Browsing by Author "Blanckenberg, Anelle"
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- ItemPreference of Western Cape Province consumers for the eating quality and appearance of pears(Stellenbosch : Stellenbosch University, 2015-12) Blanckenberg, Anelle; Steyn, Willem J.; Theron, K. I.; Muller, M.; Stellenbosch University. Faculty of Agriscience. Dept. of Horticulture.ENGLISH ABSTRACT: Our study aimed to determine the preference of Western Cape consumers for the eating quality and appearance of pears. Identifying the main sensory drivers of liking and consumer groupings with similar preferences may allow the pear industry to target specific markets and increase local consumption, which is stagnating at relatively low levels. Our first trial included 9 European pear cultivars (Pyrus communis L.) and one Asian pear cultivar (P. pyrifolia (Burm.) Nak.). These were chosen to represent a wide range of characteristics in order to identify the main sensory drivers of liking and possible consumer groupings. The majority of the 421 consumers, irrespective of gender, ethnicity and age, preferred pears with a distinct pear flavour, a sweet taste, a fair amount of malic acid, soft, juicy flesh with melt character, and a yellow or pale green peel colour with a typical pear shape. Astringency, sourness and grittiness negatively affected consumer preference. None of the pears were mealy and therefore we could not assess this characteristic. Two consumer clusters with similar preferences for eating quality and also for appearance were identified. In terms of eating quality, group 1 (55% of consumers) indicated a liking for a wide range of cultivars with poorly defined likes and dislikes. Group 2 (45% of consumers), in contrast, had a high liking for the eating quality of a small selection of cultivars while disliking the rest. Based on the preferences for appearance, group 1 (61% of consumers) again indicated a liking for a wide range of cultivars. Group 2 (39% of consumers) scored the most familiar cultivars, viz. Bon Chretien and Packham’s Triumph, very high and the other cultivars much lower than group 1. The objective of our second study was to investigate consumer preference for firm, juicy pears compared to soft pears with a melt character and to identify which of ‘Forelle’, ‘Packham’s Triumph’ and ‘Abate Fetel’ is best suited to either option. Pears were harvested within the commercial harvest window (H1) (flesh firmness at 6- 6.8kg, 6.4-7kg and 6-6.8kg respectively) and again a month later (H2). H1 and H2 pears were ripened at room temperature (20 ºC) for seven or one day, respectively. More consumers (67%) correlated positively with melt character, juiciness, overall pear flavour and sweet taste. These characteristics were the most prominent in H1 ‘Packham’s Triumph’ pears while H2 fruit were much firmer, but lower in preferred flavour characteristics. There is, however, also a market for crisp and juicy pears as 33% of the consumers showed a preference for these characteristics. ‘Forelle’ and ‘Abate Fetel’ could both be suitable for this market. ‘Forelle’ was preferred firm, probably because H1 soft pears were more astringent and sour as well as less juicy than H2. There was no difference in preference between H1 and H2 in ‘Abate Fetel’. In conclusion, most Western Cape consumers prefer European pears with the characteristic soft, melting texture, but a third of consumers seem to like firm, juicy pears. Hence, there is opportunity to develop a market for tree-ripe and Asian pears, but marketing will be needed to overcome appearance preferences.
- ItemQuantity and quality losses of 'Crimson Seedless' grape and 'Packham's Triumph' pear along the supply chain and associated impacts(Stellenbosch : Stellenbosch University, 2022-04) Blanckenberg, Anelle; Opara, Umezuruike Linus; Fawole, Olaniyi Amos; Stellenbosch University. Faculty of AgriSciences. Dept. of Horticulture.ENGLISH ABSTRACT: Postharvest loss and waste (often referred to as wastage) is a global problem affecting all produce along the supply chain from farm to plate. These losses not only decrease food supply but also mean that huge amounts of the resources and effort used in the production of horticultural crops are squandered. From an economic perspective, addressing postharvest losses is not only helpful to producers aiming to sell more, but also to consumers who could save money as the available food becomes more affordable. To date, there is little scientific data available on the incidence and magnitude of postharvest losses of fruit and other food crops in South Africa. The aims of this study were to assess postharvest losses in quantity and quality of ‘Crimson Seedless’ table grape and ‘Packham’s Triumph’ pear along the supply chain and quantify the associated economic, environmental and resource impacts in order to inform mitigating actions. The base measurement for table grape losses occurred in the packhouses of four farms in the Western Cape during the commercial harvest. The highest quantity (%) of physical losses in the supply chain was found to occur at this level when compared to the cold storage (2 or 4 weeks at -0.3°C ± 0.7°C and 81.3% ± 4.1% RH), retail (10 days at 5.4°C ± 0.6°C and 83.7% ± 2.9% RH) and consumer/home (ambient) storage (25.1 ± 1.3°C and 46.6 ± 6.0% RH) stages. There were large differences between the 2017 and 2018 seasons, with the 2018 season’s losses being half that of the first. The main reason for losses at the packhouse level was mechanical damage (7.1% in 2017 and 3.09% in 2018) due to rough handling of crates and could be improved by making workers more aware of the necessity to handle crates with care. Harvest timing is also essential, as delayed harvesting reduces shelf life and increases postharvest losses, as evidenced by this research. The farm that sustained the highest losses in 2017 (23.3%) harvested later than was optimal, and therefore, the bunches stayed on the vines too long. In 2018 the harvest occurred two weeks earlier than in 2017, and the grapes were in better condition leading to fewer losses on farm level (5.85%). Among all supply chain scenarios, the main quality problem was rachis and stem browning at temperatures higher than -0.5ºC. This caused berries to drop faster and bunches to look less fresh, as well as causing bunches to weigh less when sold. While 500 g and 1 kg punnets are routinely kept at around 5ºC at the retail level, during peak season 4.5–10 kg cartons are often stacked on the floor under ambient conditions. Therefore, the table grapes would have a maximum shelf life of seven days before the stems have browned and too many berries per bunch are decayed to sell. Therefore, it is advisable to keep cartons at -0.5ºC and high RH and only place bunches in punnets in 5ºC display fridges as the stock sells. The base measurement for losses of pear occurred in the orchard of two farms in the Western Cape during commercial harvest. It was found that 18% of the harvest on the one farm and 19% of the harvest on the other, did not reach the minimum quality standards. The main reasons were deformed fruit and too small size. The only decay, among all supply chain scenarios, occurred when pears were kept under ambient conditions (25.1 ± 1.3°C, 46.6 ± 6.0% RH) where 3.3% were decayed after seven days and 6.6% after 10 days. The majority of physical losses were due to weight loss with a 3.9%, 3.6 and 3.7% decrease in weight for supply chain Scenario B (to local retail markets), supply chain Scenario C (to export retail markets) and supply chain Scenario D (simulated ‘abusive’ treatment of fruit within the export chain) respectively. . Of the data gaps in the existing knowledge on global food loss and waste, the largest gap is the lack of available data on postharvest losses, retail and household level (shelf-life) food waste data. Therefore, this study contributed to the advancement of new knowledge by generating primary data on postharvest quantity and quality losses along the supply chain to manage the food loss and waste problem better.