scholarly journals Effect of Sonication Duration in the Performance of Polyvinyl Alcohol/Chitosan Bilayer Films and Their Effect on Strawberry Preservation

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1408 ◽  
Author(s):  
Jie Ding ◽  
Rong Zhang ◽  
Saeed Ahmed ◽  
Yaowen Liu ◽  
Wen Qin
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Vapor Permeability ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Solid Content ◽  
Bilayer Film ◽  
Vapor Permeability ◽  
Soluble Solid Content ◽  
Health Food ◽  
Bilayer Films

In this study, we fabricated polyvinyl alcohol (PVA)/chitosan (CS) bilayer films by casting and investigated the effects of preparation conditions and CS content (2, 2.5, or 3 wt.%) on the ability of these films to preserve packaged strawberries. The best performance was achieved at a CS loading of 2.5 wt.% (ultrasound time, 25 min); the strain and stress values were 143.15 ± 6.43% and 70.67 ± 0.85 MPa, respectively, oxygen permeability was 0.16 ± 0.08 cm2·m2·day−1·MPa−1, water vapor permeability was 14.93 ± 4.09 g·cm−1·s−1·Pa−1, and the shelf life of fresh strawberries packaged in the PVA/CS 2.5 wt.% bilayer film was determined to be 21 days at 5 ± 2 °C and a relative humidity of 60 ± 5%. Treatment with PVA/CS bilayer films prevented the decrease in the firmness of strawberries during storage (21 days). The evaluated physicochemical parameters (weight loss, decay, firmness, titratable acidity, soluble solid content, ascorbic acid content, and color) indicated that treatment with PVA/CS bilayer films led to better maintenance of the fruit quality. We believe that our study makes a significant contribution to literature because it paves the way to the fabrication of smart packaging materials and facilitates the commercialization of fresh strawberries as an important health food.

Role of Phospholipase D Inhibitor in Regulating Expression of Senescencerelated Phospholipase D gene in Postharvest Longan Fruit

2019 ◽  
Vol 14 (7) ◽  
pp. 649-657 ◽  
Author(s):  
Li Li ◽  
Jiemin Li ◽  
Jian Sun ◽  
Ping Yi ◽  
Changbao Li ◽  
...  
Keyword(s):  
Phospholipase D ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Significant Inhibition ◽  
Solid Content ◽  
Total Soluble Solid ◽  
Total Phenolic ◽  
Soluble Solid Content ◽  
Soluble Solid ◽  
Pericarp Browning

Background: Phospholipase D (PLD)is closely related to browning and senescence of postharvest longan fruit. Objective: This study investigated the effects of 2-butanol (a PLD inhibitor) on the expression and regulation of PLD during storage of longan fruit at a low temperature. Methods: Senescence-related quality indices showed that the 2-butanol-treated fruit presented lower pericarp browning index, pulp breakdown index and total soluble solid value than the untreated fruit. Results: The fruit treated by 60 µL/L 2-butanol exhibited the strongest inhibition on senescence, which significantly delayed changes in weight, titratable acidity content, total soluble solid content and ascorbic acid content. This treatment maintained a high level of total phenolic content and caused significant inhibition on pericarp browning and pulp breakdown. Through ELISA method, 60 µL/L 2-butanol treatment also reduced PLD activity. Real-time RT-PCR (RT-qPCR) results showed that PLD mRNA expression level was inhibited by 60 µL/L 2-butanol within 15 days. Western-blotting results further confirmed the differential expression of PLD during storage, and a relatively higher expression for PLD protein was found in control compared to the 2-butanoltreated fruit during 15-d storage. Conclusion: These results provided a scientific basis and reference to further investigating postharvest longan quality maintenance by regulating the PLD gene expression.

Development of Garcinia Atroviridis (Asam Gelugur) during Fruit Growth

2020 ◽  
Vol 73 (1) ◽  
pp. 12-20
Author(s):  
O. Nur Allisha ◽  
O. Zaulia ◽  
M. A. I. Mohd Shukri ◽  
M. N. Suriani ◽  
G. Nur Syafini ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Fruit Development ◽  
Fruit Set ◽  
Health Benefit ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Solid Content ◽  
Soluble Solid Content ◽  
Visual Appearance ◽  
Dried Fruit

Asam gelugur (Garcinia atroviridis Griff ex. T. Anderson) in Malaysia normally used as dried fruit for ingredients in the food. Dried G. atroviridis also used for medicinal and health benefits food. Recently, G. atroviridis become more popular when RandD found that this fruit has high hydroxy acetic acid (HCA) (to reduce cholesterol and fat, slimming agent), high antioxidant content, anti-bacteria, anti-tumour, manage high blood pressure etc. This fruit was processed as health benefit foods and also as supplement and healthy drink. This traditional plant also proven can be planted on a commercial scale and give promising income to entrepreneurs. Therefore, a study on this plant also given priority. Study on different maturity stages is important to understand the development of fruit and to determine suitable harvesting stage as a guideline for harvesting and processing. Therefore, this study were carried out by tagging the fruit from flowering until the fruit set, matured and ripen stage. From the observation, fruit at age 85 days after flowering seem started matured and they were picked at every 5 days and analysed until day 125 when fruit were overripe and drop from tree. Fruit were analysed on physical (visual appearance, firmness, lightness, chroma, hue) and chemical (pH, total titratable acidity (TTA), ascorbic acid, soluble solid content (SSC) changes. Result showed that SSC of G. atroviridis were range from 6.13 – 7.73. SSC of G. atroviridis maintain during development and significantly increased after 120 days. Acidity (TTA) of G. atroviridis were very high (3.83 – 4.60 mg/100g). TTA significantly low at day 90 and 120 after fruit set, compare to other stages. Ascorbic acid content of G. atroviridis is considered low (0.77 – 1.35 mg/100g). pH of G. atroviridis is very low at 2.41 -2.60. This considered too low compared to other fruits. pH and ascorbic acid of G. atroviridis is fluctuated during the development of fruit from 85 to 125 day after flowering. Skin lightness increased significantly from day 85 to 100, maintain until day 110 and significantly decreased until day 125. Flesh lightness maintain during fruit development. Skin chroma maintain from day 85 to day 105, significantly increased after day 105 to 110, maintain until day 115 and significantly decreased thereafter. Flesh chroma remain un-change during fruit development from day 85 to day 120, but slightly increased from day 120 to until day 125. Skin hue maintain from day 85 to day 95, significantly decreased after day 100 to 110, significantly increased until day 115 and maintain thereafter. Flesh hue remain un-change during fruit development from day 85 to day 125. Firmness of G. atroviridis maintain during development, 19.35 – 23.25 N, but significantly higher at 125 days after flowering, 25.32 N.

scholarly journals Chitosan/Cellulose Nanofibril Nanocomposite and Its Effect on Quality of Coated Strawberries

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
N. S. Resende ◽  
G. A. S. Gonçalves ◽  
K. C. Reis ◽  
G. H. D. Tonoli ◽  
E. V. B. V. Boas
Keyword(s):  
Water Vapor ◽  
Cellulose Nanofibrils ◽  
Water Vapor Permeability ◽  
Solid Content ◽  
Postharvest Quality ◽  
Vapor Permeability ◽  
Soluble Solid Content ◽  
Anthocyanin Content ◽  
Cellulose Nanofibril ◽  
Significant Difference

The aim of this study was to develop a chitosan/cellulose nanofibril (CNF) nanocomposite and evaluate its effect on strawberry’s postharvest quality after coating. From the results of color, thickness, and scanning electron microscopy (SEM) and permeability to water vapor analyses, the best film formulation for coating strawberries was determined. Three coating formulations were prepared: 1% chitosan, 1% chitosan + 3% CNF, and 1% chitosan + 5% CNF. The strawberries were immersed in the filmogenic solutions and kept under cold storage (1 ± 1°C). The color of the film was not affected by increased concentration of cellulose nanofibrils; however, the thickness and water vapor permeability were affected by the CNF addition. The coating with the highest CNF concentration performed better in reducing fruit mass and firmness loss. The color was positively influenced by the addition of the coating, regardless of formulation, as well as soluble solid content, PG enzymatic activity, and the fruit appearance. The pH and titratable acidity showed no significant difference among treatments. It was observed that the vitamin C, phenolic compounds, and anthocyanin content, as well as the PAL activity and the antioxidant activity (except for % protection), were affected by chitosan coating, however not by the addition of CNFs.

Synergistic Effects of Colour Protective Agent and Modified Atmosphere Packaging on the Preservation of Litchi (Litchi chinensis Sonn.) Fruit

2012 ◽  
Vol 535-537 ◽  
pp. 2585-2590
Author(s):  
Sheng Ping Yang ◽  
Jing Xie ◽  
Yun Fang Qian ◽  
Nian Wen Li ◽  
Xiao Liu ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Modified Atmosphere Packaging ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Solid Content ◽  
Soluble Solid Content ◽  
Modified Atmosphere ◽  
Protective Agent ◽  
Browning Index ◽  
Litchi Chinensis

The postharvest Litchi (Litchi chinensis Sonn.) fruit was treated with colour protective agent composed of 1% citric acid and 3% NaCl and stored in modified atmosphere (5%CO2/5%O2/90%N2) at (4±1)°C. The anthocycanin, moisture content and the browning index of the pericarp were investigated as factors responsible for the decline of the exterior quality, while the soluble solid content, titratable acidity and the ascorbic acid content of pulp were measured as factors responsible for the decline of the interior quality. The results showed that both the exterior quality and interior quality of Litchi fruit with postharvest treatments were better than that without any treatments. The shelf life of the samples which were dipped in the colour protective agent and packaged in modified atmosphere bags could prolong to 39 days. The good fruit rate was more than 90% with the browning index 1.52.

scholarly journals Humulus lupulus Cone Extract Efficacy in Alginate-Based Edible Coatings on the Quality and Nutraceutical Traits of Fresh-Cut Kiwifruit

Antioxidants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1395
Author(s):  
Katya Carbone ◽  
Valentina Macchioni ◽  
Greta Petrella ◽  
Daniel Oscar Cicero ◽  
Laura Micheli
Keyword(s):  
Shelf Life ◽  
Cold Storage ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Humulus Lupulus ◽  
Solid Content ◽  
Soluble Solid Content ◽  
Edible Coatings ◽  
Total Carotenoids ◽  
Fresh Cut

In this work, an innovative coating strategy that is able to prolong the shelf-life of fresh-cut kiwifruit was proposed, and the effectiveness of the procedure was evaluated for a period of ten days under cold storage (4 °C). Alginate (2% m/v) functionalized with green extracts from hop (Humulus lupulus, L.) cones (HE; 0.5 and 1%, v/v) was used as a coating material in order to assess the best performing strategy, leading to the most stable product. At the concentrations used to formulate the edible coatings, no contribution related to hop bitterness on the final product was recorded. The results were compared to control samples (without edible coating and coated only with alginate at 2% m/v). The plant extract was characterized by its main chemical traits and by 1H NMR profiling, revealing the presence of antioxidant and antimicrobial bioactive compounds (i.e., alpha and beta hop acids, xanthohumol). Furthermore, the characteristics of the samples during cold storage were evaluated by physico-chemical (i.e., weight loss, soluble solid content, titratable acidity, pH, color attributes) and nutraceutical (i.e., total polyphenol, ascorbic acid content, total carotenoids, chlorophylls) traits. The results showed that the incorporation of hop extracts into the edible coatings tested was able to preserve the quality and nutraceutical traits of fresh-cut kiwifruit during cold storage, thus prolonging their shelf life and marketability.

Ultraviolet blocking and antioxidant polyvinyl alcohol films incorporated with baicalin extraction from Scutellaria baicalensis Georgi

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jinshu Liu ◽  
Xiaoyan Ma ◽  
Wenzhao Shi ◽  
Jianwei Xing ◽  
Chaoqun Ma ◽  
...  
Keyword(s):  
Water Vapor ◽  
Polyvinyl Alcohol ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Water Vapor Permeability ◽  
Scutellaria Baicalensis ◽  
Vapor Permeability ◽  
Protective Film ◽  
Uv Blocking

Abstract Baicalin, an active flavonoid ingredient of Scutellaria baicalensis Georgi, was extracted by heat reflux extraction and showed the same significance UV absorption property with standard baicalin. Active films were prepared from polyvinyl alcohol (PVA) containing baicalin extract by casting method. The effect of baicalin extracts on the UV-blocking, optical, antioxidant property, water vapor permeability, swelling and mechanical properties of the films were studied. UV–vis transmittance spectra showed that PVA films incorporated with baicalin extract blocked ultraviolet light range from 280–400 nm even with low concentration of baicalin (0.5 wt%) and maintain the high transparency in visible spectrum. The outstanding UV-blocking properties of PVA films incorporated with baicalin extract were also confirmed by Rhodamine B degradation. Baicalin conferred antioxidant properties to PVA films as determined by DPPH radical scavenging activity. Due to the interaction between hydroxy groups of baicalin and PVA molecule, water vapor permeability, swelling and elongation at break of the films were decreased accompanied with the increasing in tensile strength and Young’s modulus. FTIR reveal that the interaction between PVA molecules was significant changed by the introduction of baicalin. These results suggest that PVA film incorporated with baicalin extract can be used for the development of functional protective film.

scholarly journals Development of PE/PCL Bilayer Films Modified with Casein and Aluminum Oxide

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3090
Author(s):  
Anita Ptiček Siročić ◽  
Ana Rešček ◽  
Zvonimir Katančić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Water Vapor ◽  
Aluminum Oxide ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Mechanical And Thermal Properties ◽  
Oxide Compound ◽  
Bilayer Films ◽  
Oxide Particles

The studied samples were prepared from polyethylene (PE) polymer which was coated with modified polycaprolactone (PCL) film in order to obtain bilayer films. Thin PCL film was modified with casein/aluminum oxide compound to enhance vapor permeability as well as mechanical and thermal properties of PE/PCL films. Casein/aluminum oxide modifiers were used in order to achieve some functional properties of polymer film that can be used in various applications, e.g., reduction of water vapor permeability (WVTR) and good mechanical and thermal properties. Significant improvement was observed in mechanical properties, especially in tensile strength as well as in water vapor values. Samples prepared with aluminum oxide particles indicated significantly lower values up to 60%, and samples that were prepared with casein and 5% Al2O3 showed the lowest WVTR value.

scholarly journals Effect of Cross-Linked Alginate/Oil Nanoemulsion Coating on Cracking and Quality Parameters of Sweet Cherries

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 449
Author(s):  
Camilo Gutiérrez-Jara ◽  
Cristina Bilbao-Sainz ◽  
Tara McHugh ◽  
Bor-Sen Chiou ◽  
Tina Williams ◽  
...  
Keyword(s):  
Titratable Acidity ◽  
Quality Parameters ◽  
Solid Content ◽  
Postharvest Quality ◽  
Soluble Solid Content ◽  
Nutritional Values ◽  
Quality Properties ◽  
Vapor Transfer ◽  
Sweet Cherries ◽  
Soluble Solid

The cracking of sweet cherries causes significant crop losses. Sweet cherries (cv. Bing) were coated by electro-spraying with an edible nanoemulsion (NE) of alginate and soybean oil with or without a CaCl2 cross-linker to reduce cracking. Coated sweet cherries were stored at 4 °C for 28 d. The barrier and fruit quality properties and nutritional values of the coated cherries were evaluated and compared with those of uncoated sweet cherries. Sweet cherries coated with NE + CaCl2 increased cracking tolerance by 53% and increased firmness. However, coated sweet cherries exhibited a 10% increase in water loss after 28 d due to decreased resistance to water vapor transfer. Coated sweet cherries showed a higher soluble solid content, titratable acidity, antioxidant capacity, and total soluble phenolic content compared with uncoated sweet cherries. Therefore, the use of the NE + CaCl2 coating on sweet cherries can help reduce cracking and maintain their postharvest quality.

scholarly journals The Mater-Bi® biodegradable film for strawberry (Fragaria x ananassa Duch.) mulching: effects on fruit yield and quality

2016 ◽  
Vol 11 (3) ◽  
pp. 203 ◽  
Author(s):  
Luigi Morra ◽  
Maurizio Bilotto ◽  
Domenico Cerrato ◽  
Raffaella Coppola ◽  
Vincenzo Leone ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Titratable Acidity ◽  
Solid Content ◽  
Soluble Solid Content ◽  
Chemical Parameters ◽  
Biodegradable Film ◽  
Yield And Quality ◽  
Physical Chemical ◽  
Soluble Solid

Two trials in different agricultural farms were carried out from October 2014 to June 2015 with the aim to assess the advantages linked to the substitution of the low density polyethylene (LDPE) films for soil mulching with the Mater-Bi<sup>®</sup> biodegradable films in the strawberry cultivation under tunnel in Campania. Lifetime of biodegradable mulch and influence of type of mulch on the yield and the quality of cvs Sabrina and Fortuna were evaluated. Plants were cultivated on mulched, raised beds, high 40 cm from bottom soil. Mater-Bi<sup>®</sup> film was 20 <span>µ</span>m thick while LDPE film was 50 mm thick. The physical-chemical parameters (firmness, pH, total soluble solid content, titratable acidity and skin colour) and some bioactive compounds (total polyphenols, flavonoids, anthocyanins, antioxidant activity) of fruits were determined by three samplings effected in consecutive months (from March to May 2015) of the harvest cycle. Biodegradable film guaranteed an effective mulch along the whole strawberry cycle (9-10 months including the time of drawing up of film). Yields of cv Sabrina on LDPE was 18% higher than those on Mater-Bi<sup>®</sup> while the opposite was detected in cv Fortuna (+10%). The physical-chemical parameters of fruits were not modified by the mulches. The content of the bioactive compounds, instead, resulted, in each time of sampling, significantly higher in fruits picked on Mater-Bi<sup>®</sup> based film.

scholarly journals Evaluation of production conditions of tomato grafted with different tobacco rootstocks and determining nicotine content and quality of fruit

2020 ◽  
Vol 115 (2) ◽  
pp. 297
Author(s):  
Seda TUNÇAY ÇAĞATAY ◽  
Gülşah ÇALIK KOÇ ◽  
Fereshteh REZAEİ ◽  
Özlem DARCANSOY İŞERI ◽  
Feride İffet ŞAHIN ◽  
...  
Keyword(s):  
Fruit Size ◽  
Titratable Acidity ◽  
Solid Content ◽  
Soluble Solid Content ◽  
Quality Factors ◽  
Nicotine Content ◽  
Positive Effects ◽  
Tomato Yield ◽  
Significant Difference ◽  
Soluble Solid

<p>This study aimed to investigate the effects of grafting tomato on different tobacco rootstocks on quality factors and nicotine content. The commercial variety (Solanum lycopersicum ‘H2274’) (BIOTECH) of the tomato was used as the scion plant, and six different tobacco (Nicotiana tabacum L.) rootstocks were used: Taşova, Tekel, Muş, Samsun, Dişbudak, Hasankeyf cultivars. Cleft grafting method was used in all plants. Yield of non-grafted and grafted plants grown in open-field conditions was calculated, and there was a significant increase in yield in grafted tomatoes compared to non-grafted tomatoes. There was significantly increased lycopene and β-carotene levels (mg kg-1), especially in ‘Tekel’, ‘Taşova’, ‘Samsun’, and ‘Hasankeyf’ tobacco grafts. There was a statistically significant difference between grafted and non-grafted plants according to 2, 2-diphenyl-1-picrylhydrazyl (DPPH) free radical retention capacities and total phenol (TP) values. Evaluation of quality determinants including pH values, titratable acidity values (citric acid %), soluble solid content (SSC)(oBrix) , fruit size ratios, showed that tomatoes grafted with ‘Muş’ tobacco rootstock were of higher quality. There was no significant difference between grafted and non-grafted plants according to nicotine analysis of the tobacco-grafted tomatoes, and due to acceptable ranges of nicotin level on tobacco grafted tomato plants were considered to be suitable for consumption. It could be concluded that grafting practices have significantly positive effects on tomato yield and quality.<br /><br /></p>

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