Comparison of different drying methods on the physical properties, bioactive compounds and antioxidant activity of raspberry powders

Si, Xu; Chen, Qinqin; Bi, Jinfeng; Wu, Xiaoqing; Yi, Jianyong; Zhou, Linyan; Li, Zhaolu

doi:10.1002/jsfa.7317

Cited by 82 publications

(83 citation statements)

References 44 publications

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“…The significantly lowest reducing power was noted in samples treated with US‐IR1 (1.62 mg g −1 dm) (Table ). These results are in accordance with the findings of Si et al () where infrared drying proved better than different drying methods tested for raspberry.…”

Section: Resultssupporting

confidence: 93%

Effect of infrared drying with multifrequency ultrasound pretreatments on the stability of phytochemical properties, antioxidant potential, and textural quality of dried sweet potatoes

Rashid

Jatoi

et al. 2019

J Food Biochem

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The study aims to determine drying of sweet potatoes using multifrequency ultrasound (US) pretreatments (20, 40, and 60 kHz) at three different infrared (IR) drying temperatures (60, 70, and 80°C) and evaluate the phytochemical and textural quality of the dried product. Drying time was significantly decreased in moderate US frequency (40 kHz) at 70°C with the increasing drying temperature. Comparing to the fresh samples, the dried samples showed the highest amount of phytochemical contents. The antioxidant activity of the samples increased especially at 60 kHz and 80°C, while US‐IR treatments shown a positive impact on total carotenoids contents and β‐carotene. For phenolic compounds, Ellagic acid and Rutin were quantified in higher amount while Quercetin‐3‐rhamnoside and Quercetin 3‐β‐D‐glucoside were two new compounds identified for the first time in sweet potatoes. FTIR spectra showed the successful synthesis of OH group and phenolics in samples treated with the US at 20 kHz. Practical applications This study investigated the effects of multifrequency ultrasound with different infrared drying temperatures. The study provides evidence that infrared drying application in synergy with ultrasonic pretreatments can improve drying efficiency and food quality much better than using each method alone. Total phenolic contents and total flavonoid contents remained stable at US 40 kHz and 60°C conditions. The findings showed that moderate ultrasound frequency (40 kHz) at 60°C improved phytochemical properties while antioxidant activities showed better preservation response at 80°C with 60 kHz. In addition, the samples treated with the same US treatment at 40 kHz showed less cell breakage in SEM analysis.

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Section: Resultssupporting

confidence: 93%

Effect of infrared drying with multifrequency ultrasound pretreatments on the stability of phytochemical properties, antioxidant potential, and textural quality of dried sweet potatoes

Rashid

Jatoi

et al. 2019

J Food Biochem

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“…The highest reducing power of MEHO at all the tested concentrations might be due to the phenolic compounds, especially Balanocarpol, Hopeaphenol and Ampelopsin H the major compounds of H. odorata , playing pivotal role in reducing power of the extracts. [47]. …”

Section: Discussionmentioning

confidence: 99%

Antioxidant, antidiarrheal, hypoglycemic and thrombolytic activities of organic and aqueous extracts of Hopea odorata leaves and in silico PASS prediction of its isolated compounds

Kabir

Hossain

Kabir

et al. 2016

BMC Complement Altern Med

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Background Hopea Odorata, locally known as Telsur (Bangladesh), has some traditional uses as folk medicine. This study aims to investigate the antioxidant, antidiarrheal, hypoglycemic and thrombolytic activities of H. odorata leaf extracts as new therapeutic prospects predicting the activity of some of the isolated compounds of this plant.MethodsLeaves of Hopea odorata was extracted with pure methanol (MEHO), ethanol (EEHO) and water (AEHO). The extract was tested for antioxidant activity by using reducing power and H2O2 scavenging assay. Antidiarrheal effects were assayed by three standard methods of bioassay: Castor oil-induced diarrhea, Castor oil induced enteropooling and gastrointestinal transit test. Hypoglycemic effect was determined by normoglycemic model of mice. Thrombolytic activity was evaluated by clot lyses test for human and mice blood. In silico PASS prediction was applied for phytoconstituents namely Balanocarpol, Hopeaphenol and Ampelopsin H isolated from this plant. ResultAmong the all extracts, MEHO exhibited strong antioxidant activity in both reducing power and H2O2 scavenging assay. Phenol content of MEHO was 297.22 ± 0.78 mg/g and flavonol content was 91.53 ± 1.82 mg/g. All the experiment of extracts at dose of 200 and 400 mg/kg and the standard drug loperamide (5 mg/kg) showed significant (p < 0.001) inhibition against castor oil induced diarrhea and castor oil induced enteropooling in mice. There were also significant (p < 0.01) reduction in gastrointestinal motility in the charcoal meal test. Leaf extract showed no significant (P < 0.01) decrease of blood glucose compared to Glibenclamide in normoglycemic mice. Using an in vitro thrombolytic model, MEHO showed the highest and significant clot lysis of human and mice blood compared to Streptokinase. PASS predicted the wide range of antioxidant, free radical scavenger, Nitric oxide scavenger, cardioprotectant, hepatoprotectant, thrombolytic, fibrinolytic, antibacterial, antifungal, anticarcinogenic, anthelmintic and anti-inflammatory activity of examined phytoconstituents.ConclusionThese findings suggest that the plant may be a potential source of new antidiarrheal, thrombolytic and antioxidative agents but it is found to have no antidiabetic capability. PASS prediction matched with present study for the extracts. Further study needs to identify the PASS predicted biological actions of the phytoconstituents.Electronic supplementary materialThe online version of this article (doi:10.1186/s12906-016-1461-x) contains supplementary material, which is available to authorized users.

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“…SI of seed samples dried at different temperatures (303.15, 313.15, 323.15, and 333.15 K) was determined by adapting the method of Si et al (). Crushed seed samples (2 g; m 0 ) were mixed with 25 mL of distilled water in preweighed centrifuge tubes.…”

Section: Methodsmentioning

confidence: 99%

Mathematical modeling and effect of drying temperature on physicochemical properties of new commercial grape “Kyoho” seeds

Sridhar

Charles

2019

J Food Process Engineering

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Grape seeds (Kyoho: Vitis labruscana), an agricultural waste with value‐added potential, was investigated for the relationship between its physicochemical properties and drying temperature fitted with four thin layer drying models in a hot air oven. Experimental moisture ratio decreased with an increase in drying temperature; moreover, moisture diffusivity (Deff) ranged from 2.69 ± 1.82 × 10−8 (303.15 K) to 8.68 ± 1.25 × 10−8 (333.15 K) m2/s with activation energy of 33.72 ± 0.76 kJ/mol (R2 = 0.9914). Logarithmic (303.15 K: R2 = 0.9944, 333.15 K: R2 = 1) and Henderson–Pabis (313.15 K: R2 = 0.9611, 323.15 K: R2 = 0.9706) models were the most suitable for predicting experimental drying curves. Drying temperature had significant (p < .001) effects on physicochemical properties of Kyoho seeds except for color (1.36 ± 0.13 to 1.76 ± 0.29) and oil holding capacity (0.70 ± 0.01 to 0.94 ± 0.02 g/g). This study demonstrated the role of drying models to develop grape seed value‐added products. Practical applications The study was conducted to investigate the thin layer drying characteristics of Kyoho seeds at different drying temperatures. Moreover, the effect of drying temperature on physicochemical properties was evaluated. The proposed models should be useful to understand the behavior of drying models and predicted the effect of drying temperature on physicochemical properties. The insights gained from this study may be useful in food processing industries for designing grape seed drying equipment, which may contribute to the development of value‐added products from grape seeds.

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Comparison of different drying methods on the physical properties, bioactive compounds and antioxidant activity of raspberry powders

Abstract: Overall, combined drying methods, especially IR-MVD, were found to result in better quality of raspberry powders among the thermal drying techniques. IR-MVD could be recommended for use in the drying industry because of its advantages in time saving and nutrient retention.

Cited by 82 publications

References 44 publications

Effect of infrared drying with multifrequency ultrasound pretreatments on the stability of phytochemical properties, antioxidant potential, and textural quality of dried sweet potatoes

Effect of infrared drying with multifrequency ultrasound pretreatments on the stability of phytochemical properties, antioxidant potential, and textural quality of dried sweet potatoes

Antioxidant, antidiarrheal, hypoglycemic and thrombolytic activities of organic and aqueous extracts of Hopea odorata leaves and in silico PASS prediction of its isolated compounds

Mathematical modeling and effect of drying temperature on physicochemical properties of new commercial grape “Kyoho” seeds

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