title: Measuring milk fat content by random laser emission.
abstract: The luminescence spectra of milk containing rhodamine 6G are shown to exhibit typical signatures of random lasing when excited with 532 nm laser pulses. Experiments carried out on whole and skim forms of two commercial brands of UHT milk, with fat volume concentrations ranging from 0 to 4%, presented lasing threshold values dependent on the fat concentration, suggesting that a random laser technique can be developed to monitor such important parameter.
authors.affiliation: Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristovão, SE, Brazil.
authors.forename: Luis M G
authors.initials: LM
authors.lastname: Abegão
authors.affiliation: Departamento de Tecnologia de Alimentos, Universidade Federal de Sergipe, 49100-000 São Cristovão, SE, Brazil.
authors.forename: Alessandra A C
authors.initials: AA
authors.lastname: Pagani
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970 São Carlos, SP, Brazil.|Instituto de Física, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, 38400-902 Uberlândia, MG, Brazil.
authors.forename: Sérgio C
authors.initials: SC
authors.lastname: Zílio
authors.affiliation: Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristovão, SE, Brazil.
authors.forename: Márcio A R C
authors.initials: MA
authors.lastname: Alencar
authors.affiliation: Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristovão, SE, Brazil.
authors.forename: José J
authors.initials: JJ
authors.lastname: Rodrigues
mesh_terms: D000818:Animals; D004041:Dietary Fats / Q000032:analysis*; D005456:Fluorescent Dyes; D053844:Lasers, Solid-State; D008055:Lipids / Q000032:analysis; D008892:Milk / Q000737:chemistry*; D061352:Pasteurization / Q000379:methods; D012235:Rhodamines; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D004041:Dietary Fats; D005456:Fluorescent Dyes; D008055:Lipids; D012235:Rhodamines; C026188:rhodamine 6G