Improvement of Shelf Life and Postharvest Quality of White Button Mushroom by Electron Beam Irradiation

The microbiological safety, refrigeration shelf-life, and nutritional quality of chicken breast meat were investigated following combined electron-beam irradiation and cooking under vacuum (sous-vide). Chicken breast meat inoculated with 106 CFU/g of Listeria monocytogenes was irradiated with an electron beam at doses up to 3.1 kGy under vacuum in barrier bags, cooked in a boiling water bath for 3 min 45 s (previously determined to achieve an internal temperature of 71.1°C), and stored at 8°C for up to 5 weeks. Listeria was undetectable in samples treated with combined sous-vide and irradiation at 3.1 kGy, but the organism survived the sous-vide treatment without irradiation and multiplied during storage. A similar study, conducted with uninoculated chicken breast meat, revealed that the product which received both irradiation (3 kGy) and sous-vide treatment had a shelf-life of at least 8 weeks at 8°C, whereas the unirradiated samples treated sous-vide spoiled in 16 days. Listeria was undetectable in combination treated samples, but some of the unirradiated sous-vide samples tested after long storage showed high levels of Listeria. Some loss of thiamine occurred with the combined treatments.

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Postharvest Quality of Cut Roses Following Electron-beam Irradiation

HortScience ◽

10.21273/hortsci.32.4.698 ◽

1997 ◽

Vol 32 (4) ◽

pp. 698-701 ◽

Cited By ~ 8

Author(s):

Ai-Yu Chang ◽

Richard J. Gladon ◽

Mark L. Gleason ◽

Sharon K. Parker ◽

Nancy H. Agnew ◽

...

Keyword(s):

Electron Beam ◽

Electron Beam Irradiation ◽

Postharvest Quality ◽

Beam Irradiation ◽

Flower Bud ◽

Injury Threshold ◽

Postharvest Life ◽

Bud Opening ◽

Fourth Experiment

Cut Rosa ×hybrida L. `Royalty' flowers were used to determine the efficacy of electron-beam irradiation for increasing postharvest quality and decreasing petal infection by Botrytis cinerea Pers. In an experiment for determining the injury threshold, roses received electron-beam irradiation of 0, 0.5, 1, 2, and 4 kGy. Irradiation dosages ≥1 kGy caused necrosis on petal tissue and decreased postharvest life at 20 °C. In a second experiment to evaluate postharvest quality, roses were irradiated at 0, 0.25, 0.5, 0.75, and 1 kGy. Dosages of 0.25 and 0.5 kGy slowed the rate of flower bud opening for 2 days but did not decrease postharvest quality when compared with nonirradiated roses. Roses that received irradiation dosages of 0.75 and 1 kGy showed unacceptable quality. In a third experiment, roses that had or had not been inoculated with B. cinerea were irradiated at 0, 0.25, 0.5, and 0.75 kGy. Irradiation did not control B. cinerea populations, and rose quality decreased as dosage increased. In a fourth experiment to determine the effect of irradiation on B. cinerea, conidia on water-agar plates exposed to dosages ≤1, 2, and 4 kGy germinated at rates of ≈90%, 33%, and 2%, respectively, within 24 h.

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Methods to Monitor and Improve the Performance of Specimen Holders for Transmission Electron Cryomicroscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100164738 ◽

1996 ◽

Vol 54 ◽

pp. 454-455

Author(s):

B. L. Armbruster ◽

B. Kraus ◽

M. Pan

Keyword(s):

Electron Microscopy ◽

Electron Beam ◽

Electron Beam Irradiation ◽

Beam Irradiation ◽

Quality Of Data ◽

Electron Cryomicroscopy ◽

Thermal Equilibration ◽

Transmission Electron ◽

Electron Microscopes

One goal in electron microscopy of biological specimens is to improve the quality of data to equal the resolution capabilities of modem transmission electron microscopes. Radiation damage and beam- induced movement caused by charging of the sample, low image contrast at high resolution, and sensitivity to external vibration and drift in side entry specimen holders limit the effective resolution one can achieve. Several methods have been developed to address these limitations: cryomethods are widely employed to preserve and stabilize specimens against some of the adverse effects of the vacuum and electron beam irradiation, spot-scan imaging reduces charging and associated beam-induced movement, and energy-filtered imaging removes the “fog” caused by inelastic scattering of electrons which is particularly pronounced in thick specimens.Although most cryoholders can easily achieve a 3.4Å resolution specification, information perpendicular to the goniometer axis may be degraded due to vibration. Absolute drift after mechanical and thermal equilibration as well as drift after movement of a holder may cause loss of resolution in any direction.

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The effect of Combined Treatment with Sodium Dichloroisocyanurate and Electron Beam Irradiation in Controlling Mold (Lasiodiplodia theobromae) on Star Apples

Nuclear Science and Technology ◽

10.53747/jnst.v7i3.103 ◽

2021 ◽

Vol 7 (3) ◽

pp. 42-51

Author(s):

Thi Ly Nguyen ◽

Thi The Doan ◽

Phuong Anh Pham Nguyen ◽

Van Chung Cao ◽

Anh Tuyet Dinh Thi ◽

...

Keyword(s):

Electron Beam ◽

Shelf Life ◽

Irradiation Dose ◽

Electron Beam Irradiation ◽

Combined Treatment ◽

Lasiodiplodia Theobromae ◽

Sodium Dichloroisocyanurate ◽

And Storage ◽

Apple Fruits

Lasiodiplodia theobromae causes decay of star apple fruits (Chrysophyllum cainino) during harvest, transport and storage. If the irradiation dose is higher than 800 Gy, this mold will be controlled. However, the quality of star apple was significantly changed when they were irradiated at the dose higher than 0.6 kGy by electron beam (EB). To keep irradiation dose under 0.6kGy, the synergic effect of the combined treatment of EB irradiation and sodium dichloroisocyanurate (NaDCC) was investigated. In this study, star apples were pretreated with NaDCC concentrations in range of 10 -70 ppm in order to decrease the growth of mold and extend the shelf-life of treated star apples. The results showed that pretreatment with 20 ppm NaDCC had also kept the color and reduced disease of stored star apple. Dipping star apples into 20 ppm NaDCC solution before irradiating at 400 Gy and 600 Gy could be chosen as the best way to inhibit the development of Lasiodiplodia theobromae and extend the shelf life of star apple in the trading condition (7 days, 9oC).

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