Sensory analysis and instrumental measurements of short-term stored tomatoes (Lycopersicon esculentum Mill.).
Helga Auerswald, Peter Peters, Bernhard Bruckner, Angelika Krumbein and Rolf Kuchenbuch
Postharvest biology and technology. Vol: 15 Issue: 3 Pages: 323-334.
1999
บทคัดย่อ
The effect of short-term storage of tomatoes (air temperature 20 degrees C, relative air humidity 55%, air velocity <0.1 m s(-1) ) harvested red on the sensory, chemical and physical characteristics was examined on the fourth and seventh day of storage as well as their correlations. Quantitative descriptive analyses (QDA) with 57 attributes were carried out and consumer preference in eight characteristics was outlined. Chemical analyses were referred to fruit content of reducing sugars and titratable acid, the physical measurements included color values, deformation and loss of fresh matter. The aim of such examinations was to find out, if the quality of red harvested tomatoes could be sustained long enough under typical retailers and home conditions, which kind of changes took place and were accepted by the consumer. Until the fourth postharvest day, more than one third of the QDA's sensory attributes as well as the physical and chemical characteristics (except content of reducing sugars) were subject to significant changes. Only the sensory attributes 'mouldy' and 'pulpy' as well as the physical dimension deformation increased constantly up to the seventh day. Significant relations were found between the content of acid and attributes of the QDA to smell, flavor and aftertaste (sour, tomato-like, sweet, spoiled sweetish, mouldy). Likewise significant relations were outlined between fruit deformation and descriptive mouthfeel attributes fruit flesh pulpy and fruit flesh firm. The consumers valued 4 and 7 days stored tomatoes in the characteristics first impression, appearance, smell, flavor, aftertaste and mouthfeel equal or better than fresh harvested tomatoes. In overall impression 7 days stored fruits found the lowest acceptance, but they were not rejected. Between the hedonic judgement of consumers of the characteristic firmness whilst chewing and the results of QDA's attributes of mouthfeel significant relations were found.