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肉禽类

Sensory based quality control utilising an electronic nose and GC-MS analyses to predict end-product quality from raw materials

1.Introduction

In food production plants there is a growing demand foron-line/at-line measurement of sensory relevant quality criteria. One promising technology in this capacity is the application of an electronic nose. Most of the commercially available electronic noses are, however developed for the laboratory context. The electronic nose applied in this experiment is avers atile instrument under development foron-line/at-line analysis in food quality assessment, environmental odours and other areas.

2.Materials and methods

2.1.Raw materials and meat loaf production

2.2.Sensory analysis

2.3.Instrumental analysis

2.4.Data analysis

3.Results and discussion

3.1.Raw materials

3.1.1.In-house sensory on raw materials

3.1.2.Volatile compounds in raw materials

3.1.3.Electronic nose analysis on raw materials

3.2.Meat loaf

3.2.1.In-house sensory on meat loaf


3.2.2.Sensory profiling of meat loaf

3.2.3.Volatile compounds in meat loaf

3.2.4.Electronic nose analysis of meat loaf


4.Conclusions

Overall, in the present study a linking of raw material sensory quality, the volatile compounds present and the
electronic nose measurements has been demonstrated. Moreover, indication sofheatin gunder high pressure was determined as the likely cause for the sensory deviation in the MRMsample, where as a breach in the cooling chain was the likely cause for the deviation in the sensory designated offfattrimmings and rind samples. Finally, the sensory designated deviations in raw materials resulted in unacceptable final products from a sensory perspective, providing contextual validity to the findings, i.e. linking of raw material quality to the sensory quality of the produced meat loaf. Although the in-house sensory detected the deviating raw materials using a form free choice profiling astrategyinvolvinganoperationalandstandardisedmethodologyandvocabularyforin-housesensoryevaluationof the raw
materialsisessentialiftheelectronicnoseistobecalibratedproperlyandusedonlineinthefuture.Thetermoperationalisusedtodenoteasetofsciencebasedandeasilycommunicatedsensorytermsdescribingkeyconsumerrelevantfeaturesofagivenrawmaterialinaqualitativeandquantitativemanner.