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ARS Home » Pacific West Area » Albany, California » Western Regional Research Center » Healthy Processed Foods Research » Research » Publications at this Location » Publication #376215
Research Project: New Sustainable Processing Technologies to Produce Healthy, Value-Added Foods from Specialty Crops

Location: Healthy Processed Foods Research

Title: Fate of nutrients of interest during direct sun-drying of apricots

Author
item Olsen, Carl
item Milczarek, Rebecca

Submitted to: Proceedings of the American Society of Agricultural and Biological Engineers International (ASABE)
Publication Type: Proceedings
Publication Acceptance Date: 7/13/2020
Publication Date: 7/15/2020
Citation: Olsen, C.W., Milczarek, R.R. 2020. Fate of nutrients of interest during direct sun-drying of apricots. Proceedings of the American Society of Agricultural and Biological Engineers International (ASABE). Paper number: 2000153. https://doi.org/10.13031/aim.202000153.
DOI: https://doi.org/10.13031/aim.202000153

Interpretive Summary:

Technical Abstract: Apricot (Prunus armeniaca) is a stone fruit commonly consumed in sun-dried form. Processors often apply a sulfite pretreatment to the fruit to help maintain its vivid orange color and nutrient content during drying. However, there is a population that is sensitive to sulfites, and organic dried fruit cannot contain sulfites. Thus, next-generation solar drying systems are needed to help reduce or eliminate sulfites via improved processing conditions. In this work, 2 types of acrylic dryer lid (standard clear and UV-blocking) were compared to open-air drying to determine their effects on degradation of several nutrients of interest in apricots. In addition, pretreatments of 25-minute sodium metabisulfite dips at 1 of 3 levels (High – 60 ppm, Medium – 15 ppm, Low – water dip) were applied to the apricots to determine effects from sulfite pretreatment intensity. Three replicate sun-drying runs were performed at the USDA – Agricultural Research Service laboratory in Albany, California, during the Fall of 2017. Results showed that nutrients of interest decreased significantly over time for all treatments. The UV-Blocking acrylic yielded higher residual sulfites than did the open-air treatment. Sulfite treatment had a significant effect on total soluble phenolics and antioxidant activity, with the High sulfite treatment yielding the lowest values of these quality metrics. Vitamin C was higher in High sulfite pretreatment than Medium or Low. ß-carotene content increased with increasing intensity of sulfite pretreatment. The results of this work will inform the design of solar drying systems for both sulfited and unsulfited apricots.