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Enhancing anthocyanin–phenolic copigmentation through epicarp layer treatment and edible coatings to retain anthocyanins in thermally processed whole blueberries

花青素 化学 食品科学 颜料 有机化学
作者
Jooyeoun Jung,Chieh‐Yi Lin,Yanyun Zhao
出处
期刊:Journal of Food Science [Wiley]
卷期号:87 (9): 3809-3821 被引量:4
标识
DOI:10.1111/1750-3841.16269
摘要

Anthocyanins in processed fruit degrade significantly due to their heat and oxygen sensitivity and water solubility. Copigmentation for stabilizing anthocyanins is less effective for whole fruit due to anthocyanins' location within cell vacuoles surrounded by the epicarp layer as barrier to prevent copigment complexing with anthocyanins. This study investigated strategies for enhancing anthocyanin-phenolic copigmentation on blueberry surface, and integrated copigmentation with layer-by-layer (LBL) coating to retain anthocyanin stability in thermally processed blueberries. Results indicated that epicarp layer treatment of fruit by Tween 80 (T80) and CaCl2 is important for enhancing anthocyanin-phenolic copigmentation. The sequential copigmentation treatment using T80, ferulic acid, and CaCl2 (T80→FA→CaCl2 ) or T80, tannic acid, and CaCl2 (T80→TA→CaCl2 ) resulted in higher (p < 0.05) retention of total monomeric anthocyanin (3.18 mg/g and 3.38 mg/g, respectively) in thermally processed blueberries after 7-day ambient storage than that of untreated fruit (2.79 mg/g). Percent polymeric color (PPC) of blueberries treated by T80→FA→CaCl2 (15.5%) or T80→TA→CaCl2 (17.4%) was lower (p < 0.05) than that treated by TA alone (22.5%). The LBL coating enhanced microstructure stability for preserving anthocyanins in thermally processed blueberries. This study demonstrated the effectiveness of sequential copigmentation of blueberries after epicarp layer treatment followed by LBL coating for enhancing anthocyanin stability in processed whole fruit. PRACTICAL APPLICATION: When anthocyanin-rich fruit is thermally processed, anthocyanins degrade and leach to aqueous packing solution because of its heat sensitivity and water solubility. This study developed an innovative technology through implementing sequential treatments of copigmentation and water- and heat-resistant coating for preventing heat and water degradation of anthocyanins in whole fruit during processing in aqueous media. The developed technology can be practically applied to enhance the quality and health benefits of thermally processed anthocyanin-rich whole fruit. The technology can not only be utilized to improve existing fruit products, but also develop new and novel fruit products.
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