Use of Vacuum Impregnation in Smoked Salmon Manufacturing

The microstructure of polyacrylonitrile (PAN) beads for affinity chromatography bioseparations was studied by TEM of stained ultramicrotomed thin-sections. Microstructural aspects such as overall pore size distribution, the distribution of pores within the beads, and surface coverage of functionalized beads affect performance properties. Stereological methods are used to quantify the internal structure of these chromatographic supports. Details of the process for making the PAN beads are given elsewhere. TEM specimens were obtained by vacuum impregnation with a low-viscosity epoxy and sectioning with a diamond knife. The beads can be observed unstained. However, different surface functionalities can be made evident by selective staining. Amide surface coverage was studied by staining in vapor of a 0.5.% RuO4 aqueous solution for 1 h. RuO4 does not stain PAN but stains, amongst many others, polymers containing an amide moiety.

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The Effect of γ-Al2O3, TiO2 and ZrO2 Supports on Hydrodesulfurization Activity of Transition-Metal Sulfides

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20080945 ◽

2008 ◽

Vol 73 (8-9) ◽

pp. 945-955 ◽

Cited By ~ 6

Author(s):

Luděk Kaluža ◽

Miroslav Zdražil

Keyword(s):

Transition Metal ◽

Aqueous Solutions ◽

Model Reaction ◽

Metal Sulfides ◽

Vacuum Impregnation ◽

Transition Metal Sulfides ◽

Highly Active ◽

System A ◽

Benzothiophene Hydrodesulfurization ◽

Hydrodesulfurization Activity

The transition metals V, Cr, Mn, Fe, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir and Pt were deposited from aqueous solutions of their salts onto conventional γ-Al2O3 and unconventional TiO2 and ZrO2 supports by vacuum impregnation and characterized in their sulfided form by a model reaction of benzothiophene hydrodesulfurization. It was found that the TiO2 and ZrO2 supports influenced predominantly positively the resulting activity of relatively low-active metals (V, Cr, Mn, Fe, Co, Ni, Mo, Ru, W and Os), whereas the highly active metals (Rh, Pd, Ir, Pt and Re) were influenced slightly negatively or not at all by those supports compared with the γ-Al2O3-supported system. A significant effect of the supports on the hydrodesulfurization-activity ranking of the transition-metal sulfides studied was ascertained.

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Bacterial surface, biofilm and virulence properties of Listeria monocytogenes strains isolated from smoked salmon and fish food contact surfaces

Food Bioscience ◽

10.1016/j.fbio.2021.101021 ◽

2021 ◽

pp. 101021

Author(s):

Mert Sudagidan ◽

Veli Cengiz Ozalp ◽

Orhan Öztürk ◽

Mediha Nur Zafer Yurt ◽

Orhan Yavuz ◽

...

Keyword(s):

Listeria Monocytogenes ◽

Fish Food ◽

Bacterial Surface ◽

Food Contact ◽

Food Contact Surfaces ◽

Smoked Salmon ◽

Contact Surfaces ◽

Virulence Properties

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Antioxidant and Cryoprotective Effects of Bone Hydrolysates from Bighead Carp (Aristichthys nobilis) in Freeze-Thawed Fish Fillets

Foods ◽

10.3390/foods10061409 ◽

2021 ◽

Vol 10 (6) ◽

pp. 1409

Author(s):

Yiqi Zhang ◽

Ye Dong ◽

Zhiyuan Dai

Keyword(s):

Antioxidant Activity ◽

Thiobarbituric Acid ◽

Fish Bone ◽

Bighead Carp ◽

Vacuum Impregnation ◽

Ferrous Ions ◽

Freezing And Thawing ◽

Aristichthys Nobilis ◽

Fish Fillets

Bone hydrolysates from bighead carp (Aristichthys nobilis) were prepared using Protamex and Alcalase with degrees of hydrolysis (DH) of 5%, 10% and 15%. The antioxidant activity of bone hydrolysates was evaluated in vitro and then the hydrolysates with better antioxidant activity were used to immerse bighead carp fillets through a vacuum impregnation process at concentrations of 1% and 2%. Among the six hydrolysates, fish bone hydrolyzed with Protamex at DH 10% exhibited the highest ability to scavenge 1, 1-diphenyl-2-picrylhydrazyl (DPPH) (88.79%), 2, 2′-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) (57.76%) and hydroxyl radicals (62.72%), as well as to chelate ferrous ions (91.46%). The hydrolysates effectively postponed freezing- and thawing-induced protein/lipid oxidation. Compared with the fillets without treatment, the impregnated fillets had higher sulfhydryl contents, greater Ca2+-ATPase activity, lower carbonyls and lower thiobarbituric acid-reactive substances (TBARS). Bone hydrolysates also have a positive effect on the texture and water-holding ability of freeze-thawed fish fillets. Fish bone hydrolysates of Protamex could serve as potential antioxidants to preserve fish fillets.

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Fast Preparation of High-Performance Wood Materials Assisted by Ultrasonic and Vacuum Impregnation

Forests ◽

10.3390/f12050567 ◽

2021 ◽

Vol 12 (5) ◽

pp. 567

Author(s):

Hong Yang ◽

Mingyu Gao ◽

Jinxin Wang ◽

Hongbo Mu ◽

Dawei Qi

Keyword(s):

Mechanical Properties ◽

High Performance ◽

Mechanical Tests ◽

Vacuum Impregnation ◽

Natural Forests ◽

Ultrasonic Pretreatment ◽

Fast Growing ◽

Before And After ◽

New Material ◽

Ft Ir

In the absence of high-quality hardwood timber resources, we have gradually turned our attention from natural forests to planted fast-growing forests. However, fast-growing tree timber in general has defects such as low wood density, loose texture, and poor mechanical properties. Therefore, improving the performance of wood through efficient and rapid technological processes and increasing the utilization of inferior wood is a good way to extend the use of wood. Densification of wood increases the strength of low-density wood and extends the range of applications for wood and wood-derived products. In this paper, the effects of ultrasonic and vacuum pretreatment on the properties of high-performance wood were explored by combining sonication, vacuum impregnation, chemical softening, and thermomechanical treatments to densify the wood; then, the changes in the chemical composition, microstructure, and mechanical properties of poplar wood before and after treatment were analyzed comparatively by FT-IR, XRD, SEM, and mechanical tests. The results showed that with ultrasonic pretreatment and vacuum impregnation, the compression ratio of high-performance wood reached its highest level and the MOR and MOE reached their maximums. With the help of this method, fast-growing softwoods can be easily prepared into dense wood materials, and it is hoped that this new material can be applied in the fields of construction, aviation, and automobile manufacturing.

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