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Non-thermal processing has been developed to increase the quality and storage life of fruit juices in response to consumer desire. Ozonation is a recently developed method that generates volatile oxygen atoms that can eliminate a broad spectrum of microbes and extend the shelf stability of food products. The present research was intended to investigate the ozone processing on the physicochemical characteristics, microbiological quality, sensory attributes, and antioxidant potential of Kinnow juice. In this study, Kinnow juice was processed to 150 mg/h of ozone gas at a constant concentration for 5, 10, and 15 min. The sample was then taken in a plastic container and stored at 35°C ± 2 for three months. The results revealed that ozone processing had a significant (p˂0.05) effect on the total phenolics (TP) contents, total flavonoids (TF) contents, total soluble solids (TSS), acidity, total antioxidant activity (TAA) and DDPH radical scavenging activity of Kinnow juice. In addition, the ozonation application also significantly (p˂0.05) decreased the population of the microbes when the ozone time was increased from 5–15 min. Among the treatments, it was observed that T3 had the highest TSS, acidity, TF contents, TAA, and DDPH radical scavenging activity values and the lowest mold and plate counts. Regarding sensory qualities, T0+ showed the highest sensory score during storage. Thus, it may be concluded from the findings of our study that ozone application improved the quality of Kinnow juice by increasing TSS, phytochemicals and decreasing the microbial population, thereby prolonging their shelf life. [ABSTRACT FROM AUTHOR]

Consumer demand for higher-quality fruit juices has resulted in the development of non-thermal processing to extend the shelf life of fruit juices. Ozonation is a novel technique, involving the production of volatile oxygen atoms capable of destroying an extensive range of microorganisms and lengthening the shelf stability of fruit juices. The purpose of this research was to examine the influence of ozonation on the physicochemical, bioactive components, and microbial properties of kinnow juice. Kinnow juice was exposed to ozone gas with fixed concentration 150 mg/h for 5, 10, and 15 minutes. Then, kinnow juice was filled in a plastic bottle and kept at 4 ± 2°C for 3 months. The mentioned parameters were examined after 30 days, 60 days, and 90 days. It was found that ozonation had shown a significant influence on nutritional characteristics of kinnow juice as it increased (p ≤.05) the acidity, total soluble content, total phenolics content, flavonoids content, and antioxidant potential of kinnow juice and diminished the microbial activity, increasing ozone time from 5 to 15 minutes. OZ-15 (15 minutes of ozonation) showed the maximum value of total soluble content (14.70 ± 0.10 °Brix), titrable acidity (0.179 ± 0.10%), total flavonoid content (244.44 ± 3.70 mg equivalent of catechin/100 mL), and total antioxidant activity (305.95 ± 2.70 µg/g equivalent of ascorbic acid of juice), but it presented the least total mold counts (1.49 ± 0.02 colony forming unit/mL) and plate counts (1.53 ± 0.03 colony forming unit/mL). It was suggested that the ozonation could be used as an alternative to the traditional pasteurization and chemical preservatives on kinnow juice to retain quality characteristics. [ABSTRACT FROM AUTHOR]

Rasmalai is a very popular, delicious, and nutritious indigenous sweet dish in Indo‐Pakistani civilization. It has a very short shelf life, i.e., up to 3 days. The study was designed to assess the effect of preservatives (potassium sorbate and calcium propionate) on the shelf stability of Rasmalai. Moreover, proximate composition and sensory evaluation of prepared Rasmalai were also carried out in the present study. In general, potassium sorbate and calcium propionate significantly increased the shelf life of Rasmalai. But treatment (R5) containing a combination of both potassium sorbate and calcium propionate (500 ppm each) improved its shelf life by up to 12 days by keeping good sensorial characteristics. The maximum total plate counts as well as yeast and molds were observed in control Rasmalai (without any preservatives) whereas minimum counts were found in R5 treatment containing a combination of both potassium sorbate and calcium propionate (500 ppm each). In conclusion, all the preservatives used in the present study were effective in enhancing the shelf life of Rasmalai but R5 treatment containing a combination of both potassium sorbate and calcium propionate (500 ppm each) was the most effective in enhancing shelf life without deleterious effect on sensorial characteristics. [ABSTRACT FROM AUTHOR]