Abstract
Optimum harvest maturity is one of the important factors determining the quality of avocado fruit. Currently, avocado harvest maturity is mostly determined using markers or indices such as mesocarp oil, dry matter, or moisture content, all quantified destructively using representative samples of a batch in a consignment. Although useful, destructive techniques are time-consuming and results reflect properties of specific produce evaluated. High variation in maturity stages affect postharvest quality and the rate of ripening within a consignment, causing logistical difficulties. Emerging analytical techniques have particular advantages in non-destructive detection of food quality and safety. In this paper, destructive and non-destructive analytical methods and instruments for determining maturity parameters of avocado fruit are discussed. This review also looks at the trends in applying emerging optical and imaging techniques to the analysis of avocado fruit maturity and quality, in particular, visible to near infrared spectroscopy, ultrasonic system, ultrasound imaging, hyperspectral imaging, magnetic resonance imaging, and fluorescence imaging. On the basis of the observed trends, the technical challenges and future prospects for commercial application of these non-destructive techniques for maturity determination of individual avocado fruit are presented.
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Aleixos, N., Blasco, J., Navarron, F., & Molto, E. (2002). Multispectral inspection of citrus in real-time using machine vision and digital signal processors. Computers and Electronics in Agriculture, 33, 121–137.
Antonucci, F., Pallottino, F., Paglia, G., Palma, A., D’Aquino, S., & Menesatti, P. (2011). Non-destructive estimation of mandarin maturity status through portable Vis-NIR spectrophotometer. Food and Bioprocess Technology, 4, 809–813.
Arpaia, M. L., Boreham, D., & Hofshi, R. (2001). Development of a new method for measuring minimum maturity of avocados. California Avocado Society Yearbook, 85, 153–178.
Arpaia, M. L., Mitchell, F. G., Katz, P. M., & Mayer, G. (1987). Susceptibility of avocado fruit to mechanical damage as influenced by variety, maturity and stage of ripeness. South African Avocado Growers Association Yearbook, 10, 149–151.
Arpaia, M. L., Boreham, D., Collin, S., Fjeld, K., & Sievert, J. (2003a). Hass matury project. Proceedings of the California Avocado Research Symposium, 120–124.
Arpaia, M. L., Sievert, J., Collin, S., Fjeld, K., Coetzer, M., Stottlemyer, D. S., et al. (2003b). Avocado postharvest quality. Proceedings of the California Avocado Research Symposium, 125–139.
Arzate-Vázquez, I., Chanona-Pérez, J. J., Perea-Flores, M. J., Calderón-Domínguez, G., Moreno-Armendáriz, M. A., Calvo, H., et al. (2011). Image processing applied to classification of avocado variety Hass (Persea americana Mill.) during the ripening process. Food and Bioprocess Technology, 4, 1307–1313.
Avocados Australia Limited (2008). Avocados Australia new maturity standard: Interpretation and implications of dry matter consumer research for avocados. Talking Avocados, 19(4), 24. http://industry.avocado.org.au/Growers/documents/TalkingAvocadosSummer2008Vol19No4LR_000.pdf. Accessed 08 April 2015.
Avocado Certification Program (2014). Avocado information: minimum maturity standard. http://ucavo.ucr.edu/General/Maturity.html. Accessed 07 April 2015.
Barry, G. A., Brown, B. I., & Barker, L. R. (1983). The use of low resolution nuclear magnetic resonance for determining avocado maturity by oil content. Journal of Food Technology, 18, 401–410.
Blakey, R. B., Bower, J. P., & Bertling, I. (2009). Influence of water and ABA supply on the ripening pattern of avocado (Persea americana Mill.) fruit and the prediction of water content using near infrared spectroscopy. Postharvest Biology and Technology, 53, 72–76.
Blumenfeld, A., & Gazit, S. (1971). The role of the seed coat in avocado fruit developemtn (growth and maturation). California Avocado Society Yearbook, 54, 100–104.
Bora, P. S., Narain, N., Rocha, R. V. M., & Paulo, M. Q. (2001). Characterisation of the oil from the pulp and seeds of avocado (cv. ‘Fuerte’) fruits. Grasas y Aceites, 52, 171–174.
Bower, J., Van Rooyen, Z., Bertling, I., & Blakey, R. (2007). Variable ripening of fruit in avocado consignments. Proceedings of the Fourth World Avocado Congress, Viña Del Mar, Chile. 12–16 Nov. 2007. Presentation Abstract.
Carvalho, C. P., Velásquez, M. A., & van Rooyen, Z. (2014). Determination of the minimum dry matter index for the optimum harvest of ‘Hass’ avocado fruits in Colombia. Agronomía Colombiana, 32, 399–406.
Chanderbali, A. S., Soltis, D. E., Soltis, P. S., & Wolstenholme, B. N. (2013). Taxonomy and botany. In B. Schaffer, B. N. Wolstenholme, & A. W. Whiley (Eds.), The Avocado: Botany, Production and Uses (pp. 31–50). Oxfordshire, Oxford: CAB International.
Chen, P., McCarthy, M. J., Kim, S. -M., & Zion, B. (1996). Evelopment of a high-speed NMR technique for sensing maturit avocados. Transction of the American Society of Agricultural Engineering, 39, 2205–2209.
Chen, N. J., Wall, M. M., Paull, R. E., & Follett, P. A. (2009). Variation in ‘Sharwil’ avocado maturity during the harvest season and resistance to fruit fly infestation. Hortscience, 44, 1655–1661.
Chen, P., McCarthy, M. J., Kauten, R., Sarig, Y., & Han, S. J. (1993). Maturity evaluation of avocados by NMR methods. Journal of Agricultural Engineering Research, 55, 177–187.
Clark, C. J., White, A., Woolf, A., & Domijan, K. (2005). Can density sorting at harvest segregate mixed maturity of feijoa? Acta Horticturae, 687, 93–98.
Clark, C. J., Hockings, P. D., Joyce, D. C., & Mazucco, R. A. (1997). Application of magnetic resonance imaging to pre- and post-harvest studies of fruits and vegetables. Postharvest Biology and Technology, 11, 1–21.
Clark, C. J., McGlone, V. A., Requejo, C., White, A., & Woolf, A. B. (2003). Dry matter determination in ‘Hass’ avocado by NIR spectroscopy. Postharvest Biology and Technology, 29, 301–308.
Clark, C. J., White, A., Jordan, R. B., & Woolf, A. B. (2007). Challenges associated with segregation of avocados of differing maturity using density sorting at harvest. Postharvest Biology and Technology, 46, 119–127.
Cowan, A. (2004). Metabolic control of avocado fruit growth: 3-hydroxy-3-methylglutaryl coenzyme a reductase, active oxygen species and the role of C7 sugars. South African Journal of Botany, 70, 75–82.
Cox, K. A., McGhie, T. K., White, A., & Woolf, A. B. (2004). Skin colour and pigment changes during ripening of ‘Hass’ avocado fruit. Postharvest Biology and Technology, 31, 287–294.
Cubero, S., Aleixos, N., Moltó, E., Gómez-Sanchis, J., & Blasco, J. (2011). Advances in machine vision applications for automatic inspection and quality evaluation of fruits and vegetables. Food and Bioprocess Technology, 4, 487–504.
Degani, C., Bechor, V., Albazri, R., & Blumenfeld, A. (1986). Dry weight content as an index for determination of maturity of avocado fruits. Alon Hanotea, 40, 1017–1022.
Ding, H., Chin, Y. -W., Kinghorn, A. D., & D’Ambrosio, S. M. (2007). Chemopreventive characteristics of avocado fruit. Seminars in Cancer Biology, 17, 386–394.
Ding, H., Han, C., Guo, D., Chin, Y. -W., Ding, Y., Kinghorn, A. D., et al. (2009). Selective induction of apoptosis of human oral cancer cell lines by avocado extracts via a ROS-mediated mechanism. Nutrition and Cancer, 61, 348–356.
Dodd, M., Cronje, P., Taylor, M., Huysamer, M., Kruger, F., Lotz, E., et al. (2010). A review of the post harvest handling of fruits in South Africa over the past twenty five years. South African Journal of Plant and Soil, 27, 97–116.
Donetti, M., & Terry, L. A. (2014). Biochemical markers defining growing area and ripening stage of imported avocado fruit cv. Hass. Journal of Food Composition and Analysis, 34, 90–98.
FAOSTAT (2015). World avocado production. http://faostat3.fao.org/browse/Q/QC/E. Accessed 09 March 2015.
Flitsanov, U., Mizrach, A., Liberzon, A., Akerman, M., & Zauberman, G. (2000). Measurement of avocado softening at various temperatures using ultrasound. Postharvest Biology and Technology, 20, 279–286.
Fuchs, Y., Zauberman, G., & Lederman, E. I. (1995). Effect of postharvest treatmnents and storage conditions on avocado fruit ripening and quality. Proceedings of The Third World Avocado Congress, 323–330.
Gaete-Garretón, L., Varfas-Hern-Ndez, Y., Leơn-vidal, C., & Pettorino-Besnier, A. (2005). A novel non-invasive ultrasonic method to assess avocado ripening. Journal of Food Science, 70, 187–191.
Galili, N., Schmulevich, I., & Benichou, N. (1998). Acoustic testing of avocado for fruit ripeness evaluation. Transaction of the American Society of Agricultural Engineers, 41, 399–407.
Gamble, J., Harker, F. R., Jaeger, S. R., White, A., Bava, C., Beresford, M., et al. (2010). The impact of dry matter, ripeness and internal defects on consumer perceptions of avocado quality and intentions to purchase. Postharvest Biology and Technology, 57, 35–43.
Girod, D., Landry, J. A., Doyon, G., Osuna-Garcia, J. A., Salazar-Garcia, S., & Goenaga-Portela, R. J. (2008). Evaluating hass avocado maturity using hyperspectral imaging. Caribbean Food and Crops Society Proceeding, 44, 144–154.
Gómez-López, V. M. (1999). Characterization of avocado (Persea americana Mill.) varieties of low oil content. Journal of Agricultutral and Food Chemistry, 47, 2707–2710.
Gowen, A. A., O’Donnell, C. P., Cullen, P. J., Downey, G., & Frias, J. M. (2007). Hyperspectral imaging—an emerging process analytical tool for food quality and safety control. Trends in Food Science and Technology, 18, 590–598.
Guerrero, E. R. & Benavides, G. M. (2014). Automated system for classifying Hass avocados based on image processing techniques. 2014 I.E. Colombian Conference on Communications and Computing (COLCOM), Bogota, 4–6 June 2014, pp.1–6.
Hahn, F. (2002). Multi-spectral prediction of unripe tomatoes. Biosystems Engineering, 81, 147–155.
Harker, F. R., Jaeger, S. R., Hofman, P., Bava, C., Thompson, M., Stubbings, B., et al. (2007). Australian consumers’ perceptions and preferences for ‘Hass’ avocado. Horticulture Australia Ltd, Sydney, 48. http://www.westnfresh.net.au/Uploadfiles/Australian%20Consumers%20Perceptions%20and%20Preferences%20for%20Hass%20Avocado.pdf. Accessed 19 March 2015.
HDOA (Hawaii Department of Agriculture) (1986). Standards for Hawaii-grown avocados. Marketing and consumer services division. Honolulu:Hawaii Dept. Agr.
Hofman, P. J., Bower, J., & Woolf, A. (2013). Harvesting, packing, postharvest technology, transport and processing. In S. Schaffer, B. N. Wolstenholme, & A. W. Whiley (Eds.), The Avocado: Botany, Production and Uses (pp. 489–540). CAB International: Oxfordshire, Oxford.
Hofman, P. J., Fuchs, Y., & Milne, D. L. (2002). Harvesting. Packaging, postharvest technology, transport and processing, In A. W. Whiley, B. Schafferr, & B.N. Wolstenholme (Eds.), The avocado: botany, production and uses (pp. 363–391), Oxfordshire, UK, CAB International.
Hofman, P. J., Jobin-Décor, M., & Giles, J. (2000). Percentage dry matter and oil content are not reliable indicators of later-harvested ‘Hass’ fruit maturity or quality. Hortscience, 35, 694–695.
Jacobi, K. K., Wong, L. S., & Giles, J. E. (1995). Effect of fruit maturity on quality and physiology of high-humidity hot air-treated ‘Kensington’ mango (Mangifera indica Linn.). Postharvest Biology and Technology, 5, 149–159.
Kader, A. A. (1999). Fruit maturity, ripening, and quality relationships. Acta Horticulturae, 485, 203–208.
Kader, A. A., Sommer, N. F., & Arpaia, M. L. (2002). Postharvest handling systems: tropical fruits. In A. A. Kader (Ed.), Postharvest technology of horticultural crops (pp. 385–398). Oakland: University of California Press.
Kaiser, C., & Wolstenholme, B. N. (1994). Aspects of delayed harvest of Hass avocado (Persea americana Mill.) fruit in a cool subtropical climate I. Fruit lipid and fatty acid accumulation. Journal of Horticultural Science, 69, 437–445.
Kalala, M. B., Modi, A. T., & Cowan, A. K. (2005). Contribution of the seed to fruit development: a tool to understand avocado tree management and fruit maturity parameters. South African Avocado Growers’ Association Yearbook, 28, 33–39.
Kassim, A., Workneh, T. S., & Bezuidenhout, C. N. (2013). A review on postharvest handling of avocado fruit. African Journal of Agricultural Research, 8, 2385–2402.
Kim, S. -M., Chen, P., McCarthy, M. J., & Zion, B. (1999). Fruit internal quality evaluation using on-line nuclear magnetic resonance sensors. Journal of Agricultural and Engineering Research, 74, 293–301.
Köhne, J. S., Kremer-Köhne, S., & Gay, S. H. (1998). Non-destructive avocado fruit firmness measurement. South African Avocado Growers’ Association Yearbook, 21, 19–21.
Kruger, F. J., & Lemmer, D. (2007). Commercial ripening trials with South African avocados in the United Kingdom. South African Avocado Growers’ Association Yearbook, 30, 12–15.
Kruger, F. J., & Magwaza, L. S. (2012). Does orchard soil moisture content at the time of harvest influence the post-storage ripening pattern of ‘Hass’ avocado fruit? South African Avocado Growers’ Association Yearbook, 35, 47–53.
Kruger, F. J., Stassen, P. J. C., & Snijder, B. (1995). The significance of oil and moisture as maturity parameters for avocados. Proceedings of the Thrird World Avocado Congress, 285–288.
Kruger, F. J., Kritzinger, M., & Malumane, R. (2000). Recommendations for controlling the postharvest problems of the Pinkerton cultivar. South African Avocado Growers’ Association Yearbook, 23, 8–14.
Kruger, F. J., Snijders, B., Mathumbu, J. M., Lemmer, D., & Malumane, R. (2004). Establishing appropriate maturity and fruit mineral content norms for the main avocado export cultivars. South African Avocado Growers’ Association Yearbook, 27, 5–10.
Landahl, S., Meyer, M. D., & Terry, L. A. (2009). Spatial and temporal analysis of textural and biochemical changes of imported avocado cv Hass during fruit ripening. Journal of Agricultural and Food Chemistry, 57, 7039–7047.
Lee, S. K. (1981a). Methods for percent oil analysis of avocado fruit. California Avocado Society Yearbook, 65, 133–141.
Lee, S. K. (1981b). A review and background of the avocado maturity standard. California Avocado Society Yearbook, 65, 101–109.
Lee, S. K., & Young, R. C. (1983). Growth measurement as an indication of avocado maturity. Jornal of the American Society for Horticultural Science, 108, 395–397.
Lee, S., Young, R. E., Schiffman, P. M., & Coggins Jr., C. W. (1983). Maturity studies of avocado fruit based on picking dates and dry weight. Journal of the American Society for Horticultural Science, 108, 390–394.
Lehnert, S., Schütz, V., & Nüssel, M. (2014). Quality management and quality assurance in supply chains to food retail. In B. Petersen, M. Nüssel, & M. Hamer (Eds.), Quality and risk management in agri-food chains (pp. 39–44). Wageningen: Wageningen Acdemic Publishers.
Lewis, C. E., Morris, R., & O’Brien, K. (1978). The oil content of avocado mesocarp. Journal of the Science of Food and Agriculture, 29, 943–949.
Liu, X., Robinson, P. N., Madore, M. A., Witney, G. W., & Arpaia, M. L. (1999a). ‘Hass’ avocado carbohydrate fluctuations I. Growth phenology. Journal of the American Society for Horticultural Science, 124, 671–675.
Liu, X., Robinson, P. W., Madore, M. A., Witney, G. W., & Arpaia, M. L. (1999b). ‘Hass’ avocado carbohydrate fluctuations II Fruit growth and ripening. Journal of the American Society for Horticultural Science, 124, 676–681.
Londhe, D., Nalawade, S., Pawar, G., Atkari, V., & Wandkar, S. (2013). Grader: a review of different methods of grading for fruits and vegetables. Agricultural Engineering International: CIGR Journal, 15, 217–230.
Maftoonazad, N., & Ramaswamy, H. S. (2006). Spectral measurements in fruits and vegetables. Stewart Postharvest Reviews, 5, 17–23.
Maftoonazad, N., Karimi, Y., Ramaswamy, H., & Prasher, S. (2011). Artificial neural network modeling of hyperspectral radiometric data for quality changes associated with avocados during storage. Journal of Food Processing and Preservation, 35, 432–446.
Magwaza, L. S., & Opara, U. L. (2015). Analytical methods for determination of sugars and sweetness of horticultural products – a review. Scientia Horticulturae, 184, 179–192.
Magwaza, L. S., Opara, U. L., Nieuwoudt, H., Cronje, P. J., Saeys, W., & Nicolaï, B. (2012). NIR spectroscopy applications for internal and external quality analysis of citrus fruit - a review. Food and Bioprocess Technology, 5, 425–444.
Magwaza, L. S., Opara, U. L., Terry, L. A., Landahl, S., Cronje, P. J. R., Nieuwoudt, H. H., et al. (2013a). Evaluation of Fourier transform-NIR spectroscopy for integrated external and internal quality assessment of ‘Valencia’ oranges. Journal of Food Composition and Analysis, 31, 144–154.
Magwaza, L. S., Opara, U. L., Cronje, P. J. R., Landahl, S., Nieuwoudt, H. H., Mouazen, A. M., et al. (2014a). Assessment of rind quality of ‘Nules Clementine’ mandarin fruit during postharvest storage: 1. Vis/NIRS PCA models and relationship with canopy position. Scientia Horticulturae, 165, 410–420.
Magwaza, L. S., Opara, U. L., Cronje, P. J. R., Landahl, S., Nieuwoudt, H. H., Mouazen, A. M., et al. (2014b). Assessment of rind quality of ‘Nules Clementine’ mandarin fruit during postharvest storage: 2. Robust Vis/NIRS PLS models for prediction of physico-chemical attributes. Scientia Horticulturae, 165, 421–432.
Magwaza, L. S., Landahl, S., Cronje, P. J. R., Nieuwoudt, H. H., Mouazen, A. M., Nicolaï, B. M., et al. (2014c). The use of Vis/NIRS and chemometric analysis to predict fruit defects and postharvest behaviour of ‘Nules Clementine’ mandarin fruit. Food Chemistry, 163, 267–274.
Magwaza, L. S., Ntandane, M. J., & Kruger, F. J. (2009). Follow-up study on the effect that iron supplements have on the post-harvest chilling injury disorder of avocado fruit. South African Avocado Growers’ Association Yearbook, 32, 13–17.
Mans, C. C., Donkin, D. J., & Boshoff, M. (1995). Maturity and storage temperature regimes for KwaZulu Natal avocados. South African Avocado Growers’ Association Yearbook, 18, 102–105.
Marigheto, N., Duarte, S., & Hills, B. P. (2005). NMR relaxation study of avocado quality. Applied Magnetic Resonance, 29, 687–701.
Marsh, K. B., Richardson, A. C., & Macrae, E. A. (1999). Early- and mid-season temperature effects on the growth and composition of satsuma mandarins. Journal of Horticultural Science and Biotechnology, 74, 443–451.
Mehl, P., Chao, K., Kim, M., & Chen, Y. R. (2002). Detection of defects on selected apple cultivars using hyperspectral and multispectral image analysis. Transaction of the American Society for Agricultural Engineers, 18, 219–226.
Meir, S., Akerman, M., Fuchs, Y., & Zauberman, G. (1995). Further studies of the controlled atmosphere storage of avocados. Postharvest Biology and Technology, 5, 323–330.
Meyer, M. D., & Terry, L. A. (2008). Extraction and subsequent quantification of fatty acids and sugars from avocado mesocarp tissue. Journal of Agricultural and Food Chemistry, 56, 7439–7445.
Meyer, M. D., & Terry, L. A. (2010). Fatty acid and sugar composition of avocado, cv. Hass, in response to treatment with an ethylene scavenger or 1-methylcyclopropene to extend storage life. Food Chemistry, 121, 1203–1210.
Mizrach, A. (2000). Determination of avocado and mango fruit properties by ultrasonic technique. Ultrasonics, 38, 717–722.
Mizrach, A. (2008). Ultrasonic technology for quality evaluation of fresh fruit and vegetables in pre- and postharvest processes. Postharvest Biology and Technology, 48, 315–330.
Mizrach, A., & Flitsanov, U. (1995a). Predicting avocado shelf life by an ultrasonic non-destructive method. Acta Horticulturae, 421, 111–119.
Mizrach, A., & Flitsanov, U. (1995b). Ultrasonic device for avocado shelflife prediction and maturity detection. Proceedings of the Third World Avocado Congress, 300–306.
Mizrach, A., & Flitsanov, U. (1999). Nondestructive ultrasonic determination of avocado softening process. Journal of Food Engineering, 40, 139–144.
Mizrach, A., Flitsanov, U., El-Batsri, R., & Degani, C. (1999). Determination of avocado maturity by ultrasonic attenuation measurements. Scientia Horticulturae, 80, 173–180.
Mizrach, A., Galili, N., Gan-Mor, S., Flitsanov, U., & Prigozin, I. (1996). Model of ultrasonic parameters to assess avocado properties and shelf life. Journal of Agricultural and Engineering Research, 65, 261–267.
Obenland, D., Collin, S., Sievert, J., Negm, F., & Arpaia, M. L. (2012). Influence of maturity and ripening on aroma volatiles and flavor in ‘Hass’ avocado. Postharvest Biology and Technology, 71, 41–50.
Olarewaju (2015). Evaluation of maturity parameters of ‘Fuerte’ and ‘Hass’ avocado fruit. MSc Thesis:Univeristy of KwaZulu-Natal, Pietermaritzburg, South Africa.
OECD (Organisation for Economic Co-operation and Development) (2004). International Standardisation of Fruit and Vegetables: Avocados, 8–31.
Özdemir, A. E., Çandır, E. E., Toplu, C., Kaplankıran, M., Demirkeser, T. H., & Yıldız, E. (2009). The effects of physical and chemical changes on the optimum harvest maturity in some avocado cultivars. African Journal of Biotechnology, 8, 1878–1886.
Ozdemir, F., & Topuz, A. (2004). Changes in dry matter, oil content and fatty acids composition of avocado during harvesting time and post-harvesting ripening period. Food Chemistry, 86, 79–83.
Pak, H. A., Dixon, J., & Cutting, J. (2003). Influence of early season maturity on fruit quality in New Zealand ‘Hass’ avocadoes. Proceedings of the Fifth World Avocado Congress, 635–640.
Parodi, G., Sanchez, M., & Daga, W. (2007). Correlation of oil content, dry matter and pulp moisture as harvest indicators in Hass avocado fruit (Persea americana Mill) grown under two conditions of orchards in Chincha-Peru. Proceedings VI World Avocado Congress, Chile. 12–16 Nov. 2007. http://www.avocadosource.com/WAC6/en/Extenso/4a-174.pdf. Accessed 14 June 2015.
Pedreschi, R., Muñoz, P., Robledo, P., Becerra, C., Defilippi, B. G., van Eekelen, H., et al. (2014). Metabolomics analysis of postharvest ripening heterogeneity of ‘Hass’ avocadoes. Postharvest Biology and Technology, 92, 172–179.
Peleg, K., Ben-Hanan, U., & Hinga, S. (1990). Classification of avocado by firmness and maturity. Journal of Texture Studies, 21, 123–139.
Quiñones-Islas, N., Meza-Márquez, O. G., Osorio-Revilla, G., & Gallardo-Velazquez, T. (2013). Detection of adulterants in avocado oil by Mid-FTIR spectroscopy and multivariate analysis. Food Research International, 51, 148–154.
Ranney, C. A., Gillette, G., Brydon, A., McIntyre, S., Rivers, O., Vasquez, C. A., et al. (1992). Physiological maturity and percent dry matter of California avocado. Proceedings of the Second World Avocado Congress, 379–385.
Kosenthal, I., Merin, U., Popel, G., & Bernstein, S. (1985). An analytical assay for the determination of oil content in avocado. California Avocado Society Yearbook, 69, 133–136.
Schaffer, B., Wolstenholme, B. N., & Whiley, A. W. (2013). Introduction. In B. Schaffer, B. N. Wolstenholme, & A. W. Whiley (Eds.), The avocado: botany, production and uses (pp. 1–9). Oxford, CAB International: Oxfordshire.
Schmilovitch, Z., Hoffman, A., Egozi, H., El-Batzi, R., & Degani, C. (2001). Determination of avocado maturity by near infrared spectrometry. Acta Horticulturae, 562, 175–179.
Schütz, V., Lehnert, S., & Nüssel, M. (2014). Quality management and quality assurance in supply chains to food retail. In B. Petersen, M. Nüssel, & M. Hamer (Eds.), Quality and risk management in agri-food chains (pp. 29–38). Wageningen Acdemic Publishers: The Netherlands.
Self, G. K., Ordozgoiti, E., Povey, M. J. W., & Wainwright, H. (1994). Ultrasonic evaluation of ripening avocado flesh. Postharvest Biology and Technology, 4, 111–116.
Sippel, A. D., Holmes, M. A., & Claassens, N. J. F. (1995). Fruit maturity of the ‘Pinkerton’ avocado as affected by fruit set period. Proceedings of the Third World Avocado Congress, 289–293.
Snijder, B., Mathumbu, J. M., & Kruger, F. J. (2003). Development of fruit maturity and mineral content norms for export avocado cultivars from different South African avocado growing regions. Proceedings of the Fifth World Avocado Congress, 641–645.
Snijder, B., Penter, M. G., Mathumbu, J. M., & Kruger, F. J. (2002). Further refinement of Pinkerton export parameters. South African Avocado Growers’ Association Yearbook, 25, 51–55.
Sotto, R. C. (2000). Avocado production in Asia and the Pacific: avocado production in the Philippines. FAO/RAP publication:, 2000(09), 39–48.
Sugiyama, J., & Tsuta, M. (2010). Visualization of sugar distribution of melons by hyperspectral technique. In D. -W. Sun (Ed.), Hyperspectral imaging for food quality analysis and control (pp. 349–368). Elsevier, Amsterdam: Academic Press.
Swarts, D. H. (1981). Fermometer ondersoeke by avokado’s. South African Avocado Growers’ Association Yearbook, 4, 42–46.
Tesfay, S. Z., Bertling, I., & Bower, J. P. (2012a). D-mannoheptulose and perseitol in ‘Hass’ avocado: metabolism in seed and mesocarp tissue. South African Journal of Botany, 79, 159–165.
Tesfay, S. Z., Bertling, I., Bower, J. P., & Lovatt, C. (2012b). The quest for the function of ‘Hass’ avocado carbohydrates: clues from fruit and seed development as well as seed germination. Australian Journal of Botany, 60, 79–86.
Tsuta, M., Sugiyama, J., & Sagara, Y. (2002). Near-infrared imaging spectroscopy based on sugar absorption for melons. Journal of Agricultural and Food Chemistry, 50, 48–52.
Valero, C., Crisosto, C. H., & Slaughter, D. (2007). Relationship between nondestructive firmness measurements and commercially important ripening fruit stages for peaches, nectarines and plums. Postharvest Biology and Technology, 44, 248–253.
Villa-Rodríguez, J. A., Molina-Corral, F. J., Ayala-Zavala, J. F., Olivas, G. I., & González-Aguilar, G. A. (2011). Effect of maturity stage on the content of fatty acids and antioxidant activity of ‘Hass’ avocado. Food Research International, 44, 1231–1237.
Vinha, A. F., Moreira, J., & Barreira, S. V. P. (2013). Physicochemical parameters, phytochemical composition and antioxidant activity of the Algarvian avocado (Persea americana Mill.). Journal of Agricultural Science, 5, 100–109.
Walsh, K. B., Golic, M., & Greensill, C. V. (2004). Sorting of fruit using near infrared spectroscopy: application to a range of fruit and vegetables for soluble solids and dry matter content. Journal of Near Infrared Spectroscopy, 12, 141–148.
Wang, W., & Paliwal, J. (2007). Near-infrared spectroscopy and imaging in food quality and safety. Sensing and Instrumentation for Food Quality and Safety, 1, 193–207.
Wang, M., Zheng, Y., Khuong, T., & Lovatt, C. J. (2012). Effect of harvest date on the nutritional quality and antioxidant capacity in ‘Hass’ avocado during storage. Food Chemistry, 135, 694–698.
Wedding, B. B., Wright, C., Grauf, S., & White, R. D. (2011a). The application of near infrared spectroscopy for the assessment of avocado quality attributes, Intech Open Access. http://cdn.intechopen.com/pdfs-wm/36050.pdf. Accessed 19 March 2015.
Wedding, B. B., Wright, C., Grauf, S., White, R. D., & Gadek, P. A. (2011b). Near infrared spectroscopy as a rapid non-invasive tool for agricultural and industrial process management with special reference to avocado and sandalwood industries. Desalination and Water Treatmen, 32, 365–372.
Wedding, B., Wright, C., Grauf, S., White, R., & Gadek, P. (2011c). Non-invasive assessment of avocado quality attributes. Proceedings of the Seventh World Avocado Congress, 5–9.
Wedding, B. B., White, R. D., Grauf, S., Wright, C., Tilse, B., Hofman, P., et al. (2010). Non-destructive prediction of ‘Hass’ avocado dry matter via FT-NIR spec-troscopy. Journal of the Science of Food and Agriculture, 91, 233–238.
Wedding, B. B., Wright, C., Grauf, S., White, R. D., Tilse, B., & Gadek, P. (2013). Effects of seasonal variability on FT-NIR prediction of dry matter content for whole ‘Hass’ avocado fruit. Postharvest Biology and Technology, 75, 9–16.
Whiley, A., Saranah, J., & Rasmussen., T. S. (1992). Effect of the time of harvest on fruit size and yield on trunk starch concentration. In C. J. Lovatt, P. A. Holthe, M. L. Arpaia, (Eds.). Proceedings of the Second World Avocado Congress, 155–159.
Whiley, A. W., Rasmussen, T. S., Saranah, J. B., & Wolstenholme, B. N. (1996a). Delayed harvest effects on yield, fruit size and starch cycling in avocado (Persea americana Mill.) in subtropical environments. I. The early-maturing cv. Fuerte. Scientia Horticulturae, 66, 23–34.
Whiley, A. W., Rasmussen, T. S., Saranah, J. B., & Wolstenholme, B. N. (1996b). Delayed harvest effects on yield, fruit size and starch cycling in avocado (Persea americana Mill.) in subtropical environments. II. The late-maturing cv. Hass. Scientia Horticulturae, 66, 35–49.
White, A., Woolf, A., Harker, R., & Davy, M. (1999). Measuring avocado firmness: assessment of various methods. Revista Chapingo Serie Horticultura, 5, 389–392.
Wills, R. B. H., McGlasson, W. B., Graham, D., & Joyce, D. C. (2007). Postharvest: an introduction to the physiology and handling of fruit, vegetables and ornamentals (5th ed.,). Oxfordshire, Oxford: CAB International.
Woolf, A. B., White, A., Arpaia, M., & Gross, K. C. (2004). Avocado. In K. C. Gross, C. Y. Wang, & M. Salveit (Eds.), Agriculture handbook 66: the storage of fruits, vegetables and florist and nursery stocks. http://www.ba.ars.usda.gov/hb66/avocado.pdf. Accessed 04 March 2015.
Woolf, A., Clark, C., Terander, E., Phetsomphou, V., Hofshi, R., Arpaia, M. L., et al. (2003). Measuring avocado maturity; ongoing developments. The Orchardist, 40–45. http://209.143.153.251/Journals/Orchardist/WoolfAllan2003b.pdf. Accessed 18 March 2015.
Woolf, A. B., Wibisono, R., Farr, J., Hallett, A., Richter, L., Oey, I., et al. (2013). Effect of high pressure processing on avocado slices. Innovation in Food Scince and Emerging Technologies, 18, 65–73.
Wu, D., & Sun, D. -W. (2013). Colour measurements by computer vision for food quality control—a review. Trends in Food Science and Technology, 29, 5–20.
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Magwaza, L.S., Tesfay, S.Z. A Review of Destructive and Non-destructive Methods for Determining Avocado Fruit Maturity. Food Bioprocess Technol 8, 1995–2011 (2015). https://doi.org/10.1007/s11947-015-1568-y
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DOI: https://doi.org/10.1007/s11947-015-1568-y