The aim of this study was to compare the effects of roasting and enzyme pretreatments on the yield and quality of cold-pressed oils obtained from 3 poppy seed varieties (Ofis 3 (blue), Ofis 4 (yellow), Ofis 8 (white)). The oil recovery range was 21.89%-38.36% with cold pressing. The oily cakes (meal) contained 42-168 g/kg oil and 113-166.3 g/kg moisture after the cold pressing. Physicochemical and quality tests were conducted to evaluate and compare the efficacy of the pretreatments. Furthermore, fatty acid, sterol, and tocopherol compositions were determined. Oil recovery was enhanced by enzyme treatment in Ofis 3 (28.31%) and Ofis 8 (38.36%), while roasting enhanced oil yield in Ofis 4 (29.36%) samples. On the other hand, enzyme treatment caused some problems, like increases in free acidity and peroxide value. The other physicochemical properties and minor components of the oils were not significantly affected by the pretreatments. Furthermore, it was determined that the oily cakes can be a good source of protein. This study proved that higher quality poppy seed oil can be produced with acceptable yield by applying the cold pressing technique coupled with a preroasting process.

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SUMMARY:The sensory descriptions, aromatic profiles and consumer preferences of poppy seed oils produced from three poppy varieties (ofis3, ofis4, and ofis8) by cold pressing were studied. Roasting and enzyme treatments were applied to the seeds prior to cold pressing. In addition, 75 different volatiles were quantified by GC-MS analysis. A flavor profile analysis was made with 9 panelists and 12 terms were identified for the description of the oil. The results shown that, only earthy term scores were different among the seed varieties, while treatments have caused differences in roasted, hazelnut, hay and sweet aromatic terms. Roasting and enzyme treatments decreased hay and increased sweet aromatic values. The enzyme treatment of the poppy seeds enhanced fermented and waxy scores in the cold press oils. 1-hexanol, 2-heptanone, 2-pentanone, 2-pentyl furan, 3-ethyl-2-methyl 1,3-hexadiene, 2-(dimethylamino)-3-phenylbenzo[b]thiophene, 3-octen-2-one, 4-hydroxyphenylacetic acid, alpha-pinene, limonene, dimethyl sulfone, mercaptoacetic acid, hexanal and nonanal were quantified as the major volatiles in all treatment groups. Consumer test results indicated that roasted samples are more liked, and the yellow (ofis4) roasted sample was identified as the most preferred (53.55%) oil by consumers. This study provides the first sensory descriptive definitions and consumer preferences for poppy seed oils. KEYWORDS:Cold Press; Consumer Acceptance; Flavor Profile Analysis; Poppy seed Oil; Roasting; Volatiles RESUMEN: Aceites de semillas de amapola prensados en frio: Propiedades sensoriales, perfiles aromáticos y preferencias del consumidor. En este trabajo, se analizan las descripciones sensoriales, perfiles aromáticos y preferencias de los consumidores de aceites de semillas de amapola producidosmediante prensado en frío a partir de tres variedades (ofis3, ofis4, y ofis8).Previo al prensado en frío, a las semillas se aplicóuna fase de tostado y un tratamiento enzimático. Además del análisis GC-MS donde se cuantificaron 75 compuestos volátiles, el perfil del sabor,realizado con 9 panelistas,logra identificar 12 términos descriptores. Los resultados muestran que, solamente la puntuación del término "terroso" fue diferente entre las variedades de semillas, también los tratamientos provocan diferencias en los términos, tostado, avellana, heno y aromas dulces. El tostado y los tratamientos enzimáticos disminuyeron la puntuación de heno y aumentó los valores de aromático dulce. El tratamiento enzimático de las semillas de amapola mejora los valores de fermentado y cera en los aceites prensados en frío. Los principales compuestos volátiles cuantificados en todos los grupos y tratamientos fueron:1-hexanol, 2-heptanona , 2-pentanona, furano 2-pentilo, 3-etil-2-metil 1,3-hexadieno, 2-(dimetilamino)-3-fenilbenzo[b]-tiofeno, 3-octen-2-one, ácido 4-hidroxifenilacético, alfa-pineno, limoneno, dimetilsulfona, ácido mercaptoacé-tico, hexanal y nonanal. Los resultados de las pruebas de consumo indican que las muestras tostadas son las que más...

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