Sono-photodynamic inactivation of Escherichia coli and Staphylococcus aureus in orange juice

Bhavya, M.L.; Hebbar, H. Umesh

doi:10.1016/j.ultsonch.2019.05.002

Cited by 54 publications

(41 citation statements)

References 47 publications

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“…In fact, some workers claim to have a precise control of the system temperature carrying out isothermal treatments using jacketed glassware, 13,19,25,26 ice, water, or ethanol baths 12,25 . Others reported that, despite working with similar systems, increases in temperature were indeed registered 27,28 . To the best of our knowledge, only Parniakov et al ., 14 studying the UAE of polyphenols and chlorophylls from the microalgae Nannochloropsis spp., presented a thermal profile associated with ultrasound treatments performed under non‐isothermal conditions, and these profiles follow the same pattern as the one presented in this study.…”

Section: Resultsmentioning

confidence: 99%

Development of an aqueous ultrasound‐assisted extraction process of bioactive compounds from beet leaves: a proposal for reducing losses and increasing biomass utilization

et al. 2020

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BACKGROUND Red beet plants are cultivated worldwide for the consumption of their roots, generating large amounts of unexploited by‐products. In particular, beet leaves (BLs) represent about 50% of the whole plant and are usually discarded as waste. This constitutes not only an economic issue, since multiple resources invested in the production will be wasted, but also an environmental problem because of the pollution associated with their disposal. However, BLs comprise an important source of functional compounds (polyphenols and betalains) that could be recovered from the raw material, representing a sustainable solution for the underutilization of this by‐product. This study proposes the recovery of polyphenols and betalains using an aqueous ultrasound‐assisted extraction (UAE) process at different powers (35, 50, and 100 W) that was characterized and optimized. RESULTS UAE significantly enhanced the recovery of bioactive compounds and shortened the time required for extraction in comparison with traditional macerations (35 < 50 < 100 W). During UAE, the temperature of the systems increased as a function of the power applied, favouring the recovery of these phytochemicals. Additionally, a Box–Behnken design and response surface methodology were employed to optimize UAE conditions (90 W ultrasound power, 1:20 solid:liquid ratio, 16 min extraction time), under which the yields were 14.9 mg g−1 (polyphenols), 949.1 μg g−1 (betaxanthins), and 562.2 μg g−1 (betacyanins), consistent with the values predicted by the models. CONCLUSION This study enabled the development of a green‐solvent UAE process that constitutes an effective post‐harvest by‐products strategy to minimize losses and increase biomass utilization through the recovery of bioactive compounds from BLs, promoting sustainability in the agri‐food chain. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Development of an aqueous ultrasound‐assisted extraction process of bioactive compounds from beet leaves: a proposal for reducing losses and increasing biomass utilization

et al. 2020

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“…However, this method has been known to cause nutritional degradation and undesirable changes in the natural sensory characteristics of sugarcane juice (Chauhan et al, 2002). Non-thermal treatments such as ultrasound treatment have been actively explored in recent years, as it involves minimal processing (Abbasi et al, 2019;Balthazar et al, 2019;Bhavya & Hebbar, 2019;Guimarães et al, 2019b;Mohd Khairi et al, 2018;Soltani et al, 2018). Minimal processing would significantly help to retain several nutritional and antioxidant properties of the product (Fernández-Barbero et al, 2019;Guimarães et al, 2019a;Guimarães et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

The effect of sonication and heat treatment on the physicochemical, nutritional and microbiological properties of different sugarcane variants

et al. 2020

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Red sugarcane (RS) is a lesser bred of sugarcane variant in Malaysia compared to yellow sugarcane (YS), thus less data is available regarding this species. On this study, the physicochemical and microbiological properties of RS was determined and compared with YS under different conditions. Both sugarcane variants were subjected to heat and sonication treatments for 5 and 15 minutes as a method for preservation. RS contains a higher °Brix (15) compared to YS (14), and was unchanged while YS demonstrated a significant reduction. Furthermore, RS displayed a superior fructose (+802%), glucose (+119%) and sucrose (+17.91%) levels in all samples and they were largely preserved during both treatments. However, RS was sensitive to colour changes, as darker juice (decrease in lightness and increase in redness) was produced after treatments. RS possessed lower phenolic content (-31.15%) and antioxidant activity (-11.51%) than YS, and was significantly affected by both treatments. Sonication was more effective in reducing the microbial content than heat in both treatments. These findings indicated that RS is better at retaining its physicochemical properties under preservation treatment, but less resistant in preserving its appearance and nutritional values.

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“…The low-frequency ultrasound treatments consisted of applying an ultrasound power of 325 W (UCD-150 Raypa Leading Lab Technologies, Terrassa, Barcelona, Spain) to the gulupa pulp, varying the frequency (30 and 40 kHz) and the exposure time (10, 20, and 30 min), obtaining six (6) treatments and one (1) control sample. The treatments chosen in this work were based on the results from [10,11,24,26], in which frequencies of 20 kHz were used.…”

Section: Treatmentsmentioning

confidence: 99%

“…The technique is considered low-energy, environmentally friendly, and reduces chemical and physical risks, with minimal processing time. The technique is considered low-energy, environmentally friendly, reduces chemical and physical risks, and has minimal processing time [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pretreatment with Low-Frequency Ultrasound on Quality Parameters in Gulupa (Passiflora edulis Sims) Pulp

et al. 2021

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The Gulupa (Passiflora edulis f. edulis Sims) is an expression of South America’s tropics’ biodiversity, and a source of B vitamins and amino acids. It is a climacteric export fruit for which it is necessary to incorporate emerging technologies for its conservation and transport. This work investigated the effect of ultrasound on gulupa pulp and verified the stability of the characters of interest in the shelf life of 20 days. Six treatments and a control sample were used, evaluated in triplicate, and varied in frequency (30 and 40 kHz) with an exposure time of 10, 20, and 30 min. A statistical analysis of unidirectional variances and Dunnett’s test was used. It was found that the ultrasound treatments did not affect the pH or the titratable acidity. Soluble solid results presented a significant increase (p < 0.05) (from 13.4 to 14.8% w/v) in the antioxidant capacity (from 1.13 to 1.54 µmol Trolox Equivalent (TE)/g by the ABTS•+ (2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) Cationic Radical Assay and from 3.3 to 3.7 µmol TE/g by the DPPH· (2,2-diphenyl-1-picrilhydrazil) Radical Scavenging Assay). During the shelf life, ascorbic acid was the parameter that varied most (p < 0.05). It decreased from 42.7 to 21.6 mg ascorbic acid/100 g of pulp in the control sample. However, a smaller decrease was observed (23.8–24.5 mg ascorbic acid/100 g of pulp) in the 40 kHz treatments. The smallest global color difference (ΔE) for the control was found in the 40 kHz treatment at 30 min through the entire shelf life (day 0 to 20). Ultrasound treatment offers a new strategy to improve and extend the shelf life of chilled gulupa pulp.

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Sono-photodynamic inactivation of Escherichia coli and Staphylococcus aureus in orange juice

Cited by 54 publications

References 47 publications

Development of an aqueous ultrasound‐assisted extraction process of bioactive compounds from beet leaves: a proposal for reducing losses and increasing biomass utilization

Development of an aqueous ultrasound‐assisted extraction process of bioactive compounds from beet leaves: a proposal for reducing losses and increasing biomass utilization

The effect of sonication and heat treatment on the physicochemical, nutritional and microbiological properties of different sugarcane variants

Effect of Pretreatment with Low-Frequency Ultrasound on Quality Parameters in Gulupa (Passiflora edulis Sims) Pulp

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