scholarly journals Determination Of Formaldehyde In Tofu From Ciputat Traditional Market With Colorimetry Method

2011 ◽  
Vol 2 (2) ◽  
Author(s):  
Zilhadia Zilhadia ◽  
Sanny Susanti
Keyword(s):  
Linear Regression ◽  
Calibration Curve ◽  
Analytical Method ◽  
Steam Distillation ◽  
Food Product ◽  
Extraction Process ◽  
Sample Extraction ◽  
Traditional Market ◽  
Nash Reagent

Tofu, a food product made from soybean, contain water and it is very easy to overgrown microbes.Based on a survey, many products of tofu contain formaldehyde as preservative. Formaldehyde is apreservative that the use is prohibited for food because it can cause cancer in humans. The aim of thisstudy was determined concentration of formaldehyde in tofu from traditional market Ciputat usingSpectrophotometer UVI-VIS. Steam distillation was used for sample extraction process. Distillate wasreacted with Nash reagent. The equation of calibration curve is y=0,0032x – 0,0079 and correlationcoefficient of the linear regression of 0,9992. The experimental results obtained LOD value of11.1328 μg/ml, LOQ value of 37,1094 μg/mL The precision of this analytical method were lower than2% for each of the sample, while method’s accuration for tofu was 98,69% ± 0,4085%. Results ofsample analysis from Ciputat market, samples were detected containing formaldehyde. Formaldehydeconcentrations are 104,87 μg/mL, 11,21 μg/mL, 1,96 μg/mL, 190,80 μg/mL, 201,98 μg/mL, 10,47μg/mL, and 3,31 μg/mL.

scholarly journals Development and Validation of Analytical Method for Determination of an Important Flavonoid in Malva neglecta

2019 ◽  
pp. 1-8
Author(s):  
Naira Nayeem Akmal ◽  
Mohd. Imran ◽  
Mohammad Ali Mujtaba
Keyword(s):  
Quality Control ◽  
Calibration Curve ◽  
Analytical Method ◽  
Methanolic Extract ◽  
Hplc Method ◽  
Average Recovery ◽  
Acceptance Criterion ◽  
Development And Validation ◽  
Validation Of Analytical Method

Development of genuine and dependable analytical methods which profile marker phytoconstituents in   an extract containing a mixture of several components is a challenging task. A simple, rapid, precise, and reliable HPLC method was developed for quantification of quercetin from the methanolic extract of Malva neglecta. The estimation was carried out using Phenomenex Gemini-NX-5 µm C18 .The parameters  considered for validation were accuracy, precision, linearity and robustness. The calibration curve was found to be linear in a concentration range of 20–100 μg/mL.The correlation coefficient was r2=0.9996. The % average recovery of quercetin was found to be in the range of 99.82 to 100.52% which was within the acceptance criterion indicating the accuracy of the method. The results of the robustness study indicated that there is no influence of minor changes. The developed and validated method can be successfully used for the determination of quercetin in Malva neglecta; thereby helping in authentication and quality control of this plant.

scholarly journals PENGARUH PENDAPATAN DAN SUKU BUNGA TERHADAP KEPUTUSAN PENGAMBILAN KPR PADA PT BANK TABUNGAN NEGARA (PERSERO) TBK CABANG PRABUMULIH

2020 ◽  
Vol 5 (2) ◽  
pp. 53-72
Author(s):  
Emi Sukmawati
Keyword(s):  
Linear Regression ◽  
Interest Rates ◽  
Hypothesis Testing ◽  
Multiple Linear Regression ◽  
Analytical Method ◽  
Random Sampling ◽  
Sampling Method ◽  
T Test ◽  
Coefficient Of Determination

This study is entitled "The Effect of Income and Interest Rates on the Decision of Taking Mortgages at PT Bank Tabungan Negara (Persero) Tbk Prabumulih Branch". The main problem in this research is how much income and interest rates influence the decision to take KPR at PT Bank Tabungan Negara (Persero) Tbk Prabumulih Branch. Determination of the sample in this study is to use the accidental sampling method, namely random sampling. The number of samples studied were 100 respondents who worked, both as private employees, BUMN employees, and Civil Servants (PNS) who were classified based on the income they received per month. The analytical method used is multiple linear regression with hypothesis testing using the F test, t test, and the coefficient of determination (R2). The results of this study concluded that income and interest rates influence the decision to take a mortgage at PT. Bank Tabungan Negara (Persero) Tbk Branch Prabumulih of 46.8%. Researchers give advice, companies engaged in housing should really pay attention to what factors are very influential in determining the buyer's decision to take a mortgage so that companies avoid unwanted problems, such as bad loans

PERILAKU KONSUMEN SAWI (Brassica Juncea L) PADA BEBERAPA PASAR TRADISIONAL DI KOTA KUPANG PROVINSI NUSA TENGGARA TIMUR

2020 ◽  
Vol 21 (2) ◽  
pp. 168-179
Author(s):  
Veby Kadji ◽  
Damianus Adar ◽  
Maximiliam M. J. Kapa
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Secondary Data ◽  
Primary Data ◽  
Sales Volume ◽  
White Mustard ◽  
Traditional Markets ◽  
The Third ◽  
Traditional Market

This research has been carried out in the Oeba Traditional Market and Naikoten Traditional Inpres market in October to November 2017. The aim is to find out: (1) Purchase Volume of Mustard Consumer; (2) the preferred type of mustard; (3) identify the factors that influence the demand of mustard consumers; (4) Mustard Sales Volume. The method used in this research is survey. Determination of the location of research carried out by purposive sampling. Respondents were determined as many as 120 people. The type of data collected is primary data and secondary data. To answer the first and fourth objectives, the data were analyzed descriptively qualitatively, answering the second goal using a Likert scale and the third objective of the data analyzed using multiple linear regression. The results showed that; (1) Of the 5 types of mustard the lowest purchase volume is dominated by curly mustard, namely the frequency of purchases per week 1-2 times with a volume of 1 kg - 2 kg. (2) The results of the study of 60 respondents, namely: 30 respondents in traditional traditional markets in Naikoten and 30 respondents in traditional Oeba markets, there are 3 types of mustard which are included in the Average category, namely curly mustard greens, and white mustard, and 2 types of mustard which are included in Like categories namely: mustard huma, and mustard caisim. (3) together - all factors significantly influence the demand for mustard greens shown by the F-count (14.895)> F-table (2.54) is significant at α = 5%. While the results shown by t-count which significantly influence α = 5% are Consumer Taste, and Holidays / Holidays. While the price of mustard greens, other vegetable prices, consumer income, the number of family members, the volume of mustard greens prepared by traders does not significantly affect the demand for mustard. (4) The lowest sales volume of mustard is dominated by Curly mustard, that is 9 respondents or 5% who sell with a volume of 22 - 42Kg / week

Determination of Limits for a Linear Regression or Calibration Curve

1983 ◽  
Vol 15 (3) ◽  
pp. 118-125 ◽  
Author(s):  
William H. Swallow ◽  
J. Richard Trout
Keyword(s):  
Linear Regression ◽  
Calibration Curve

scholarly journals Kinetic determination of tannic acid using a Belousov-Zhabotinskii oscillating system catalyzed by a macrocyclic complex

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Tingting Liu ◽  
Yangyang Chen ◽  
Gang Hu ◽  
Xiaofeng Shen ◽  
Jimei Song ◽  
...  
Keyword(s):  
Linear Equation ◽  
Tannic Acid ◽  
Calibration Curve ◽  
Analytical Method ◽  
Accurate Determination ◽  
Macrocyclic Complex ◽  
Kinetic Determination ◽  
Simple Instrument ◽  
Tetraazamacrocyclic Complex

AbstractAn analytical method for the determination of tannic acid is proposed by the sequential perturbation caused by different amounts of tannic acid on the Belousov-Zhabotinskii oscillating system. The oscillating system is catalyzed by tetraazamacrocyclic complex [CuL](ClO4)2, where L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. The method relies on the linear relationship between the changes in the inhibition time and the logarithm of the concentration of tannic acid. The calibration curve obeys a linear equation very well when the concentration of tannic acid is over the range of 6.25 × 10-7 ~ 1.56 × 10- 5 M (n = 16, R = 0.9984). This analytical method, equipped with a simple instrument, provides a new way to accurate determination of tannic acid.

scholarly journals Analysis of Influencing Factors and Volatility of Broiler Meat Prices in Pasuruan Regency, East Java Province

2020 ◽  
Vol 44 (4) ◽  
Author(s):  
Hariadi Subagja ◽  
Durrotun Nikmah
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Influencing Factors ◽  
Analytical Method ◽  
Price Volatility ◽  
Secondary Data ◽  
Broiler Meat ◽  
Meat Price ◽  
Beef Prices

The research was aimed to analyze of broiler meat price fluctuation, identify the factors competitor foodstuffs price that influence of broiler meat price, and identify alternative foodstuffs of broiler meat at consumer level in Pasuruan. The determination of location was did deliberately with consideration that in 2013, the production of broiler meat in Pasuruan was fourth highest production after Malang, Sidoarjo and Jombang , it was 8,842 million kg. This research was used secondary data from January 2010 until November 2015. The analytical method used is the price volatilitass analysis and multiple linear regression. The results showed that the value of broiler meat price volatility in Pasuruan tend to be small (low volatility) and happen quickly. Factors competitor foodstuffs price that influence the price of broiler meat in Pasuruan simultaneously influenced by the price of local chicken meat, beef prices, the price of eggs, and prices of salted anchovies fish. While partially, broiler meat prices at the consumer level in Pasuruan influenced by the price of beef and the price of eggs. The relation between the both showed that: broiler meat is alternative foodstuffs for beef, eggs are alternative foodstuffs for meat broiler, salted anchovies fish is complements for broiler meat.  

Infrared Determination of Sorbic Acid in Foods

1965 ◽  
Vol 48 (4) ◽  
pp. 794-795
Author(s):  
George F Calloway ◽  
George Schwartzman
Keyword(s):  
Steam Distillation ◽  
Sorbic Acid ◽  
Collaborative Study ◽  
Food Product ◽  
Chloroform Extract ◽  
Food Samples ◽  
Infrared Method ◽  
Preliminary Study

Abstract Preliminary study of an infrared method for determination of sorbic acid in foods gave promising results. The procedure consists of steam distillation of the food product, extraction of the distillate with chloroform, and measurement of the infrared absorbance of the chloroform extract at 10 μ. Recoveries from 92 to 110% were obtained from 14 food samples spiked with 0.05–0.15% sorbic acid. A collaborative study is recommended.

COMPARISON OF VARIOUS METHODS FOR THE CHEMICAL ASSAY OF CORTICOIDS IN URINE

1955 ◽  
Vol 18 (4) ◽  
pp. 374-378
Author(s):  
Mogens Sprechler
Keyword(s):  
Calibration Curve ◽  
Periodic Acid ◽  
Reducing Power ◽  
Standard Technique ◽  
Phosphomolybdic Acid ◽  
Florisil Column ◽  
Chemical Assay ◽  
Chromatographic Procedure ◽  
Acid Reagent

SUMMARY Since 1949 about 10,000 urinary corticoid analyses have been performed routinely in our laboratory. The method used for this purpose was described in 1950 (Sprechler). We determine the corticoids which can be extracted from the urine with chloroform immediately after acidification to pH 1. The extract is washed with sodium hydroxide and water, a Girard separation is performed, and finally the reducing power of the ketonic fraction is measured by means of the phosphomolybdic acid reagent reaction. During the last few years two other chemical reactions have been used for comparison: The formaldehyde and the Porter-Silber method. After a thorough examination of the above methods a standard technique was followed. In the formaldehyde method a microdiffusion in a Conway unit was used instead of distillation of the formaldehyde following the oxidation with periodic acid. The calibration curve was corrected for loss of material by taking the standard doses of DOC through all the procedures of the method. A micromodification of the Porter-Silber method was chosen. Furthermore attempts were made to determine how specific the chromatographic procedure is in the determination of steroids in urinary extracts. For this purpose the Florisil column was used, and the technique described by Nelson & Samuels was followed. Finally we have investigated the glucuronide-bound corticoids in urine in a smaller series of objects.

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