scholarly journals Research on the Impact of Temperature on Change in Olive Oil Quality

2020 ◽  
Vol 6 (2) ◽  
pp. 249-259
Author(s):  
Paula Sliva ◽  
Marinela Mandić ◽  
Jasna Bošnir ◽  
Sonja Serdar ◽  
Anna Pierobon ◽  
...  

Maslinovo ulje visokovrijedna je i kvalitetna namirnica te osnova svake mediteranske prehrane, ali i šire. Sama kvaliteta maslinova ulja, osim načina proizvodnje, uvjetovana je i načinom čuvanja. Svjesni smo činjenice da su maslinova ulja često izložena utjecaju svjetlosti i visokim temperaturama, koje znatno mogu utjecati na njegovu kvalitetu, kako kod proizvođača i distributera tako i kod samih potrošača. Cilj je ovoga rada u laboratorijskim uvjetima simulirati uvjete temperaturnih režima te duljine ekspozicije maslinovih ulja, prateći njihov utjecaj na parametre kvalitete ulja kao što su ukupna kiselost ulja, peroksidni broj, K-broj te promjenu sastava masnih kiselina, uključujući i promjenu senzorskih svojstava. Analizama je utvrđeno da temperatura i način skladištenja imaju znatan utjecaj na promjenu kvalitete ulja, osobito kada je riječ o ukupnoj kiselosti ulja i peroksidnom broju. Stoga je od iznimne važnosti da se ulje skladišti u prikladnoj ambalaži, odnosno tamnim staklenim bocama te da se skloni od utjecaja direktnih Sunčevih zraka i visoke temperature.

2017 ◽  
Vol 119 (1) ◽  
pp. 190-214 ◽  
Author(s):  
Samir Sayadi ◽  
Yamna Erraach ◽  
Carlos Parra-López

Purpose The purpose of this paper is to translate consumer requirements regarding olive-oil quality attributes into specific olive-growing practices that most contribute to satisfy these attributes. Design/methodology/approach After identifying consumer requirements or needs regarding different attributes of olive-oil quality, through a survey of 439 olive-oil consumers, the authors determine the olive-growing practices that optimally satisfy consumer needs through expert opinions. Finally, the use of expert knowledge to construct the House of Quality or the first matrix of quality function deployment allow the authors to define the relative contribution of the various olive-farming practices to the satisfaction of consumer requirements. Findings The findings have shown that the olive-oil quality attributes most requested by consumers incorporate organoleptic (e.g. acidity, flavour, colour), sociocultural (e.g. creating employment in rural areas, maintenance of the rural population) and environmental ones (environmental externalities). The “separation of olives collected from ground and trees” (separation), “timing of harvesting” (according to a fruit-ripeness index), the “method of the ground harvest” (no picking from the ground), and the “method of tree harvest” (handpicking) were some of the most commonly identified olive-farming practices that contribute the most to meeting consumers’ needs with regard to olive-oil quality. Research limitations/implications The study suggests detailed analyses of the relationships between customer requirements and other agents practices involved in the olive sector (processing industries: mills, distribution, and marketing management, etc.) to more fully investigate the impact of all these practices on consumers’ perceived olive-oil quality attributes. This is the most reliable way to guarantee that the most sought-after quality characteristics are taken into account, not only in the farming stage but also in the various different stages of the olive agri-food chain. Practical implications Findings represent an opportunity in the market value chain to develop a quality olive oil which is more oriented towards the consumer and able to face future segmentations in the market. This is one of the main innovative features of this study, as it offers “good practice” guidelines to agents of the olive-oil sector from the consumer perspective. Social implications This study provides positive implications to consumers, providing them important tools to make an informed choice, and producers and marketers helping the design of production strategies to optimally satisfy the consumer preference with regard to olive-oil quality, and attain a competitive advantage by adding value to the product. Originality/value This paper is regarded as the pioneer in the literature translating the “consumer voice” regarding olive-oil quality into specific olive-growing practices “good-practices guidelines”. Thus, the relevant required quality olive-oil attributes should be clearly described on the label, to enable consumers to identify the quality features and make an informed choice. Furthermore, to meet consumers’ needs, the olive-oil sector should focus on the olive-growing practices that optimally satisfy consumer requirements concerning olive-oil quality attributes. This would help to improve legitimacy and boost public support for the Common Agricultural Policy subsidies for the agricultural sector in general, and the olive sector in particular. The findings are particularly valuable in helping policy makers to design marketing strategies to improve the sustainability and competitiveness of Spanish olive oil.


2016 ◽  
Vol 40 (3) ◽  
pp. e12489 ◽  
Author(s):  
Lorenzo Guerrini ◽  
Ottorino Luca Pantani ◽  
Alessandro Parenti

2021 ◽  
Vol 141 ◽  
pp. 322-329
Author(s):  
Jihed Faghim ◽  
Mbarka Ben Mohamed ◽  
Mohamed Bagues ◽  
Kamel Nagaz ◽  
Tebra Triki ◽  
...  

Agriculture ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 674
Author(s):  
Nawaf Abu-Khalaf

An electronic nose (EN), which is a kind of chemical sensor, was employed to check olive oil quality parameters. Fifty samples of olive oil, covering the four quality categories extra virgin, virgin, ordinary virgin and lampante, were gathered from different Palestinian cities. The samples were analysed chemically using routine tests and signals for each chemical were obtained using EN. Each signal acquisition represents the concentration of certain chemical constituents. Partial least squares (PLS) models were used to analyse both chemical and EN data. The results demonstrate that the EN was capable of modelling the acidity parameter with a good performance. The correlation coefficients of the PLS-1 model for acidity were 0.87 and 0.88 for calibration and validation sets, respectively. Furthermore, the values of the standard error of performance to standard deviation (RPD) for acidity were 2.61 and 2.68 for the calibration and the validation sets, respectively. It was found that two principal components (PCs) in the PLS-1 scores plot model explained 86% and 5% of EN and acidity variance, respectively. PLS-1 scores plot showed a high performance in classifying olive oil samples according to quality categories. The results demonstrated that EN can predict/model acidity with good precision. Additionally, EN was able to discriminate between diverse olive oil quality categories.


2014 ◽  
Vol 4 (4) ◽  
Author(s):  
Maurizio Caciotta ◽  
Sabino Giarnetti ◽  
Fabio Leccese ◽  
Barbara Orioni ◽  
Marco Oreggia ◽  
...  

2012 ◽  
Vol 114 (5) ◽  
pp. 535-541 ◽  
Author(s):  
Sara Godena ◽  
Alessandra Bendini ◽  
Elisa Giambanelli ◽  
Lorenzo Cerretani ◽  
Damir Ðermić ◽  
...  

2010 ◽  
Vol 58 (23) ◽  
pp. 12469-12472 ◽  
Author(s):  
Mokhtar Guerfel ◽  
Chokri Zaghdoud ◽  
Khaled Jebahi ◽  
Dalenda Boujnah ◽  
Mokhtar Zarrouk

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