ChemInform Abstract: THE MECHANISM OF THE AUTOXIDATION OF ASCORBIC ACID CATALYZED BY IRON SALTS IN CITRIC ACID SOLUTION

1975 ◽  
Vol 6 (17) ◽  
pp. no-no
Author(s):  
LAURI PEKKARINEN
Keyword(s):  
Ascorbic Acid ◽  
Citric Acid ◽  
Acid Solution ◽  
Citric Acid Solution ◽  
Iron Salts ◽  
Acid Catalyzed

Inactivation of Salmonella during Drying and Storage of Apple Slices Treated with Acidic or Sodium Metabisulfite Solutions

2003 ◽  
Vol 66 (12) ◽  
pp. 2245-2251 ◽  
Author(s):  
PATRICIA A. DiPERSIO ◽  
PATRICIA A. KENDALL ◽  
MEHMET CALICIOGLU ◽  
JOHN N. SOFOS
Keyword(s):  
Ascorbic Acid ◽  
Citric Acid ◽  
Acid Solution ◽  
Brilliant Green ◽  
Sodium Metabisulfite ◽  
Sterile Water ◽  
Citric Acid Solution ◽  
Acidic Solutions ◽  
Apple Slices ◽  
And Storage

This study was undertaken to determine whether pretreating inoculated Gala apple slices with metabisulfite or acidic solutions enhanced the inactivation of Salmonella during dehydration and storage. Apple slices inoculated with a five-strain mixture of Salmonella (7.6 log CFU/g) were pretreated, dried for 6 h at 60°C, and stored aerobically at 25°C for 28 days. Predrying treatments included (i) no treatment, (ii) 10 min of immersion in sterile water, (iii) 10 min of immersion in a 4.18% sodium metabisulfite solution, (iv) 10 min of immersion in a 3.40% ascorbic acid solution, and (v) 10 min of immersion in a 0.21% citric acid solution. Samples were plated on tryptic soy agar with 0.1% pyruvate (TSAP), brilliant green sulfa (BGS) agar, and xylose lysine tergitol 4 (XLT4) agar for the enumeration of bacteria. Populations were not significantly (P > 0.05) reduced by immersion in water but were reduced by 0.7 to 1.1 log CFU/g by immersion in acidic solutions. Immersion in the sodium metabisulfite solution reduced populations by 0.4, 1.3, and 5.4 log CFU/g on TSAP, BGS agar, and XLT4 agar, respectively. After 6 h of dehydration at 60°C, populations on untreated and water-treated slices were reduced by 2.7 to 2.8, 2.7 to 2.9, and 4.0 to 4.2 log CFU/g as determined with TSAP, BGS agar, and XLT4 agar, respectively. In contrast, populations on slices treated with sodium metabisulfite, ascorbic acid, and citric acid were reduced after 6 h of dehydration by 4.3, 5.2, and 3.8 log CFU/g, respectively, as determined with TSAP; by 4.7, 5.5, and 3.9 log CFU/g, respectively, as determined with BGS agar; and by 5.5, 5.7, and 5.6 log CFU/g, respectively, as determined with XLT4 agar. Bacteria were still detectable by direct plating after 28 days except on slices treated with ascorbic acid. Immersion in metabisulfite or acidic solutions prior to dehydration should enhance the inactivation of Salmonella during the dehydration and storage of Gala apple slices.

scholarly journals PHYSICOCHEMICAL, SENSORIAL AND MICROBIOLOGICAL ANALYSIS OF MINIMALLY PROCESSED FRUITS OF PAPAYA AND PINEAPPLE

2021 ◽  
Vol 21 (No 1) ◽  
Author(s):  
Rizwana . ◽  
Ruchi Sharma ◽  
Eram Rao ◽  
Tanya Luva Swer ◽  
Aparna Agarwal
Keyword(s):  
Ascorbic Acid ◽  
Sodium Chloride ◽  
Citric Acid ◽  
Low Temperature ◽  
Acid Solution ◽  
Shelf Life ◽  
Microbiological Analysis ◽  
Citric Acid Solution ◽  
Minimally Processed ◽  
Fruit Samples

The current study intended to discover the storage/shelf life of papaya and pineapple, minimally processed fruits, based on their physicochemical, sensorial, and microbiological analysis. They were stored at low temperature at 4?C for 8 days. Methods: The papaya slices were dipped into 1000ppm citric acid solution and a solution of 150ppm ascorbic acid and 1000ppm citric acid. On other hand, pineapple slices were dipped into a solution of 1% sodium chloride and 1% calcium chloride and another solution of 150ppm ascorbic acid and 1000ppm citric acid. Both fruit samples were immersed into the respective solutions for around 2-3minutes. Results: From the results of treatments, it was revealed that the combination of 150ppm ascorbic acid and 1000ppm citric acid solution, in both the samples showed the best outcomes. Conclusion: It ultimately concludes that after this treatment the minimally processed papaya and pineapple can be stored effectively and safely in good conditions for 8 days at low temperature.

scholarly journals Comparative Analysis of Flour Properties of Dioscorea alata Tuber And Its Utilization On Wet Noodle

2019 ◽  
Vol 1 (2) ◽  
pp. 70-75
Author(s):  
Lavlinesia Lavlinesia
Keyword(s):  
Ascorbic Acid ◽  
Citric Acid ◽  
Acid Solution ◽  
Food Industry ◽  
Dioscorea Alata ◽  
Citric Acid Solution ◽  
Ascorbic Acid Solution ◽  
Random Design ◽  
The World ◽  
Flour Properties

Abstract— Dioscorea alata grown in many areas of the world has been intensively studied.  However none of Indonesian cultivar has been intensively studied for their properties and its utilization in food industry. This research was aimed to compare the properties of purple Dioscorea alata’s flour produced using different methods and to study the effect of partly substituted wheat by purple Dioscorea alata’s flour on the characteristic of wet noodles. The research on the properties of purple Dioscorea alata’s flour was conducted using complete random design with treatment on the methods used to produce flour: control, steaming, soaking in 1% citric acid solution + steaming, blanching + soaking in 1% citric acid solution + steaming and blanching + soaking in 2% ascorbic acid solution + steaming.These 5 methods were repeated 4 times. The research on utilization of Dioscoreaalata’s flour on wet noodle was conducted using complete random design with 5 levels of treatment (0%, 10%, 20%, 30%, and 40% of Dioscorea alata’s flour) and 4 replications.   The result showed that steaming the slices of tuber for 7 minutes prior to drying was an effective method to produce flour with strong natural color of purple. The concentration of Dioscorea alata’s flour significantly affects the elongation and texture of noodle (p<0.05).   Except for its unpleasant grey color, wet noodle can be produced using up to 40% Dioscorea alata’s flour.

Solubility of Phosphorus in Citric Acid Solution as an Index of Biological Availability

1979 ◽  
Vol 16 (5) ◽  
pp. 290-292 ◽  
Author(s):  
Minoru YOSHIDA ◽  
Michiyuki ISHIKAWA ◽  
Hiroki NAKAJIMA ◽  
Saburo HOTTA
Keyword(s):  
Citric Acid ◽  
Acid Solution ◽  
Biological Availability ◽  
Citric Acid Solution

scholarly journals Kinetic Study in Atmospheric Pressure Organic Acid Leaching: Shrinking Core Model versus Lump Model

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 613
Author(s):  
Kevin Cleary Wanta ◽  
Widi Astuti ◽  
Indra Perdana ◽  
Himawan Tri Bayu Murti Petrus
Keyword(s):  
Citric Acid ◽  
Acid Solution ◽  
Acid Leaching ◽  
Core Model ◽  
Shrinking Core Model ◽  
Citric Acid Solution ◽  
Lumped Model ◽  
Leaching Process ◽  
Shrinking Core ◽  
Simulation Results

The kinetics study has an essential role in the scale-up process because it illustrates the real phenomena of a process. This study aims to develop a mathematical model that can explain the mechanism of the leaching process of laterite ore using a low concentration of the citric acid solution and evaluate that model using the experimental data. As a raw material, this process used powder-shaped limonite laterite ores with a size of 125–150 µm. The leaching process is carried out using 0.1 M citric acid solution, F:S ratio of 1:20, and a leaching time of 2 h. The temperature parameter was varied at 303, 333, and 358 K. The experimental results showed that the higher the operating temperature, the higher the extracted nickel. The results of this experiment were used to evaluate the shrinking core kinetics model and the lumped model. The simulation results for both models show that the lumped model can provide better simulation results. Quantitatively, the percentage of errors from the shrinking core model is around 3.5 times greater than the percentage of errors from using the lumped model. This result shows that in this leaching process, the process mechanism that occurs involves the reactant diffusion step and the chemical reactions step; those steps run simultaneously.

Dissolution mechanism of various elements from steelmaking slag into citric acid solution

2019 ◽  
Vol 116 (3) ◽  
pp. 321
Author(s):  
Ningning Lv ◽  
Chang Su ◽  
Hui Kong ◽  
Jinxing Yang ◽  
Weiming Liu ◽  
...  
Keyword(s):  
Citric Acid ◽  
Acid Solution ◽  
Mass Balance ◽  
Dissolution Mechanism ◽  
Steelmaking Slag ◽  
Citric Acid Solution ◽  
Initial Concentration ◽  
Predominant Species ◽  
Dissolution Ratio ◽  
The Relationship

To recycle valuable elements from steelmaking slag, their dissolution mechanism into citric acid solution has been investigated. First, the relationship between dissolution ratio of each element and initial concentration of citric acid (ci) was studied. Then, the concentrations of each species in solution were calculated through mass balance. Based on these results, it can been seen that whenci = 0.00104 mol/L, Ca2+, CaCit−, MgCit−, FeH2PO42+and CaHPO4are the predominant species in solution, and Ca5(PO4)3(OH)(s) precipitate can form easily, which may suppress the dissolution of elements. Whenciincreases to 0.0104 mol/L, dissolution ratio of each element increases significantly, except for iron. And the predominant species correspondingly change to Ca2+, Mg2+, CaCit−, MgCit−, H2Cit−, H3Cit and FeH2PO42+.

Sign in / Sign up

Export Citation Format

Share Document