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Papers by hocine bouleghlem

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1995

The investigation by FT-IR and Raman spectroscopy of several cyclodextrin inclusion complexes rev... more The investigation by FT-IR and Raman spectroscopy of several cyclodextrin inclusion complexes reveals structural features not readily accessible by other spectroscopic methods. Thus, the cis conformation of terephthalaldehyde dominates within the ct-cyclodextrin cavity. The locked and unlocked acetate group of hydroquinone diacetate in fl-cyclodextrin can be easily distinguished, while p-benzenedimethanol diacetate displays the features of a "solid solution". Finally, the detection of hydrogen bonding in the ~-cyclodextrin inclusion compound of butanediol diacetate brings to light even more complex supramolecular structures.

International Journal of Chemical Engineering and Applications, 2016

Since the microwave was used for the first time in 1986 in the field of the organic synthesis, th... more Since the microwave was used for the first time in 1986 in the field of the organic synthesis, the reactions assisted by microwaves are used more and more in the strategies of synthesis. It meets an interest growing because of its great effectiveness and its extreme profitability due to reduced reaction times, better outputs and obtaining purer products. Its particular use, was the subject of a method around whose developed a green chemistry. Several developed, he was devoted, and the last in date is a work C.O. Kappe in 2005. Within the framework of this work, we will try to develop an aspect of the chemistry of the protective groupings: chimioselective protection deprotection of N-Boc-Glucosamine-Acyle by irradiation under domestic microwave. The usual spectroscopic methods (1 H NMR, IR and MS) were made profitable for elucidation synthesized structures.

Emirates Journal of Food and Agriculture

Spirulina (Arthrospira platensis) is a microalga that has existed for more than three billion yea... more Spirulina (Arthrospira platensis) is a microalga that has existed for more than three billion years. It belongs to the family of cyanobacteria. It is extraordinary, rich in nutrients such as proteins, carbohydrates, lipids, vitamins, and minerals. In addition, Spirulina is rich in phycocyanin, a blue protein pigment. It can be used as a dye in food, pharmacology, and cosmetics. Our work focused first on the compatibility of the waters of M’sila region (southeast Algeria) for the cultivation of Arthrospira platensis. Then, we evaluated several methods of extracting phycocyanin to be able to determine the optimal method in terms of yield. We have succeeded in developing a new extraction method coupled with maceration in a glycerol-water mixture with a molar ratio (8/2) assisted by ultrasound with a yield of 52.93 mg/g. The excellent results obtained may be due to the salinity of the waters of the region, to the used nutrient culture medium and/or the climate change of the region. We h...

Volume 1: Aircraft Engine; Fans and Blowers; Marine, 2018

Maintenance costs are a substantial contributor to airline operating costs. In this context, unde... more Maintenance costs are a substantial contributor to airline operating costs. In this context, understanding, analyzing, and predicting engine performance deterioration is crucial. While diagnostic methods for analyzing the current module and overall engine condition are established in state-of-the-art engine condition monitoring (ECM) systems, deterioration modeling and prognosis are still fields of research. The identification of the contribution of deterioration mechanisms, such as fouling, erosion, and abrasion, to the in-service deterioration poses a key challenge in this area. This paper focuses on a top-down approach for the high pressure compressor (HPC) module. The selected approach is to quantify the contribution of individual deterioration mechanisms to the overall HPC efficiency deterioration based on in-flight measurements. This is accomplished by first using the in-flight measurements to analyze the HPC efficiency loss. Then, the resulting time series of the analyzed HPC...

Tetrahedron Letters, 2012

Nucleosides, Nucleotides and Nucleic Acids, 2007

A series of chiral cyclosulfamides and oxazolidinon-2-ones have been synthesized starting from am... more A series of chiral cyclosulfamides and oxazolidinon-2-ones have been synthesized starting from aminoacids. Regioselective substitution of these pseudopyrimidic heterocyles was carried out under Mitsunobu conditions. Best substitution results were obtained by preliminary deprotection of cyclosulfamides and their condensation with beta-D-ribofuranose. Chiral oxazolidin-2-ones were coupled directly with D-ribofuranose. All compounds were tested against HSV-2, VV and SV viruses. Two compounds 6b and 6e showed significant activities against HSV-type 1.