scholarly journals Quantification of Glucose, Fructose and Sucrose in Apple Juices Using ATR-MIR Spectroscopy Coupled with Chemometry

1970 ◽  
Vol 66 (2) ◽  
Author(s):  
Loredana LEOPOLD ◽  
Horst DIEHL ◽  
Carmen SOCACIU
Keyword(s):  
Sucrose Concentration ◽  
Cost Effective ◽  
Average Concentration ◽  
Mir Spectroscopy ◽  
Routine Monitoring ◽  
Calibration Models ◽  
Sucrose Solutions ◽  
Sweetness Intensity ◽  
High Sucrose Concentration ◽  
Predicted Values

A combination of Fourier transform infrared spectroscopy (FTIR) and multivariate statistics (chemometry) was applied as a screening tool for the quantitative determination of carbohydrates, such as glucose, fructose and sucrose, in 11 processed commercial apple juices and 2 genuine juices obtained from squeezed apples. For calibration, a number of 24 mixtures of glucose, fructose and sucrose solutions (synthetic samples), at different concentrations were prepared and scanned in the 885 and 1500 cm-1 spectral range, using attenuated total reflectance (ATR) FTIR spectroscopy. Based on the mixtures spectra in the mid IR (MIR) region, we realized calibration models for each carbohydrate, using partial least squares (PLS) regression. The models were then used to predict the glucose, fructose and sucrose concentration in commercial apple juices, comparatively with concentrations in fresh, genuine juices, in order to assess the juice authenticity. The glucose concentrations (%, w/w) predicted for commercial juices ranged from 1.664 to 3.133 versus 3.1 for genuine fresh juices. The fructose concentrations (%, w/w) predicted for commercial juices ranged from 3.701 to 6.941 versus 9.2 for genuine fresh juices, while the sucrose concentrations (%, w/w) predicted for commercial juices ranged from 0.746 to 5.795 versus 1.38 for genuine fresh juices. The standard deviations of most predicted values are below 10%. Most juices exhibited glucose, fructose and sucrose concentrations in the expected range. However, several samples showed discrepancies from average concentration values, thus the authenticity of these juices could not be confirmed. Also, high sucrose concentration can flag adulterated juices, or indicates sucrose addition to maintain the juice sweetness intensity. Our results indicate ATR-MIR spectroscopy to be a rapid, accurate, non-destructive and cost-effective tool for routine monitoring of multiple constituents in apple juices, as quality and safety indicators.

scholarly journals Quantification of carbohydrates in fruit juices using FTIR spectroscopy and multivariate analysis

2011 ◽  
Vol 26 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Loredana F. Leopold ◽  
Nicolae Leopold ◽  
Horst-A. Diehl ◽  
Carmen Socaciu
Keyword(s):  
Ftir Spectroscopy ◽  
Multivariate Statistics ◽  
Sucrose Concentration ◽  
Principal Component ◽  
Cost Effective ◽  
Average Concentration ◽  
Fruit Juices ◽  
Routine Monitoring ◽  
Sweetness Intensity ◽  
High Sucrose Concentration

A combination of Fourier-transform infrared spectroscopy (FTIR) and multivariate statistics was applied as screening tool for the quantitative determination of carbohydrates, such as glucose, fructose and sucrose, in 28 processed commercial fruit juices and 5 genuine juices obtained from squeezed fruits. A number of 13 mixtures of glucose, fructose and sucrose standard solutions were prepared at different concentrations, scanned by attenuated total reflectance (ATR) FTIR spectroscopy and analyzed in the 900 and 1400 cm−1spectral range. Principal component analysis (PCA) of the standard carbohydrate solutions enabled a better understanding of the main sources of variability affecting the FTIR spectra. Also, PCA enabled the grouping of apple, orange and peach juices. Calibration models for each carbohydrate, using partial least squares (PLS) regression were developed and used for prediction purposes. Cross-validation procedures indicated correlations of 0.88, 0.92 and 0.98 for glucose, fructose and sucrose, respectively, between HPLC measured values and FTIR first derivative spectra estimates. Carbohydrates in the expected concentration ranges were found for most of the pure fruit labelled juices. The samples with 4–50% pure fruit juice content showed discrepancies from average concentration values of authentic juices, mainly a high sucrose concentration can flag sucrose addition to maintain the juice sweetness intensity. The present results confirmed the efficiency of FTIR spectroscopy, in combination with multivariate statistics, as a rapid, reliable and cost-effective tool for routine monitoring of multiple constituents in fruit juices, as quality indicators.

Detection of enteroviruses in marine waters by direct RT-PCR and cell culture

1995 ◽  
Vol 31 (5-6) ◽  
pp. 323-328 ◽  
Author(s):  
K. A. Reynolds ◽  
C. P. Gerba ◽  
I. L. Pepper
Keyword(s):  
Cell Culture ◽  
Polymerase Chain Reaction Amplification ◽  
Cost Effective ◽  
The United States ◽  
Water Runoff ◽  
Rt Pcr ◽  
Marine Waters ◽  
Storm Water Runoff ◽  
Routine Monitoring ◽  
Reaction Amplification

Sewage outfalls and storm water runoff introduces pathogenic human enteric viruses into marine coastal waters, which may pose a potential public health risk. Although members of the enterovirus group have been suggested as possible indicators of sewage pollution in marine waters, the lack of rapid, sensitive and cost effective methods have prevented routine monitoring in the United States. This study compared traditional cell culture and direct RT-PCR (reverse transcriptase-polymerase chain reaction) amplification for detection of an enterovirus. Poliovirus could be recovered from 100 L of artificial seawater with an average efficiency of 77%, using adsorption and elution from electronegative filters. Viruses were eluted from the filters with 1.5% beef extract for viruses (BEV) adjusted to pH 9.5 and reconcentrated by organic flocculation to a volume of 30 mL. Substances which interfered with detection by RT-PCR were removed by treatment of the concentrates with sephadex and chelex resins. Direct RT-PCR could detect 2.5 and 0.025 PFU (plaque forming units) for single (25 cycles) and double PCR (2 × 25 cycles) in 10 μL of pure culture poliovirus samples, respectively. These methods are currently being applied to assess the occurrence of enteroviruses at marine bathing beaches influenced by sewage discharges.

Monitoring effluent quality in hypertrophic wastewater reservoirs using remote sensing

1996 ◽  
Vol 33 (8) ◽  
pp. 23-29 ◽  
Author(s):  
I. Dor ◽  
N. Ben-Yosef
Keyword(s):  
Water Quality ◽  
Theoretical Model ◽  
Principal Component ◽  
Cost Effective ◽  
Operational Parameters ◽  
Effluent Quality ◽  
Optical Images ◽  
Routine Monitoring ◽  
Cost Effective Method ◽  
Wastewater Quality

About one hundred and fifty wastewater reservoirs store effluents for irrigation in Israel. Effluent qualities differ according to the inflowing wastewater quality, the degree of pretreatment and the operational parameters. Certain aspects of water quality like concentration of organic matter, suspended solids and chlorophyll are significantly correlated with the water column transparency and colour. Accordingly optical images of the reservoirs obtained from the SPOT satellite demonstrate pronounced differences correlated with the water quality. The analysis of satellite multispectral images is based on a theoretical model. The model calculates, using the radiation transfer equation, the volume reflectance of the water body. Satellite images of 99 reservoirs were analyzed in the chromacity space in order to classify them according to water quality. Principal Component Analysis backed by the theoretical model increases the method sensitivity. Further elaboration of this approach will lead to the establishment of a time and cost effective method for the routine monitoring of these hypertrophic wastewater reservoirs.

The effects of osmotic pressure changes on the germination of Dictyostelium discoideum spores

1977 ◽  
Vol 23 (9) ◽  
pp. 1170-1177 ◽  
Author(s):  
David A. Cotter
Keyword(s):  
Ethylene Glycol ◽  
Dictyostelium Discoideum ◽  
Room Temperature ◽  
Thermal Inactivation ◽  
Sucrose Concentration ◽  
Lag Phase ◽  
Activation Process ◽  
Sucrose Solutions ◽  
Spore Population ◽  
Pressure Changes

Polyalcohols such as ethylene glycol and glycerol at 3 M penetrate and activate spores of Dictyostelium discoideum incubated at room temperature. Higher concentrations of ethylene glycol result in lysis upon suspension of spores in dilute phosphate buffer. Erythritol and arabitol at 3 M do not penetrate or activate D. discoideum spores.Air-dried spores or those incubated in 2 M sucrose solutions are not activated with the usual heat treatment of 45 °C for 30 min. The plasmolyzed spores are activated at temperatures above 45 °C when heated in the presence of 2 M sucrose for 30 min. The temperature for maximum activation and the temperature for thermal inactivation of spores are raised 7–10 °C in high sucrose concentrations. Long-term incubation of heat-activated spores in 2 M sucrose solutions does not result in a return to dormancy.Moderate sucrose concentrations near 0.2 M do not block the heat-induced activation process but must be removed from the spore population to prevent a return to dormancy within 6 h. Other polyhydric compounds at 0.25 M concentration also cause spore deactivation within 6 h of room temperature incubation. Oxygen uptake of spores undergoing deactivation in 0.18 M sucrose is inhibited as compared to control levels. Moderate concentrations of sucrose do not block the early events of postactivation lag and the spores accumulate at the end of the lag phase. The longer the spores remain unswollen at the end of the postactivation lag phase, the greater the percentage of spores which return to dormancy. The effects of moderate sucrose concentration (lowered water activity) are not duplicated by the same quantity of Ficoll, indicating that the colligative properties of the sucrose solutions are responsible for deactivation.

Taste Perception and Cerebral Activity in the Human Gustatory Cortex Induced by Glucose, Fructose, and Sucrose Solutions

2019 ◽  
Vol 44 (7) ◽  
pp. 435-447 ◽  
Author(s):  
Thomas Mouillot ◽  
Sophie Barthet ◽  
Lucie Janin ◽  
Camille Creteau ◽  
Hervé Devilliers ◽  
...  
Keyword(s):  
Taste Receptor ◽  
Sweet Taste ◽  
Molar Concentration ◽  
Cortical Activation ◽  
Taste Perception ◽  
Gustatory Cortex ◽  
Intensity Perception ◽  
Sucrose Solutions ◽  
Significant Difference ◽  
Sweetness Intensity

Abstract Glucose, fructose, and sucrose are important carbohydrates in Western diets with particular sweetness intensity and metabolisms. No study has compared their cerebral detection and their taste perception. Gustatory evoked potentials (GEPs), taste detection thresholds, intensity perception, and pleasantness were compared in response to glucose, fructose, and sucrose solutions at similar sweetness intensities and at identical molar concentrations. Twenty-three healthy subjects were randomly stimulated with 3 solutions of similar sweetness intensity (0.75 M of glucose, 0.47 M of fructose and 0.29 M of sucrose – sit. A), and with an identical molar concentration (0.29 M – sit. B). GEPs were recorded at gustatory cortex areas. Intensity perception and hedonic values of each solution were evaluated as were gustatory thresholds of the solutions. No significant difference was observed concerning the GEP characteristics of the solutions according to their sweetness intensities (sit. A) or their molar concentration (sit. B). In sit. A, the 3 solutions were perceived to have similar intensities and induced similar hedonic sensations. In sit. B, the glucose solution was perceived to be less intense and pleasant than the fructose and the sucrose solutions (P < 0.001) and the fructose solution was perceived to be less intense and pleasant than the sucrose (P < 0.001). Since GEP recordings were similar for glucose, fructose, and sucrose solutions whatever the concentrations, activation of same taste receptor induces similar cortical activation, even when the solutions were perceived differently. Sweet taste perception seems to be encoded by a complex chemical cerebral neuronal network.

AVALIAÇÃO TEMPO-INTENSIDADE DE DOÇURA E AMARGOR DE ASPARTAME E CICLAMATO/SACARINA EM EQUIVALÊNCIA À SACAROSE EM ALTAS CONCENTRAÇÕES

2001 ◽  
Vol 19 (2) ◽  
Author(s):  
HELENA MARIA ANDRÉ BOLINI CARDELLO ◽  
MARIA APARECIDA AZEVEDO PEREIRA DA SILVA ◽  
MARIA HELENA DAMÁSIO
Keyword(s):  
Sucrose Concentration ◽  
Temporal Behavior ◽  
Intensity Analysis ◽  
Concentration Increase ◽  
High Sucrose Concentration ◽  
High Sucrose

O objetivo do presente estudo foi caracterizar sensorialmente o aspartame e a mistura ciclamato/ sacarina 2:1, mediante análise tempo-intensidade capaz de avaliar as características temporais destes compostos. Os edulcorantes foram analisados nos níveis de doçura equivalentes à sacarose em solução a 20 e 30%. Constatou-se que o aspartame e a mistura ciclamato/sacarina 2:1 modificam seu comportamento temporal com aumento na concentração. TIME-INTENSITY EVALUATION OF SWEETNESS AND BITTERNESS OF ASPARTAME AND CYCLAMATE/SACCHARIN IN EQUIVALENT HIGH SUCROSE CONCENTRATION Abstract The objective of the present study was to sensory characterize aspartame and cyclamate/saccharin 2:1 blend by using time-intensity analysis, capable of evaluating the temporal attributes of these compounds. The sweeteners were evaluated at the equi-sweet level of sucrose in solution at 20 and 30%. It was noticed that the aspartame and cyclamate/saccharin 2:1 blend modifies their temporal behavior with concentration increase.

scholarly journals Distributed leadership and adaptive decision-making in the ant Tetramorium caespitum

2009 ◽  
Vol 277 (1685) ◽  
pp. 1267-1273 ◽  
Author(s):  
B. Collignon ◽  
C. Detrain
Keyword(s):  
Distributed Leadership ◽  
Food Source ◽  
Sucrose Concentration ◽  
Foraging Patterns ◽  
Tetramorium Caespitum ◽  
Collective Decisions ◽  
High Sucrose Concentration ◽  
Mass Recruitment ◽  
Adaptive Decision Making ◽  
High Sucrose

In the ant species Tetramorium caespitum , communication and foraging patterns rely on group-mass recruitment. Scouts having discovered food recruit nestmates and behave as leaders by guiding groups of recruits to the food location. After a while, a mass recruitment takes place in which foragers follow a chemical trail. Since group recruitment is crucial to the whole foraging process, we investigated whether food characteristics induce a tuning of recruiting stimuli by leaders that act upon the dynamics and size of recruited groups. High sucrose concentration triggers the exit of a higher number of groups that contain twice as many ants and reach the food source twice as fast than towards a weakly concentrated one. Similar trends were found depending on food accessibility: for a cut mealworm, accessibility to haemolymph results in a faster formation of larger groups than for an entire mealworm. These data provide the background for developing a stochastic model accounting for exploitation patterns by group-mass recruiting species. This model demonstrates how the modulations performed by leaders drive the colony to select the most profitable food source among several ones. Our results highlight how a minority of individuals can influence collective decisions in societies based on a distributed leadership.

504 Venous Thromboembolism Chemoprophylaxis in Burn Patients: A Literature Review and Single-institution Experience

2020 ◽  
Vol 41 (Supplement_1) ◽  
pp. S88-S89
Author(s):  
Alice Liu ◽  
Raquel Minasian ◽  
Ellen Maniago ◽  
Justin Gillenwater ◽  
Warren L Garner ◽  
...  
Keyword(s):  
Venous Thromboembolism ◽  
Retrospective Studies ◽  
Factor Xa ◽  
Cost Effective ◽  
Incidence Rates ◽  
Endothelial Damage ◽  
Burn Patients ◽  
Vein Thrombosis ◽  
Routine Monitoring ◽  
Meta Analyses

Abstract Introduction Hospitalized burn patients meet the criteria for Virchow’s triad (endothelial damage, hypercoagulability, and stasis), predisposing them to venous thromboembolism (VTE). While the cost, morbidity, and mortality of VTE suggest a need for prevention in this population, unreliable reported VTE rates, variable and complicated prophylaxis regimens, and risks associated with chemoprophylaxis have prevented the establishment of a universal protocol. This paper reviews the thromboprophylaxis practices both in the literature and at our own institution. Methods A systematic review was conducted according to Preferred Reported Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines identifying studies pertaining to VTE chemoprophylaxis in burn patients. Additionally, medical records of patients admitted to an American Burn Association-verified burn center between June 2015 and June 2019 were retrospectively reviewed for patient demographics, chemoprophylaxis, and presence of VTE defined as either deep vein thrombosis (DVT) or pulmonary embolism (PE). Results 35 studies met inclusion criteria. In the 11 studies that reported VTE incidence, rates ranged widely from 0.27 to 23.3%. The two largest retrospective studies (n = 33,637 and 36,638) reported a VTE incidence of 0.61% and a DVT incidence of 0.8% in populations with unknown or inconsistently recorded chemoprophylaxis. Throughout the literature, prevention protocols were mixed, though a trend toward using dose-adjusted subcutaneous low molecular weight heparin based on serum anti-factor Xa level was noted. At our institution, 1440 patients were admitted over four years. At-risk patients received a simple chemoprophylaxis regimen of 5000U of subcutaneous unfractionated heparin every eight hours. No routine monitoring tests were performed to limit cost. Ten cases of DVT and two cases of PE were identified with an incidence of 0.69% and 0.14%, respectively, and a total VTE incidence of 0.83%. One patient developed heparin-induced thrombocytopenia (0.07%). There were no other heparin-associated complications. Conclusions VTE incidence rates reported in the literature are wide-ranging and poorly capture the effect of any one chemoprophylaxis regimen in the burn population. Our center uses a single, safe, and cost-effective protocol with a VTE rate comparable to that of large national retrospective studies. Applicability of Research to Practice VTE continues to represent a threat to the burn population. While simple and safe chemoprophylaxis regimens exist, the optimal prevention protocol remains elusive.

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