Meter Colorimeter

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Quality monitoring of flavorings - essential for great tasting food

Various samples - several parameters
During quality monitoring of raw materials, intermediate and finished products for food flavorings, it is essential that the specific weight, refractive index and pH value are accurately determined. In addition, the color of the samples often has to be determined. These measurements are used for identity verification. They ensure that the correct raw materials have been used and that the correct product has been manufactured.

Most samples require the determination of several parameters. Therefore, it makes sense automate the process and determine all parameters in a single process. A vast range of different flavorings are used in the food industry, which means that flavoring manufacturers have to work with a large number of samples. In order to handle the flow of samples and results efficiently and reliably, sample changers are usually used, whereby the measurement results are transferred directly to ERP systems such as SAP. Measuring systems in which a computer controls several measuring devices from different manufacturers in addition to an autosampler have been used for several years to record and export results. Such solutions are usually developed at the customer's request and can therefore be very expensive.

LiquiPhysics - fully automatic - flexible - compact
METTLER TOLEDO designed the new LiquiPhysics Excellence density meters and refractometers with the strict requirements involved in the quality monitoring of flavorings in mind. They enable measuring devices to directly control external density oscillation and refractive index cells as well as METTLER TOLEDO SevenEasy pH meters without the need for a computer. If the color also needs to be determined, a Lovibond PFX colorimeter from Tintometer can even be connected directly to the devices. Depending on the number of samples, the LiquiPhysics Excellence measuring devices can be operated by powerful automation units to measure either individual samples or sample series. If bar codes are used for entering sample data, these can be read with a handheld scanner or automatically on the sample changer itself.

LabX2010 – Seamless integration into SAP
The LabX 2010 laboratory software enables the LiquiPhysics Excellence measuring systems to be integrated seamlessly into ERP systems. For operators of the measuring system there is only one minor difference. In contrast to conventional solutions, the measuring system is not operated on a PC: With LiquiPhysics Excellence, the PC is remote controlled via the measuring device. This allows the measurement of sample series to be started directly on the user-friendly touchscreen of the device. The PC does not have to be located in the direct vicinity of the measuring system - LabX 2010 performs the import of sample lists and data exports discretely in the background.

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About the Author

METTLER TOLEDO specializes in the area of precision instruments for professional use. METTLER TOLEDO laboratory instruments are used in research, scientific, drug discovery, and quality control labs, amongst many others in the pharmaceutical, chemical, food and cosmetics industries. METTLER TOLEDO comprehensive industrial solutions cover the various steps in a host of manufacturing processes at many of the same customers that laboratory serves. Solutions range from receiving raw materials through various manufacturing processes, in-line process control and end-of-line packaging control, to logistics and shipping. Increasingly, these solutions are fully integrated into the customer's IT environment, helping automate their workflows. In food retail, our offering for fresh food management ranges from receiving and pre-packaging, to in-store solutions for self-service departments, deli counters, and checkout terminals.

Is there a way to test the acidity of a solution without using an indicator or a pH meter?

I need to prove that a solution of NH4Fe(SO4)2.xH2O (where x represents the number of moles of water of crystallisation in one mole of the salt) is acidic, but I can't use an indicator or pH meter. Is there a chemical test I could perform?

It's difficult since any method you used could be called an 'indicator'.

I would mix the solution with sodium bicarbonate. If it fizzes, it's acidic.

Find other substances that react with acid. For example, anthocyanins, found in red and purple fruit and vegetables, will change colour in an acidic or basic solution. So, you can make a pH meter with a red cabbage, or cherries or blueberries.

The rest, I don't know.

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