Diagnostic use of profieciency testing in dairy laboratory

Hanuš, Oto (author), Genčurová, Václava (author), Hering, Pavel (author), Klimeš, Miloš (author), Jedelská, Radoslava (author)

The composition of raw milk (RM) is important for milk recording, herd improvement, payment of milk and for quality evaluation. The reliability of routine analytical results is therefore significant. A mistake occurrence could jeopardize the efficiency of results. Milk laboratories (ML) perform the systems of analytical quality assurance. Proficiency tests are carried out usually by 10 RM samples with modified variability of components. At evaluation the system of Euclidian distance (Re=( 2+sd2)0,5) for participants order according to their analytical result reliability is used. Two specificaly modified types (designs) of systematic diagnostical graphs were constructed on the Re basis. The first type of flow diagnostical diagram for RM analysators is based on Shewhart s diagram principles for Re parameter (alternating system of result rendering before and after calibrations). The second type is based on analysator set comparisons before (proficiency test results) and after calibration (success of calibration) by Re. The opposite comparison is possible and valuable as well. It makes possible the diagnosis and incidental co-ordinating of the corrections in the case of the unconformity occurrence. The positive contributions of the developed diagnostic graphics system are expected to: - improvement of estimation of unconformity sources of RM routine analytical results, their origin and character; - determination and improvement of incidental result corrections and instrument repairs; - improvement of reliability of routine results of RM analyses in general.

• Language: English
• Keywords: milk, dairy laboratories, proficiency testing, quality
• Work type: Not categorized
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publisher: Biotehniška fakulteta
• Year: 2004
• Number of pages: Str. 37-42
• Numbering: Letn. 84, št. 1
• PID: 20.500.12556/RUL-61696
• UDC: 637.1
• ISSN on article: 1581-9175
• COBISS.SI-ID: 1677960
• Publication date in RUL: 10.07.2015

Record is a part of a journal

• Title: Acta agriculturae Slovenica
• Shortened title: Acta agric. Slov.
• Publisher: Biotehniška fakulteta
• ISSN: 1581-9175
• COBISS.SI-ID: 213840640

Secondary language

• Language: Slovenian
• Title: Diagnostična uporaba preverjanja usposobljenosti mlekarskih laboratorijev

Abstract

Sestava surovega mleka (SM) je pomembna za kontrolo proizvodnje, selekcijo, plačevanje in vrednotenje kakovosti mleka. Zanesljivost rutinskih metod je ključnega pomena, ker bi napake ogrozile verodostojnost rezultatov. Mlekarski laboratoriji vpeljujejo sisteme za zagotavljanje kakovosti analitskih postopkov. Preverjanje usposobljenosti se izvaja navadno na 10 vzorcih SM z različno vsebnostjo osnovnih sestavin. Za preverjanje zanesljivosti analitskih rezultatov se pogosto uporablja sistem Evklidskih distanc (Re=( 2+sd2)0,5). Na osnovi Re sta bili zasnovani dve modifikaciji modela diagnostičnih grafov. Prvi tip diagramov poteka za analizo SM temelji na Shewhart ovem diagramu za parameter Re (sistem za določitev rezultata pred in po kalibraciji). Drugi tip temelji na primerjavi serij rezultatov pred in po kalibraciji z uporabao Re. Primerjava omogoča diagnozo in korekcije v primeru neskladja rezultatov. Od razvoja diagnostičnega grafičnega sistema si obetamo izboljšano določitev virov in narave neskladnosti analitskih rezultatov rutinske kontrole sestave SM, izboljšanje in korekcij rezultatov in instrumentov ter izboljšanje zanesljivosti rutinski rezultatov analize SM na splošno.

• Keywords: mlekarstvo, laboratoriji, usposobljenost, preverjanje, mleko, kakovost