Fatty Acid Oxidizing Activity in a Red Marine Alga, Porphyra sp.

2000 ◽  
Vol 55 (11-12) ◽  
pp. 903-909 ◽  
Author(s):  
Tadahiko Kajiwara ◽  
Kenji Matsui ◽  
Yoshihiko Akakabe ◽  
Kaori Okajima ◽  
Anong Chirapart
Keyword(s):  
Fatty Acid ◽  
Linoleic Acid ◽  
Gel Filtration ◽  
Array Detector ◽  
Prosthetic Group ◽  
Photodiode Array Detector ◽  
Sds Page ◽  
Uptake Activity ◽  
Photodiode Array ◽  
Substrate Fatty Acid

A crude enzyme solution prepared from fronds of Porphyra sp. showed rem arkable oxygen uptake activity when linoleic acid was added as a substrate. Fatty acid oxidizing activity was mainly present in the soluble fraction of the crude homogenate. The activity was purified 769- fold from mature fronds by ammonium sulfate fractionation, ion-exchange and hydrophobic chromatography. SDS-PAGE analysis of the purified proteins indicated that its subunit size was about 13 kDa. Gel filtration chromatography equipped with a photodiode array detector revealed that the activity was associated with a protein having a molecular weight of 12,500- 13,000. It eluted with a chromophore having the maximum absorbance at 417 nm, thus, the a protein was suggested to be a heme protein. The spectrophotometric property of the protein was highly similar to that of cytochrome c suggesting that it has heme c as a prosthetic group. The protein showed highest oxygenation activity against linoleic acid, and α-linolenic acid and arachidonic acid followed, but oleic acid could not be oxidized. From linoleic acid the protein form ed 9- and 13-hydroperoxides to the same extent, and both were shown to be racemic. These results showed that the oxidizing activity is accountable to a cytochrome, but not to a typical lipoxygenase.

Determination of Niacin in Infant Formula by Solid-phase Clean-up and HPLC with Photodiode Array Detector

2009 ◽  
Vol 38 (3) ◽  
pp. 359-363
Author(s):  
Jee-Eun Hong ◽  
Mi-Ran Kim ◽  
Sang-Hee Cheon ◽  
Jung-Young Chai ◽  
Eun-Ryong Park ◽  
...  
Keyword(s):  
Infant Formula ◽  
Solid Phase ◽  
Array Detector ◽  
Photodiode Array Detector ◽  
Photodiode Array

Development and Validation of an HPLC Method for Determination of Spirotetramat and Spirotetramat cis enol in Various Vegetables and Soil

2013 ◽  
Vol 96 (3) ◽  
pp. 670-675 ◽  
Author(s):  
Balwinder Singh ◽  
Kousik Mandal ◽  
Sanjay K Sahoo ◽  
Urvashi Bhardwaj ◽  
Raminderjit Singh Battu
Keyword(s):  
Analytical Method ◽  
Anhydrous Sodium Sulfate ◽  
Hplc Method ◽  
Array Detector ◽  
Photodiode Array Detector ◽  
Photodiode Array ◽  
Precision And Accuracy ◽  
Hplc Grade Acetonitrile ◽  
Development And Validation

Abstract An easy and simple analytical method was standardized and validated for the estimation of residues of spirotetramat and its metabolite spirotetramat cis enol in various substrates: okra fruits, brinjal leaves and fruits, green chili, red chili, and soil. The samples were extracted with acetonitrile, diluted with brine solution, partitioned into dichloromethane, dried over anhydrous sodium sulfate, and cleaned up by treatment with activated charcoal powder. Final clear extracts were concentrated under vacuum and reconstituted with HPLC grade acetonitrile. Residues were estimated using HPLC with a photodiode array detector and a C18 column, and confirmed by HPTLC. Acetonitrile was used as the mobile phase at 0.4 mL/min. Both spirotetramat and spirotetramat cis enol presented distinct peak at retention times of 8.518 and 7.598 min, respectively. Consistent recoveries ranging from 82 to 97% for spirotetramat and spirotetramat cis enol were observed when samples were spiked at 1.00 to 0.03 mg/kg levels. The LOQ of the method was found to be 0.03 mg/kg. The analytical method was validated in terms of parameters, including selectivity, linearity, precision, and accuracy.

Simultaneous flow-injection determination of o- and p-nitrophenol using a photodiode-array detector

1992 ◽  
Vol 258 (2) ◽  
pp. 269-273 ◽  
Author(s):  
M.E. León-González ◽  
L.V. Pérez-Arribas ◽  
M.J. Santos-Delgado ◽  
L.M. Polo-Díez
Keyword(s):  
Flow Injection ◽  
Array Detector ◽  
Photodiode Array Detector ◽  
Photodiode Array

Application of a photodiode array detector to multi-component determination by flow injection analysis

The Analyst ◽  
1987 ◽  
Vol 112 (5) ◽  
pp. 619-622 ◽  
Author(s):  
Marcelo Blanco ◽  
Jordi Gené ◽  
Hortensia Iturriaga ◽  
Santiago Maspoch
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Array Detector ◽  
Photodiode Array Detector ◽  
Photodiode Array

Development and validation of a fast and simple HPLC method for the simultaneous determination of aniline and its degradation products in wastewater

2016 ◽  
Vol 8 (30) ◽  
pp. 5949-5956 ◽  
Author(s):  
Soumia Boulahlib ◽  
Ali Boudina ◽  
Kahina Si-Ahmed ◽  
Yassine Bessekhouad ◽  
Mohamed Trari
Keyword(s):  
High Performance ◽  
Degradation Products ◽  
Reversed Phase ◽  
Hplc Method ◽  
Array Detector ◽  
Simple Method ◽  
Photodiode Array Detector ◽  
Photodiode Array ◽  
Development And Validation

In this study, a rapid and simple method based on reversed-phase high performance liquid chromatography (RP-HPLC) using a photodiode array detector (PDA) for the simultaneous analysis of five pollutants including aniline and its degradation products, para-aminophenol, meta-aminophenol, ortho-aminophenol and phenol, was developed.

Stability Indicating Photodiode Array Detector Based Estimation of Dapagliflozin Propanediol Monohydrate in API and Tablet Dosage Form by RP-UPLC

2021 ◽  
pp. 4635-4639
Author(s):  
Ashok B. Patel ◽  
Ekta H. Vaghasiya ◽  
Amit R. Dudhatra ◽  
Amitkumar J. Vyas ◽  
Ajay I. Patel ◽  
...  
Keyword(s):  
Dosage Form ◽  
Active Pharmaceutical Ingredient ◽  
Array Detector ◽  
Column Temperature ◽  
Stability Indicating ◽  
Photodiode Array Detector ◽  
Acceptable Method ◽  
Photodiode Array ◽  
Tablet Dosage

Stability indicating RP-UPLC photo diode array detector based method for determination of Dapagliflozin propanediol monohydrate (DPM) in active pharmaceutical ingredient (API) and in tablet dosage form (5mg dapagliflozin) has been developed and validated on Bridge Ethylene Hybride (BEH) C18 column (50mm × 2.1 mm, 1.7µm). Mobile phase composition was water: acetonitrile (60:40 v/v), flow rate 0.5ml/min and detection carried out at 223nm at column temperature 30ºC. Chromatographic separation achieved within 2 min with retention time 0.77 min. Linearity of the method was found over the concentration range of 25-75µg/ml (R2 = 0.9977). The degradation was carried out in five different stress conditions. The developed method was able to resolve peak of API from all generated peaks. Sufficient degradation was achieved in the range of 5.25 to 12.31%. The peak purity is acceptable, Method validation was performed as per ICH guideline Q2(R1).

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