Avaliação do limite de detecção dos métodos qualitativos oficiais de análise de constituintes de densidade em leite

Abstract

Milk is an important food for humans. Due to its high nutritional value, it is also widely consumed, thus highlighting its commercial value. Milk suffers several frauds, routine techniques were created to analyze and control its quality by checking the presence of chemical residues in this food. Milk fraud is designed to mask poor quality and is intended to increase profits from volume fraud to chemical preservatives. Density determination serves as a method for detecting milk fraud with regard to skimming or adding water. The addition of the replenishers to milk aims to recompose the appearance and some physicochemical characteristics of milk this often occurs from the addition of H2O, sodium chloride, starch and sucrose. The objective of this work is to evaluate the detection limits of the official tests of qualitative analysis of chemical residues in milk, used as density replenishers. Analyzes made using In Natura milk, applying the official methodologies of analysis, available in Normative Instruction No. 68 with a negative sample for the presence of reconstituents and within the parameters established by the legislation. The detection limit of the reconstituents was 0.01% sodium chloride, 0.05% starch and 0.22% sucrose. Due to technological advances and relevance of milk in human food, it is of great importance to reassess the methodologies employed to detect fraud in order to improve it. Thus, this work consisted in qualitatively determining the detection limits for substances used to defraud milk, in order to verify whether or not part of the official Brazilian qualitative techniques are safe.