DETERMINATION OF MINERAL Ca CONTENT IN SEVERAL KINDS OF FRESH FOOD AND PROCESSED PRODUCTS AS SWEETMEAT

2019 ◽  
Vol 1 (2) ◽  
pp. 27-32
Author(s):  
Achmad Syukur Hasibuan ◽  
Fahma Shufyani ◽  
Rinaldo Rinaldo
Keyword(s):  
Limit Of Detection ◽  
Sugar Content ◽  
High Sensitivity ◽  
Atomic Absorption Spectrophotometry ◽  
Fresh Food ◽  
High Sugar Content ◽  
Processed Products ◽  
Sulfur Containing ◽  
Different Levels

Sweetmeat is the processing foods preserved with high sugar content. In the manufacture of sweetmeat not only sugar but also added lime, salt, and sulfur-containing compounds. There are two forms of processed products of sweetmeat, namely wet sweetmeat and dry sweeteat. The basic thing that differentiate both  is how to make it, lasting power, and design products. This study aims to determine the level of calcium in the sample of fresh guava, ginger, and nutmeg, and to investigate the mineral calcium levels in samples of fresh and processed products as wet sweetmeat and dry sweetmeat.          Each sample must first be destructed by dry destruction, then the mineral assay performed with quantitative assay atomic absorption spectrophotometry (AAS) using a gas burner nitrous oxide-acetylene at a wavelength of 422.7 nm. The advantage of this method is to have a high sensitivity (limit of detection of less than 1 ppm), and the implementation is relatively simple.              Calcium levels in samples of fresh guava, ginger and nutmeg in a row each each sample as follows (7.7105 ± 0.1224) mg / 100 g, (14.5232 ± 0.117) mg / 100 g and (38, 8834 ± 0.6996) mg / 100 g. In the wet sweetmeat guava, ginger and nutmeg for (13.7787 ± 0.4123) mg / 100 g, (22.8345 ± 0.8247) mg / 100 g and (0.2284 ± 0.3759) mg / 100 g. While on dry sweetmeat guava, ginger and nutmeg for (160.9401 ± 0.4223) mg / 100 g, (176.0465 ± 1.0458) mg / 100 g and (120.4426 ± 0.7932) mg / 100 g. Levels of calcium contained in a sample of fresh guava, ginger and nutmeg and sweetmeat processed as wet and dry sweetmeat  has different levels

scholarly journals DETERMINATION OF MINERAL Ca CONTENT IN SEVERAL KINDS OF FRESH FOOD AND PROCESSED PRODUCTS AS SWEETMEAT

2019 ◽  
Vol 1 (2) ◽  
pp. 27-32
Author(s):  
Ahmad Syukur Hasibuan ◽  
Fahma Shufyani ◽  
Rinaldo Rinaldo
Keyword(s):  
Limit Of Detection ◽  
High Sensitivity ◽  
Atomic Absorption Spectrophotometry ◽  
Sensitivity Limit ◽  
Absorption Spectrophotometry ◽  
Fresh Food ◽  
Gas Burner ◽  
Processed Products ◽  
Different Levels

The basic thing that differentiate both is how to make it, lasting power, and design products. This study aims to determine the level of calcium in the sample of fresh guava, ginger, and nutmeg, and to investigate the mineral calcium levels in samples of fresh and processed products as wet sweetmeat and dry sweetmeat. Each sample must first be destructed by dry destruction, then the mineral assay performed with quantitative assay atomic absorption spectrophotometry (AAS) using a gas burner nitrous oxide-acetylene at a wavelength of 422.7 nm. The advantage of this method is to have a high sensitivity (limit of detection of less than 1 ppm), and the implementation is relatively simple. Calcium levels in samples of fresh guava, ginger and nutmeg in a row each each sample as follows (7.7105 ± 0.1224) mg / 100 g, (14.5232 ± 0.117) mg / 100 g and (38, 8834 ± 0.6996) mg / 100 g. In the wet sweetmeat guava, ginger and nutmeg for (13.7787 ± 0.4123) mg / 100 g, (22.8345 ± 0.8247) mg / 100 g and (0.2284 ± 0.3759) mg / 100 g. While on dry sweetmeat guava, ginger and nutmeg for (160.9401 ± 0.4223) mg / 100 g, (176.0465 ± 1.0458) mg / 100 g and (120.4426 ± 0.7932) mg / 100 g. Levels of calcium contained in a sample of fresh guava, ginger and nutmeg and sweetmeat processed as wet and dry sweetmeat has different levels

scholarly journals Copper-nickel oxide nanofilm modified electrode for non-enzymatic determination of glucose

2020 ◽  
Vol 10 (3) ◽  
pp. 245-255
Author(s):  
Mahsa Hasanzadeh ◽  
Zahra Hasanzadeh ◽  
Sakineh Alizadeh ◽  
Mehran Sayadi ◽  
Mojtaba Nasiri Nezhad ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Stability Loss ◽  
The Novel ◽  
Step Potential ◽  
Enzymatic Determination ◽  
Wide Range ◽  
Naoh Solution

CuxO-NiO nanocomposite film for the non-enzymatic determination of glucose was prepared by the novel modifying method. At first, anodized Cu electrode was kept in a mixture solution of CuSO4, NiSO4 and H2SO4 for 15 minutes. Then, a cathodization process with a step potential of -6 V in a mixture solution of CuSO4 and NiSO4 was initiated, generating formation of porous Cu-Ni film on the bare Cu electrode by electrodeposition assisted by the release of hydrogen bubbles acting as soft templates. Optimized conditions were determined by the experimental design software for electrodeposition process. Afterward, Cu-Ni modified electrode was scanned by cyclic voltammetry (CV) method in NaOH solution to convert Cu and Ni nanoparticles to the nano-scaled CuxO-NiO film. The electrocatalytic behavior of the novel CuxO-NiO film toward glucose oxidation was studied by CV and chronoamperometry (CHA) techniques. The calibration curve of glucose was found linear in a wide range of 0.04–5.76 mM, with a low limit of detection (LOD) of 7.3 µM (S/N = 3) and high sensitivity (1.38 mA mM-1 cm-2). The sensor showed high selectivity against some usual interfering species and high stability (loss of only 6.3 % of its performance over one month). The prepared CuxO-NiO nanofilm based sensor was successfully applied for monitoring glucose in human blood serum and urine samples.

Biological Conjugate between Antibody and ZnS Nanoparticles as Probe for Atomic Absorption Spectrophotometry Determination of Estriol

2014 ◽  
Vol 556-562 ◽  
pp. 64-66
Author(s):  
Chun Yan Zhang ◽  
Chuan Tao Wang ◽  
Shu Hao Wang ◽  
Ling Yun Du
Keyword(s):  
Atomic Absorption ◽  
Limit Of Detection ◽  
Water Solution ◽  
Semiconductor Nanocrystals ◽  
Atomic Absorption Spectrophotometry ◽  
Serum Samples ◽  
Absorption Spectrophotometry ◽  
Primary Materials ◽  
Good Agreement

ZnS semiconductor nanocrystals (NCs) were prepared by ways from primary materials of ZnCl2 and Na2S in water solution. Using the synthesized ZnS NCs, a polyclonal antibody-based ZnS-labelled immunosorbent assay for the determination of estriol (E3) was developed with atomic absorption spectrophotometry (AAS) as a detector. An immunoaffinity column was applied to testify conjugation between antibody and ZnS NCs. The linear range for determination of estriol is 40.0~600.0 ng.mL-1, and the limit of detection (LOD) is 10.0 ng.mL-1. Some serum samples have been analyzed with satisfactory results which are in good agreement with those obtained using ELISA. This work suggests the potential application of NCs as biological probes and AAS as detector in nonisotopic immunoassay.

Enzymic Determination of Starch in Samples with High Sugar Content

1990 ◽  
Vol 42 (12) ◽  
pp. 468-470 ◽  
Author(s):  
Robert J. Henry ◽  
Anthony B. Blakeney ◽  
Reginald C. M. Lance
Keyword(s):  
Sugar Content ◽  
High Sugar ◽  
High Sugar Content

scholarly journals Determination of cyanide in bamboo shoots by microdiffusion combined with ion chromatography–pulsed amperometric detection

2018 ◽  
Vol 5 (4) ◽  
pp. 172128 ◽  
Author(s):  
Ming Ding ◽  
Kailiang Wang
Keyword(s):  
Ion Chromatography ◽  
Limit Of Detection ◽  
Correlation Coefficients ◽  
Amperometric Detection ◽  
High Sensitivity ◽  
Practical Method ◽  
Pulsed Amperometric Detection ◽  
Bamboo Shoots ◽  
Relative Standard

A practical method for the determination of cyanide in bamboo shoots has been developed using microdiffusion preparation integrated with ion chromatography–pulsed amperometric detection (IC-PAD). Cyanide was released from bamboo shoots after Conway cell microdiffusion, and then analysed by IC-PAD. In comparison with the previously reported methods, derivatization and ion-pairing agent addition were not required in this proposed microdiffusion combined with IC-PAD method. The microdiffusion parameters were optimized including hydrolysis systems, temperature, time, and so on. Under the optimum conditions, the linear range of the calibration curve for cyanide was 0.2–200.0 µg kg −1 with satisfactory correlation coefficients of 0.9996 and the limit of detection was 0.2 µg kg −1 ( S/N  = 3). The spiked recovery range was from 92.8 to 98.6%. The intra-day and inter-day relative standard deviations of cyanide were 2.7–14.9% and 3.0–18.3%, respectively. This method was proved to be convenient in operation with high sensitivity, precision and accuracy, and was successfully applied in the determination of cyanide in bamboo shoot samples.

scholarly journals Non-enzymatic sensor for determination of glucose based on PtNi nanoparticles decorated graphene

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Risheng Li ◽  
Xu Deng ◽  
Longfei Xia
Keyword(s):  
Limit Of Detection ◽  
High Sensitivity ◽  
Glucose Detection ◽  
Serum Samples ◽  
Time Curve ◽  
Current Time ◽  
Glass Carbon ◽  
Graphene Glass ◽  
Ptni Alloy

Abstract Diabetes has become a universal epidemic in recent years. Herein, the monitoring of glucose in blood is of importance in clinical applications. In this work, PtNi alloy nanoparticles homogeneously dispersed on graphene (PtNi alloy-graphene) was synthesized as a highly effective electrode material for glucose detection. Based on the modified PtNi alloy-graphene/glass carbon (PtNi alloy-graphene/GC) electrode, it is found that the PtNi alloy-graphene/GC electrode exhibited excellent electrocatalytic performance on glucose oxidation. Furthermore, the results from amperometric current–time curve show a good linear range of 0.5–15 mM with the limit of detection of 16 uM (S/N = 3) and a high sensitivity of 24.03 uAmM−1 cm−2. On account of the good selectivity and durability, the modified electrode was successfully applied on glucose detection in blood serum samples.

Validated green chromatographic methods for determination of amlodipine and celecoxib in presence of methylacetophenone

Bioanalysis ◽  
2021 ◽  
Author(s):  
Marco M Z Sharkawi ◽  
Norhan R Mohamed ◽  
Mohammed T El-Saadi ◽  
Noha H Amin
Keyword(s):  
Aqueous Solution ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Amlodipine Besylate ◽  
Rapid Methods ◽  
Ich Guidelines ◽  
Layer Chromatography

Aim: Green, accurate and rapid methods, namely LC–MS/MS and thin layer chromatography-densitometric methods, were developed for determination of amlodipine besylate and celecoxib in presence of its process-related impurities, 4-methylacetophenone in pure and formulated tablets. Results: LC–MS/MS was achieved on ZORBAX Eclipse Plus C18 column using methanol: aqueous solution of 5 mM formic acid (95:5 v/v). High sensitivity with low limit of detection values 0.00028, 0.00027 and 0.0003 for amlodipine, celecoxib and 4-methylacetophenone, respectively were obtained. While, thin layer chromatography-densitometric was established using methanol: water: ammonia (70: 25: 1.5, by volume). Good linearity was obtained in the range of 0.1–10 μg/band, 1–150 μg/band and 0.01–2 μg/band for amlodipine, celecoxib and 4-methylacetophenone, respectively. Conclusion: The proposed method validation was achieved according to ICH guidelines. Those methods possess advantages of being ecofriendly methods which permit their application in quality control laboratories.

scholarly journals Development of the High Sensitivity and Selectivity Method for the Determination of Histamine in Fish and Fish Sauce from Vietnam by UPLC-MS/MS

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Quang Hieu Tran ◽  
Thanh Tan Nguyen ◽  
Kim Phuong Pham
Keyword(s):  
Limit Of Detection ◽  
High Sensitivity ◽  
Fish Sauce ◽  
Limit Of Quantification ◽  
Fish Samples ◽  
The Matrix ◽  
Liquid Chromatography Tandem Mass ◽  
Sensitivity And Selectivity ◽  
Liquid Chromatographic

A selective, sensitive, and rapid method by using ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) for the determination of histamine in fish and fish sauce was developed. The optimal conditions of liquid chromatographic separation and mass spectroscopy of histamine have also been investigated. The linear ranges of the method were 20.0 ÷ 1000 ng/mL, and the corresponding correlation coefficient was 0.9993. Mean recoveries of the analyte at three spike levels (low, medium, and high) were within the range of 98.5% ÷ 102.5% (n = 7). The limit of detection (LOD) and limit of quantification (LOQ) values were 3.83 and 11.50 ng/mL for the fish sauce sample and 4.71 and 14.12 ng/mL for the fish sample, respectively. The influence of the matrix effect on the accuracy, repeatability, and recovery of the method was negligible. The recommended method was applied to determine the content of this substance in 21 fish sauce samples and 4 kinds of fish samples, which were collected from Ho Chi Minh City, Vietnam, in 2019.

scholarly journals Electrochemical detection of chlorpheniramine maleate in the presence of an anionic surfactant and its analytical applications

2017 ◽  
Vol 95 (5) ◽  
pp. 553-559 ◽  
Author(s):  
Nagaraj Shetti ◽  
Deepti Nayak
Keyword(s):  
Anionic Surfactant ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Linear Calibration ◽  
Chlorpheniramine Maleate ◽  
Point Of Interest ◽  
Wave Voltammetry ◽  
Diffusion Controlled ◽  
Charge Transfer Coefficient

Improvement of methods for the detection of an analyte at a low concentration with high sensitivity has become an important point of interest. An effort has been made to know the electrochemical behavior of chlorpheniramine maleate in the presence of an anionic surfactant. Voltammograms were obtained in the range of 6.0–11.2 pH, and the maximum peak current (IP) was observed at pH 10.4. Various physicochemical parameters were estimated, including the process on the surface of the electrode, which was found to be diffusion controlled, heterogeneous rate constant, number of electrons transferred, and charge transfer coefficient. Square wave voltammetry of chlorpheniramine maleate at the modified electrode exhibited a linear calibration curve in the concentration range of 1.0–100 μmol/L, with a limit of detection of 28 nmol/L. The proposed technique was successfully used for the determination of chlorpheniramine maleate in pharmaceuticals, as well as in biological samples.

scholarly journals Dispersed Conducting Polymer Nanocomposites with Glucose Oxidase and Gold Nanoparticles for the Design of Enzymatic Glucose Biosensors

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2173
Author(s):  
Natalija German ◽  
Almira Ramanaviciene ◽  
Arunas Ramanavicius
Keyword(s):  
Glucose Oxidase ◽  
Conducting Polymer ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Serum Samples ◽  
Glucose Determination ◽  
Constant Potential ◽  
Good Repeatability ◽  
Graphite Rod

Biosensors for the determination of glucose concentration have a great significance in clinical diagnosis, and in the food and pharmaceutics industries. In this research, short-chain polyaniline (PANI) and polypyrrole (Ppy)-based nanocomposites with glucose oxidase (GOx) and 6 nm diameter AuNPs (AuNPs(6 nm)) were deposited on the graphite rod (GR) electrode followed by the immobilization of GOx. Optimal conditions for the modification of GR electrodes by conducting polymer-based nanocomposites and GOx were elaborated. The electrodes were investigated by cyclic voltammetry and constant potential amperometry in the presence of the redox mediator phenazine methosulfate (PMS). The improved enzymatic biosensors based on GR/PANI-AuNPs(6 nm)-GOx/GOx and GR/Ppy-AuNPs(6 nm)-GOx/GOx electrodes were characterized by high sensitivity (65.4 and 55.4 μA mM−1 cm−2), low limit of detection (0.070 and 0.071 mmol L−1), wide linear range (up to 16.5 mmol L−1), good repeatability (RSD 4.67 and 5.89%), and appropriate stability (half-life period (τ1/2) was 22 and 17 days, respectively). The excellent anti-interference ability to ascorbic and uric acids and successful practical application for glucose determination in serum samples was presented for GR/PANI-AuNPs(6 nm)-GOx/GOx electrode.

Sign in / Sign up

Export Citation Format

Share Document