The potential application of supercritical CO2 in microbial inactivation of food raw materials and products

2021 ◽  
pp. 1-14
Author(s):  
Bogusław Buszewski ◽  
Olga Wrona ◽  
Razgonova P. Mayya ◽  
Alexander Mikhailovich Zakharenko ◽  
Tatyana Kuzminichna Kalenik ◽  
...  
Keyword(s):  
Potential Application ◽  
Supercritical Co2 ◽  
Raw Materials ◽  
Microbial Inactivation

scholarly journals PRODUCTION OF EXTRACTS FROM VEGETABLE RAW MATERIALS BY CARBON DIOXIDE

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
K. Gafurov ◽  
B. Muhammadiev ◽  
Sh. Mirzaeva ◽  
F. Kuldosheva
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Co2 ◽  
Raw Materials ◽  
Maximum Yield ◽  
Volumetric Flow Rate ◽  
Extraction Process ◽  
Raw Material ◽  
Critical Conditions ◽  
Plant Materials ◽  
Laboratory Setup

The unique properties of supercritical carbon dioxide as a solvent are widely used for extraction. In supercritical media, the dissolution of molecules of various chemical nature is possible. The purpose of this investigation was to study the extraction process and obtain extracts from valuable regional plant materials by applying CO2 extraction under pre- and supercritical conditions. The objects of research were: ground seeds of melon, pumpkin and licorice roots, as well as mint leaves, mulberry and jida flowers. For extraction, a laboratory setup was used that allows extraction when the CO2 is supplied by a high-pressure plunger pump in the sub- and supercritical state using a heat pump. The pressure range is 3-15 MPa, temperatures 295–330 K, and the volumetric flow rate above the critical CO2 is 800–900 g. Experiments with ground seeds of melon and pumpkin showed that as a result of 4 sequentially performed extraction cycles on a single load with supercritical CO2 parameters ( 315–330 K; 3–7.5 MPa) the decrease in the mass of melon seeds was 90 g (pumpkins 80 g). During the total extraction time (2.5 hours), 20 kg of CO2 were pumped through the reactor (25 l at 290 K and 6.8 MPa), while the average oil content in the extract was 4 g per 1 kg of CO2 (3.0 g per 1 l of SС-CO2) In experiments with jida flowers, the maximum amount of solid extractable substance (2% by weight of the raw material) was obtained at a temperature in the extractor of 308 K and a pressure of 7.5 MPa. Upon extraction under critical conditions in collection 2, the liquid phase was absent; only a yellow-green paste was released in it. According to the results of experiments with mint leaves, the maximum yield of a greenish liquid was observed at T = 315 K and P = 4 MPa., Mulberry - at T = 306 K and P = 6.0 MPa. The results of the extraction of oils and extracts from ground seeds of melon, pumpkin and licorice roots, as well as mint leaves, mulberries and jida flowers confirm that the maximum yield of the extracted substance is achieved with supercritical CO2 parameters in the extractor (310 K, 7.5 MPa). When liquid CO2 is extracted (300 K and 6-8 MPa), up to 2% of a yellow substance is extracted, which does not differ in appearance from a supercritical extract.

Anti-Ultraviolet and Anti-Bacterial Finish of Bamboo Pulp Fabric Treated by HBP-NH2

2011 ◽  
Vol 175-176 ◽  
pp. 598-601 ◽  
Author(s):  
Peng Zhang ◽  
Hong Lin ◽  
Yu Yue Chen
Keyword(s):  
Potential Application ◽  
Textile Industry ◽  
Raw Materials ◽  
Antibacterial Properties ◽  
Pulp Fibers ◽  
Environment Friendly ◽  
Branched Polymer ◽  
Energy And Environment ◽  
Bamboo Pulp ◽  
Bamboo Pulp Fabric

Bamboo pulp fibers, made of fast grown bamboo, were the recycled and environment-friendly natural raw materials in the textile industry which particularly today was paid more attention to its good performance due to energy and environment crisis. Hyper branched polymer was attracted more study because of the vast potential application in the future. In this study, the fabrics were modified with the amino-terminated hyper branched polymer (HBP-NH2) by dipping method and anti-UV and anti-bacterial properties of the treated bamboo pulp fabric were investigated. The results showed that the treated bamboo fabric had good antibacterial properties, the bacteria reduction of S.aureus and E.coli were as high as 89% or more, and also remained at around 88% after 20 times washing. The UPF values were increased from 8.16 to 18.18 which improved the anti-UV property of bamboo fabric.

Mössbauer studies of raw materials from Misti volcano of Arequipa (Peru) for its potential application in the ceramic field

2009 ◽  
Vol 190 (1-3) ◽  
pp. 115-119
Author(s):  
Angel Bustamante ◽  
Francisco Capel ◽  
Flora Barba ◽  
Pío Callejas ◽  
Rivalino Guzmán ◽  
...  
Keyword(s):  
Potential Application ◽  
Raw Materials ◽  
Mössbauer Studies

scholarly journals Supercritical CO2 drying of food matrices

2018 ◽  
Author(s):  
S. Spilimbergo ◽  
A. Zambon ◽  
T. M. Vizzotto ◽  
G. Morbiato ◽  
M. Toffoletto ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Supercritical Drying ◽  
Microbial Inactivation ◽  
Process Conditions ◽  
Drying Methods ◽  
Drying Process ◽  
Promising Alternative ◽  
Supercritical Co2 Drying ◽  
Conventional Drying ◽  
Drying Efficiency

This work explore the use of supercritical CO2 drying as alternative technique for the obtainment of pasteurized and high quality dried product. Several tests were conducted on animal, vegetable and fruit matrixes in order to investigate the effectiveness of SC-CO2 drying process at different process conditions. Design of experiment was performed to find the optimal process conditions for vegetable and fruit matrices, using the final water activity of the products as key indicator for the drying efficiency. The inactivation of naturally present microorganisms and inoculated pathogens demonstrated the capability of SC-CO2 drying process to assure a safe product. Moreover, retention of nutrients was compared with conventional drying methods. Results suggest that supercritical drying is a promising alternative technology for food drying. Keywords: supercritical drying; carbon dioxide; food drying; microbial inactivation

scholarly journals A COMPARATIVE STUDY OF CELLULOSE NANOWHISKERS (CNWs) AND CELLULOSE NANOFIBERS (CNFs)

2021 ◽  
Vol 55 (5-6) ◽  
pp. 501-510
Author(s):  
ZHIJUN HU ◽  
XINYU CAO ◽  
DALIANG GUO ◽  
YINCHAO XU ◽  
PING WU ◽  
...  
Keyword(s):  
Reaction Time ◽  
Comparative Study ◽  
Supercritical Co2 ◽  
Plant Biomass ◽  
Raw Materials ◽  
Cellulose Nanofibers ◽  
Raw Material ◽  
Cellulose Nanowhiskers ◽  
Sem Images ◽  
Economic Output

Cellulose nanowhiskers (CNWs) from plant biomass are of considerable interest, primarily due to their low density, biodegradability, mechanical strength, economic output, and renewability. Here, a new pretreatment method has been developed to produce CNWs based on supercritical CO2 and ethanol. The raw material was micro-fibrillated cellulose (MFC) and experimental factors were controlled to enhance the properties of CNWs produced using a ball-milling technique following supercritical CO2 pretreatment. Cellulose nanofibers (CNFs) were also prepared using a high-pressure Microfluidizer©. A comparative study was conducted of the properties of the raw materials, the CNWs and the CNFs. The solid yields of P-MFC after supercritical CO2 pretreatment gradually decreased, along with the temperature and the reaction time. Scanning electron microscopy (SEM) images of the CNWs and CNFs show that the morphology of the CNWs was basically acicular, while that of the CNFs was mainly soft fibrous. Thermogravimetric analysis results suggest that the thermal stability of the CNWs was substantially higher than those of the CNFs and the raw material. XRD results indicate that the crystallinity showed an initial increasing trend and then declined with increasing temperature and reaction time, and the crystallinity value of CNWs was higher than that of CNFs. The smaller CNWs became rougher and had a larger surface area.

Atom-economical synthesis of ZnO@ZIF-8 core–shell heterostructure by dry gel conversion (DGC) method for enhanced H2 sensing selectivity

2020 ◽  
Vol 8 (8) ◽  
pp. 2927-2936 ◽  
Author(s):  
Peng Ji ◽  
Xuefeng Hu ◽  
Renbing Tian ◽  
Hua Zheng ◽  
Jinghua Sun ◽  
...  
Keyword(s):  
Potential Application ◽  
Raw Materials ◽  
Core Shell ◽  
Dry Gel Conversion

ZnO@ZIF-8 was synthesized by dry gel conversion (DGC) method, which is a green atom-economical synthesis with very small amount of raw materials. As-synthesized ZnO@ZIF-8 showed potential application as a selective H2 detector over toluene.

scholarly journals COMBINED MOBILE SUPER CRITICAL CO2 EXTRACTION PLANT

2021 ◽  
Vol 6 (4(37)) ◽  
pp. 16-23
Author(s):  
V. Gurin ◽  
V. Kuts ◽  
S. Maloshtan ◽  
V. Barkholenko ◽  
O. Kashuba ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Raw Materials ◽  
Processing Plant ◽  
Storage Tanks ◽  
Supercritical Co2 Extraction ◽  
Plant Raw Materials ◽  
Complete Set ◽  
Loading And Unloading ◽  
Improved Design ◽  
New Generation

A detailed description of an experimental mobile installation of a new generation, its complete set and the possibilities of supercritical CO2-extraction for processing plant raw materials are presented. New engineering solutions in the operation of a mechanical system were demonstrated, including an improved design of a high gas pressure throttle valve installed in storage tanks and innovations in the system for loading and unloading raw materials using removable nozzles. The operating parameters of the functional elements and their resource are indicated.

scholarly journals Microbial inactivation in lipid emulsions using supercritical CO2 assisted by high power ultrasound

2019 ◽  
Author(s):  
Angela Gomez-Gomez ◽  
Edmundo Brito-de la Fuente ◽  
Crispulo Gallegos ◽  
Jose Vicente Garcia-Perez ◽  
Jose Benedito
Keyword(s):  
High Power ◽  
Supercritical Co2 ◽  
Microbial Inactivation ◽  
Lipid Emulsions ◽  
Power Ultrasound ◽  
High Power Ultrasound

scholarly journals Fabrication and Investigation of 26NCA Films Exhibiting Tunable Blue Fluorescence Based on LVPVDM

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Yufeng Ding ◽  
Liangliang Pan ◽  
Siqi Li ◽  
Huimei He ◽  
Dapeng Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Potential Application ◽  
Physical Vapor Deposition ◽  
Large Scale ◽  
High Efficiency ◽  
Raw Materials ◽  
Molecular Systems ◽  
Physical Vapor Deposition Method ◽  
New Strategy ◽  
Shoulder Peak

The development of metallic fluorescent materials, π-conjugated molecular systems with high-efficiency generation of blue light, and new ways to fabricate metallic/organic luminescent materials plays an important role in the fields of large-scale flat panel displays and soft optical devices. Herein, different fluorescent films have been fabricated by low vacuum physical vapor deposition method (LVPVDM), including single/two-component films. Compared with raw materials, all films show novel fluorescent behaviors, which means potential application in the fields of multicolor luminescence and thickness-optical response sensors. Meanwhile, the speculation is demonstrated in many ways that the maximum emission (λemmax) at 406 nm and 426 nm of pristine 2,6-naphthalenedicarboxylic acid (26NCA) is caused by the crystal structure, while the shoulder peak at 445 nm is caused by the self-structure of 26NCA molecule. Significantly, this speculation may afford new insight into the relationship between not only crystal structure and luminescence, but also molecular self-structure and luminescence, which means a new strategy to tune the fluorescent behaviors based on molecular self-structure by LVPVDM. Therefore, this work provides a facile way to fabricate single/multicomponent metallic/organic film materials with tunable blue luminescence properties, which have potential application in the fields of next generation of photofunctional materials.

Sign in / Sign up

Export Citation Format

Share Document