigation included a comprehensive study of the physicochemical, microbiological and sensory characteristics of sweetened condensed milks after storage under conditions involving multiple-stage and single-stage temperature changes within various ranges (from 5 to 50 °C; from 5 to -50 °C, from 50 to -50 °C and reverse cycles.).

Results and Conclusion: Analysis of samples subjected to cyclic changes, including multiple-stage heating for 9 d followed by multiple-stage cooling for 11 d, revealed that only viscosity changed relative to the control samples. In the reverse similar cycle (cooling to heating), formation of destabilized fat was observed. Moreover, changes of cycles and subsequent storage of the samples for 6 m led to increased viscosity, compared to control samples. It was established that single-stage freezing with a 14-d storage did not critically affect its quality. In contrast, rapid heating of the sweetened condensed milk up to 50 °C and storage under such critical conditions outside a cooled storage area were unacceptable. Further storage of samples subjected to cycles of single-stage freezing and heating for 6 m demonstrated a complete non-compliance with control samples for all parameters. Thus, sweetened condensed milk can be subjected to single-stage freezing to -50 °C and storage for 14 d, as well as multiple-stage cooling/freezing to -50 °C and multiple-stage heating to 50 °C following by cooling to 5 °C without loss of quality and safety during 6 m.

Conflict of interest: The authors declare no conflict of interest.

کلمات کلیدی:
  • Critical storage temperatures
  • Extracellular enzymes
  • Protein and fat degradations
  • psychrotrophic bacteria
  • Sweetened condensed milks
  • Transportation

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