Optimization for Ultra High Pressure Isomerization of Lycopene

2013 ◽  
Vol 781-784 ◽  
pp. 1430-1433 ◽  
Author(s):  
Wei Zong ◽  
Yi Heng Cao ◽  
Si Qun Jing ◽  
Hui Shi ◽  
Guang Yuan Zhao
Keyword(s):  
High Pressure ◽  
Orthogonal Test ◽  
Holding Time ◽  
Single Factor ◽  
Ultra High Pressure

To isomerizate of lycopene by ultra high pressure (UHP) method, based on single factor experiments, orthogonal test was used to optimum the isomerization conditions. UHP pressure, UHP holding time, temperature were as factors and ratio of cis-lycopene in total lycopene was as index. The results were as follows: 50°C, UHP pressure 500MPa and holding time 7min. The ratio of cis-lycopene in total lycopene was 45.1%. So UHP combine heating has a isomerization effect on lycopene.

Effects of Ultra High Pressure on Bay Scallop (Aequipecten irradians) Adductor Muscles

2005 ◽  
Vol 11 (6) ◽  
pp. 477-484 ◽  
Author(s):  
M. Pérez-Won ◽  
G. Tabilo-Munizaga ◽  
G. V. Barbosa-Cánovas
Keyword(s):  
High Pressure ◽  
Oscillation Mode ◽  
Physicochemical Characteristics ◽  
Honeycomb Structure ◽  
Holding Time ◽  
Plate Count ◽  
Bay Scallops ◽  
Ultra High Pressure ◽  
Total Plate Count ◽  
Adductor Muscles

The aim of this study was to evaluate the effects of ultra high pressure (UHP) on the adductor muscles of bay scallops ( Aequipecten irradians) pertaining to certain physicochemical characteristics and microstructure. UHP treatment was applied at 200MPa and 400MPa, each application with one pulse and a holding time of 10min, or 2 pulses and a holding time of 5min per pulse, in a continuous or oscillation mode. Determination of textural parameters and L*, a* and b* colour parameters were carried out and compared with untreated scallops. Microstructure was observed using a scanning electronic microscopy (SEM) technique and, for microbial analyses, a total plate count was performed. SEM showed that UHP treatments induced a size reduction of the honeycomb structure of myofibres, giving a more compact appearance to the structure. Colour and compressibility enhanced by pressure treatment, however loss of hardness was observed. UHP treatments also reduced the initial load in total plate count of microorganisms to 10cfu/g. UHP is a competitive technology in food processing and ready for use on this high-priced seafood product.

Optimization of Ultra-High Pressure Extraction Process of Polysaccharides from Dendrobium Candidum by Response Surface Method

2012 ◽  
Vol 550-553 ◽  
pp. 1796-1800 ◽  
Author(s):  
Xue Tao ◽  
Yao Zhan ◽  
Qiu Yan Zhou ◽  
Feng Qin Feng ◽  
Yong Yu
Keyword(s):  
High Pressure ◽  
Response Surface ◽  
Response Surface Method ◽  
Extraction Process ◽  
Holding Time ◽  
Solid Ratio ◽  
Ultra High Pressure ◽  
Surface Method ◽  
Pressure Extraction ◽  
Dendrobium Candidum

Ultra-high pressure extraction technique was used to extract polysaccharides from Dendrobium candidum. Extraction pressure, pressure holding time and liquid-solid ratio were found to have a significant influence on the polysaccharides extraction and were optimized by the response surface method (RSM). The obtained optimum conditions were: extraction pressure 445.28MPa, pressure holding time 6.7 minutes and liquid-solid ratio 237.91ml/g. The maximum polysaccharide yield could reach 596.75mg/g under these conditions. The ultra-high pressure extraction process was a suitable method for its higher yield and shorter extraction time compared to the water-heating extraction.

scholarly journals Trans-lithospheric diapirism explains the presence of ultra-high pressure rocks in the European Variscides

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Petra Maierová ◽  
Karel Schulmann ◽  
Pavla Štípská ◽  
Taras Gerya ◽  
Ondrej Lexa
Keyword(s):  
High Pressure ◽  
Numerical Models ◽  
Classical Concept ◽  
Plate Interface ◽  
Ultra High Pressure ◽  
Common Process ◽  
Mountain Belts ◽  
Collisional Orogens ◽  
Rock Association ◽  
European Variscides

AbstractThe classical concept of collisional orogens suggests that mountain belts form as a crustal wedge between the downgoing and overriding plates. However, this orogenic style is not compatible with the presence of (ultra-)high pressure crustal and mantle rocks far from the plate interface in the Bohemian Massif of Central Europe. Here we use a comparison between geological observations and thermo-mechanical numerical models to explain their formation. We suggest that continental crust was first deeply subducted, then flowed laterally underneath the lithosphere and eventually rose in the form of large partially molten trans-lithospheric diapirs. We further show that trans-lithospheric diapirism produces a specific rock association of (ultra-)high pressure crustal and mantle rocks and ultra-potassic magmas that alternates with the less metamorphosed rocks of the upper plate. Similar rock associations have been described in other convergent zones, both modern and ancient. We speculate that trans-lithospheric diapirism could be a common process.

scholarly journals Advances in ultra‐high‐pressure and multi‐dimensional liquid chromatography instrumentation and workflows

2021 ◽  
Author(s):  
Jelle De Vos ◽  
Dwight Stoll ◽  
Stephan Buckenmaier ◽  
Sebastiaan Eeltink ◽  
James P. Grinias
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Ultra High Pressure
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