Microstructure and mechanical properties of Pt-added and Pd-added Zr-20Nb alloys and their metal release in 1mass% lactic acid solution

2011 ◽  
Vol 31 (5) ◽  
pp. 900-905 ◽  
Author(s):  
R. Kondo ◽  
Suyalatu ◽  
Y. Tsutsumi ◽  
H. Doi ◽  
N. Nomura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Acid Solution ◽  
Metal Release ◽  
Lactic Acid Solution ◽  
Microstructure And Mechanical Properties

scholarly journals A study on highly concentrated lactic acid and the synthesis of lactide from its solution

2021 ◽  
pp. 174751982110210
Author(s):  
Xiaolong Xu ◽  
Lijuan Liu
Keyword(s):  
Lactic Acid ◽  
Acid Solution ◽  
Concentration Distribution ◽  
Raw Material ◽  
High Concentration ◽  
Composition Distribution ◽  
Lactic Acid Solution ◽  
H Nmr ◽  
Back Titration ◽  
Condensed Water

Lactic acid is an important platform compound used as raw material for the production of lactide and polylactic acid. However, its concentration and composition distribution are not as simple as those of common compounds. In this work, the mass concentration distribution of highly concentrated lactic acid is determined by back titration. The components of highly concentrated lactic acid, crude lactide, and polymer after the reaction are analyzed by HPLC. Different concentrations of lactic acid solution were prepared for the synthesis of lactide and its content in the product was determined by 1H NMR analysis. We found that lactide is more easily produced from high-concentration lactic acid solution with which the condensed water is easier to release. Hence, the removal of condensed water is crucial to the formation of lactide, although it is not directly formed by esterification of two molecules of lactic acid.

Storage of polyacid-modified resin composites (“compomers”) in lactic acid solution

1999 ◽  
Vol 15 (6) ◽  
pp. 413-416 ◽  
Author(s):  
J.W. Nicholson ◽  
B.J. Millar ◽  
B. Czarnecka ◽  
H. Limanowska-Shaw
Keyword(s):  
Lactic Acid ◽  
Acid Solution ◽  
Resin Composites ◽  
Lactic Acid Solution ◽  
Modified Resin

scholarly journals THE EFFECT OF LACTIC ACID AND ARTIFICIAL SALIVA SOLUTION IMMERSION TO THE RELEASE OF CALCIUM IONS ON BIOACTIVE RESIN

2021 ◽  
Vol 6 (2) ◽  
pp. 190
Author(s):  
Dewi Puspitasari ◽  
Nurah Tajjalia ◽  
Diana Wibowo ◽  
Agung Satria Wardhana
Keyword(s):  
Lactic Acid ◽  
Acid Solution ◽  
Calcium Ions ◽  
Calcium Ion ◽  
Artificial Saliva ◽  
Distilled Water ◽  
Acid Condition ◽  
Ion Release ◽  
Lactic Acid Solution ◽  
Solution Increase

Background: Bioactive resin can release calcium ions when contact with solution media, even in acid condition. In the oral cavity, pH may change into acid condition due to the metabolic results of Streptococcus mutans. The bacteria metabolize carbohydrates into organic acids, one of which is lactic acid. Purpose: Analyze the effect of lactic acid solution and artificial saliva on the number of the release of calcium ions of bioactive resin. Methods: Forty-two specimens (diameter 15 mm x thickness 1 mm; n= 7/group fabricated with Activa™ Bioactive Restorative (Pulpdent). The specimens that meet the criteria were divided into 6 groups. The specimen was immersed for 1 and 7 days in the incubator at 37oC. The number of calcium ion release is measured using titration method. Results: Two Way Anova test and Post Hoc Bonferonni test showed there were significant differences among all group for lactic acid 1 day (4.040 ± 0.360) µg, artificial saliva 1 day (0.640 ± 0.338) µg, distilled water 1 day (1.040 ± 0.504) µg, lactic acid 7 days (5.400 ± 0.312), artificial saliva 7 days (1.640 ± 0.215) µg, distilled water 7 days (3.520± 0.356 µg). Conclusion: There was an influence of lactic acid and artificial saliva on the number of calcium ion releases of bioactive resin. Immersion of bioactive resin in the lactic acid solution increase the calcium ion releases and artificial saliva decrease the calcium ion release compared to distilled water. Keywords: artificial saliva, bioactive resin, calcium ion release, lactic acid

Impact of -isomer content on the microstructure and mechanical properties of uniaxially pre-stretched poly(lactic acid)

Polymer ◽  
2020 ◽  
Vol 186 ◽  
pp. 122022
Author(s):  
Yunjing Chen ◽  
Ling Zhao ◽  
Hongwei Pan ◽  
Shiling Jia ◽  
Lijing Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Microstructure And Mechanical Properties ◽  
Isomer Content
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