Lumex Instruments applications

Introduction

The method is used for the determination of the mass fraction of free methionine, threonine, and tryptophan in fodder additives.

To provide the proper conditions for silage or haylage storage in agriculture it is necessary to regularly monitor the formation of certain organic acids in it. For example, the formation of butyric acid can indicate spoiling of material. Formic or propionic acids can be artificially added to increase the nutritional quality. The same materials and some other biodegradable waists (agricultural residues, sewage sludge, etc.) are also used in biogas plants, where the fermentation process must be carefully monitored, in particular, by the determining the certain organic acids. The present method allows determination of some important organic acids like acetic, lactic, butyric, propionic, and formic in feedstuff additives, silage, haylage and in different biodegradable materials of biogas plants. Some other organic acids (oxalic, fumaric, etc.) can be also determined within this method. 

The method enables fast quantitative determination in feeds, mixed fodders, and raw materials of the following amino acids: arginine, lysine, tyro sine, phenylalanine, histidine, leucine and iso -leucine (total), methionine, valine, proline, alanine, glycine, cystine, tryptophan, aspartic and glutamic acids.

Since during the sample decomposition asparagine and glutamine are hydrolyzed to aspartic and glutamic acids, respectively, the content of these two acids represents the total content of both the acids and the amides.

The organic acids profile in wine is a highly informative parameter since it reveals important features of the whole technological process. It is also one of the most important criteria for wine authentication. In spirits like cognac, brandy or whiskey, the presence of certain organic acids can indicate the violation of distillation or maturation processes or reveal the tendency to precipitate during storage. Some organic acids (sorbic, benzoic, ascorbic) can serve as preservatives; their presence is strictly regulated. Although the presence of sorbic acid in alcoholic beverages can be natural in some cases, in other cases it can indicate severe violation of the technological process or even complete falsification. 

Introduction

The method is used for the determination of the mass fraction of caffeine and theobromine in tea and tea products, coffee and coffee products, cocoa and cocoa products, and dietary supplements.

Introduction

Fungicide Carbendazim (Mercazole, Carbendazole) is widely used in agriculture to exterminate black mold (spot) on orange trees and treat fungus diseases of other fruit-bearing plants. According to the data of the World Health Organization, Carbendazim is toxic for liver, impacts reproductive system, and is considered to be a potentially cancerogenic compound. In most of the developed countries, the residual content of this fungicide is subject to national and international regulations. Researchers of LUMEX INSTRUMENTS, Ltd. have developed an analytical procedure for determination of the Carbendazim content in orange and other citrus juice produce using a capillary electrophoresis system CAPEL-105?.

INTRODUCTION

Free forms of amino acids in beer originate mostly from malt. The following method enables fast quantitative determination in beer and wort of the following free amino acids: arginine, lysine, tyrosine, phenylalanine, histidine, leucine and iso-leucine (total), methionine, valine, proline, alanine, glycine, cystine, tryptophan, aspartic and glutamic acids. Total content of amino acids is fdetermined after hydrolysis of proteins.

The method is used for measuring the concentrations of caffeine, ascorbic acid, preservatives (sorbic and benzoic acids and their salts) and sweeteners (acesulfame К, saccharin and its salts) in soft and alcoholic drinks.

The presence or absence of aromatic aldehydes (vanillin, sinapic, coniferyl and syringic aldehydes) in a sample and also their weight content and proportion allows determination of authenticity and quality of brandies and brandy spirits, and revealing a counterfeit. Together with aromatic aldehydes, it is possible to determine phenolcarbolic acids, such as sinapic, syringic, ferulic, salicylic, cumaric, vanillic, ellagic, p-hydroxybenzoic, caffeic, gallic, protocatechuic. Identification and weight content of these acids is an additional criterion of the spirit authenticity. 

Method allows determination of mass concentration of total sulfur dioxide (sulfurous acid and its salts, food additives E220–E228) in wine, wine materials, beer and beer products by capillary electrophoresis (CE) using capillary electrophoresis system “CAPEL® -105M”. The mass concentration of total sulfur dioxide is regulated by normative documents to be held within 100– 400 mg/L for different types of wine and wine materials and within 20–50 mg/L for beer products. According to European and Russian regulations it is allowed not to indicate on the labels the presence of sulfur dioxide in beverages if its concentration is less than 10 mg/L. 

In order to maintain high quality of milk products, it is necessary to monitor process quality as rapidly as possible, so that a relevant technological process could be promptly corrected. The most important quality factors of milk products are fat, protein, moisture (total solids), SNF, sugar, salt, lactose and titrated acidity. Commonly, it takes a few hours to make such type of analyses by traditional methods. The use of an InfraLUM® NIR analyzers reduces the analysis time to a couple of minutes. 

The method is based on measuring the transmission spectrum of a sample in the near-IR spectral region and subsequent determination of the analyzed parameters/constituents using a calibration model. Transmission measurement provides highest accuracy and reproducibility of the measurements. 

It is important to quantify α- and β-hop acids (humulons and lupulons) as well as bitter iso- α-acids (isohumulons) on the all stages of beer production. Hop acids are the biochemical markers of a certain hop type. Bitter iso- α-acids stabilize the beer foam, suppress the growth of undesirable microorganisms and give the beer its bitter taste. 

For the manufacturers of edible oils it is very important to control the crushing process at all the stages to achieve the best cost efficiency. In order to provide maximum yield and meet the product specifications it is necessary to monitor process as closely and rapidly as possible. Rapid determination of the key parameters with the use of InfraLUM® NIR analyzers provides the opportunity to control the process at every stage from quality control of oilseeds at intake point to the QC of the final product (liquid or solid). 

In order to maintain high quality of milk products, it is necessary to monitor process quality as rapidly as possible, so that a relevant technological process could be promptly corrected. The most important quality factors of milk products are fat, protein, moisture (total solids), SNF, sugar, salt, lactose and titrated acidity. Commonly, it takes a few hours to make such type of analyses by traditional methods. The use of an InfraLUM® NIR analyzers reduces the analysis time to a couple of minutes.

Various food additives – preservatives (benzoic acid, sorbic acid, and their salts), sweeteners (Acesulfame K, saccharine and its salts) and others are widely used in food industry for the improvement of food products properties and extension of storage life. The amount of these additives in food products is regulated by technical instructions and other norms.