scholarly journals Development of Active Packaging to Extend the Shelf Life of Agaricus bisporus by Using Plasma Technology

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2120
Author(s):  
Chao-Kai Chang ◽  
Kuan-Chen Cheng ◽  
Chih-Yao Hou ◽  
Yi-Shan Wu ◽  
Chang-Wei Hsieh
Keyword(s):  
Shelf Life ◽  
Polyphenol Oxidase ◽  
Agaricus Bisporus ◽  
Structural Integrity ◽  
Plasma Modification ◽  
Gas Composition ◽  
Test Results ◽  
Plasma Technology ◽  
Glucanase Activity ◽  
Browning Inhibition

In this study, a preservation package that can extend the shelf life of Agaricus bisporus was developed using plasma modification combined with low-density polyethylene (LDPE), collagen (COL), and carboxymethyl cellulose (CMC). Out results showed that the selectivity of LDPE to gas can be controlled by plasma modification combined with coating of different concentrations of CMC and COL. Packaging test results applied to A. bisporus showed that 3% and 5% of CMC and COL did not significantly inhibit polyphenol oxidase and β-1,3-glucanase, indicating no significant effect on structural integrity and oxidative browning. The use of 0.5% and 1.0% CMC and COL can effectively inhibit the polyphenol oxidase and β-1,3-glucanase activity of A. bisporus, leading to improved effects in browning inhibition and structural integrity maintenance. P-1.0COL can effectively maintain gas composition in the package (carbon dioxide: 10–15% and oxygen: 8–15%) and catalase activity during storage, thereby reducing the oxidative damage caused by respiration of A. bisporus. The current study confirmed that the use of plasma modification technology combined with 1.0% COL can be used in preservation packaging by regulating the respiration of A. bisporus, thus extending its shelf life from 7 to 21 days.

Debonding Behaviors of CFRP Strengthened RC Beams with Weak Interfaces

2013 ◽  
Vol 351-352 ◽  
pp. 587-591
Author(s):  
Sen Li ◽  
Xiao Gang Wang ◽  
Xin Gang Zhou
Keyword(s):  
Tensile Strain ◽  
Structural Integrity ◽  
Structural Performance ◽  
Rc Beams ◽  
Test Results ◽  
Weak Interface ◽  
Premature Rupture ◽  
Loading Process ◽  
Interface Effects

Debonding behaviors of CFRP strengthened RC beams were experimentally investigated under the influence of weak interfaces, which are induced either by defective bonding of replaced cover or expansive cracks. Shown by test results, weak interfaces impaired considerably the structural integrity of strengthening systems during loading, and easily led to CFRP debonding failure. U-strips worked effectively in preventing the integral debonding and guarantee the structural performance of flexural sheets. However, local cover delamination in the loading process and premature rupture of flexural CFRP could still take place due to the weak interface effects. Therefore, allowable tensile strain of flexural CFRP should be reduced, and more strict confinement and anchorage measures should be taken in this case.

Numerical simulation of fairing separation test for hypersonic air breathing vehicle

2016 ◽  
Vol 231 (2) ◽  
pp. 319-325 ◽  
Author(s):  
Ankit Raj ◽  
K Anandhanarayanan ◽  
R Krishnamurthy ◽  
Debasis Chakraborty
Keyword(s):  
Structural Integrity ◽  
Test Results ◽  
Air Breathing ◽  
Aerodynamic Loads ◽  
Pressure Distributions ◽  
Ground Test ◽  
Computational Fluid Dynamics Simulations ◽  
Euler Solver ◽  
Dynamics Simulations ◽  
Flight Hardware

Fairings are provided to cover hypersonic air breathing vehicle to protect it from adverse aerodynamic loading and kinetic heating. Separation dynamics of fairings is an important event in the launch of vehicle. Extensive computational fluid dynamics simulations are carried out for the design of fairings and vehicle and selection of time sequences of various separation events. A ground test of fairing separation is conducted in the sled facility to check the structural integrity and functionality of various separation mechanisms and flight hardware. Simulations have been carried out to study the separation dynamics of fairings at test conditions using grid-free Euler solver to get the aerodynamic loads and the loads are integrated to get the trajectory of fairings. The aerodynamic loads are provided to verify the structural integrity of various components and the trajectory of panels is used in the test planning. The pressure distributions on the vehicle are compared with the test results.

Morphological and phylogenetical analyses of pathogenic Hypomyces perniciosus isolates from Agaricus bisporus causing wet bubble disease in China

Phytotaxa ◽  
2021 ◽  
Vol 491 (2) ◽  
pp. 115-130
Author(s):  
CHUN-LAN ZHANG ◽  
ZHENG-WEN JIN ◽  
CAN SUN ◽  
ODESHNEE MOODLEY ◽  
JI-ZE XU ◽  
...  
Keyword(s):  
Phylogenetic Relationships ◽  
Agaricus Bisporus ◽  
Morphological Characteristics ◽  
Pathogenicity Test ◽  
Test Results ◽  
Phylogenetic Studies ◽  
Group Ii

Hypomyces perniciosus is a destructive pathogen of Agaricus bisporus. The disease has been known to occur wherever A. bisporus is cultivated. Morphological characteristics have shown differences between reported isolates of H. perniciosus. However, clarification is needed to determine whether those isolates are the same species and an investigation of the phylogenetic relationships among them is warranted. Here, taxonomic and phylogenetic studies were carried out on 29 wet bubble disease pathogen isolates from China. Our analyses of the morphological characteristics and phylogenetic results support that they are the same H. perniciosus. Moreover, they are separated into two groups, groups ⅰ and groups ii. Pathogenicity test results inferred that group ii had weaker pathogenicity than group ⅰ. Consequently, we can deduce that wet bubble disease is still caused by H. perniciosus and isolates from two distinct groups.

Effects of Storage Temperature and Preservative Treatment on Shelf Life of the Pond-Raised Freshwater Fish, Silver Perch (Bidyanus bidyanus)

2001 ◽  
Vol 64 (10) ◽  
pp. 1584-1591 ◽  
Author(s):  
A. GELMAN ◽  
L. GLATMAN ◽  
V. DRABKIN ◽  
S. HARPAZ
Keyword(s):  
Shelf Life ◽  
Cold Storage ◽  
Storage Temperature ◽  
Storage Period ◽  
Potassium Sorbate ◽  
Test Results ◽  
Bacterial Composition ◽  
Fish Flesh ◽  
Microbiological Characteristics ◽  
Initial Load

Sensory and microbiological characteristics of pond-raised freshwater silver perch (Bidyanus bidyanus) fish, during cold storage over a period of 25 days were evaluated. Whole fish (averaging 400 g each) were stored in cold storage rooms at either 0 to 2°C, 5°C, or 5°C + potassium sorbate as a preservative. The organoleptic and hypoxanthine test results show that the treatment of potassium sorbate can slow the process of spoilage by about 5 days. Yet, the most important factor affecting the shelf life of these fish is the storage temperature. Keeping the fish at 0 to 2°C can prolong the storage prior to spoilage by 10 days compared with those kept at 5°C. These results obtained through organoleptic tests are corroborated by both the chemical (hypoxanthine and total volatile basic nitrogen) and to some extent by the physical (cosmos) tests. The initial total bacteriological counts were 5 × 102 CFU/cm2 for fish surface and <102 CFU/g for fish flesh, and these counts rose continuously, reaching about 106 CFU/g (0 to 2°C) and 107 CFU/g (5°C) in flesh and 107 to 108 CFU/cm2 on the surface by the end of the storage period. The addition of potassium sorbate led to a smaller increase in bacterial numbers, especially during the first 15 days. Bacterial composition fluctuated during storage. The initial load on the fish surface was predominantly mesophilic and gram positive and consisted mostly (80%) of Micrococci, Bacillus, and Corynebacterium. During the next 10 days, these bacteria were practically replaced by gram-negative flora comprised mostly of Pseudomonas fluorescens that rapidly increased with storage time and accounted for 95% after 15 days.

scholarly journals PEMANFAATAN KITOSAN DARI CANGKANG RAJUNGAN (Portonus sanginolentus L.) SEBAGAI PENGAWET IKAN KEMBUNG (Rastrelliger sp) DAN IKAN LELE (Clarias Batrachus)

2015 ◽  
Vol 3 (4) ◽  
pp. 18-24
Author(s):  
Rika Silvia ◽  
Sari Wahyu Waryani ◽  
Farida Hanum
Keyword(s):  
Acetic Acid ◽  
Moisture Content ◽  
Shelf Life ◽  
Microbial Activity ◽  
Storage Time ◽  
Chitosan Solution ◽  
Ash Content ◽  
Clarias Batrachus ◽  
Test Results ◽  
Chitin And Chitosan

The use of appropriate anti-microbial compounds can extend the shelf life of a product as well as ensure the safety of the product. That requires a material that is naturally anti-microbial so as not harmful to health. The use of chitosan to inhibit microbial activity on mackerel (Rastrelliger sp) and catfish (Clarias batrachus) to test it's effectiveness. In this research chitosan that used as an anti-microbial extracted from the shells of crabs (Portunus sanginolentus L.). Chitin and chitosan that were successfully extracted were characterized it's results includes moisture content testing, ash content, and degrees of deacetylation. Characterized chitosan, were used as an anti-microbial mackerel (Rastrelliger sp) and catfish (Clarias batrachus). Chitosan was dissolved in 1% acetic acid with varying concentrations of chitosan as 1%, 1.5%, 2%, and 2.5%. The storage time of fish: 0 hours, 10 hours, 15 hours, 20 hours, and 25 hours. The results of research chitosan form as granules / powder, 5% moisture content, ash content  2% and the degree of deacetylation which amounted to 61,08%. Chitosan solution test results on fish showed that fish preservation by soaking with chitosan addition of 1.5% was the best variable and could extend the shelf life of fish  more than 5 hours while fish preservation by spraying gave the best variable with addition of chitosan 2.5% and could extend the shelf life of fish less than 5 hours.

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