Micro-structural changes
Representative cross-sectional SEM images of flesh tissue adjacent to the surface of fresh, IR, and lye treated peaches are presented in Fig. 8. As seen in Fig. 8a, the fresh peach tissue had well defined cell shapes and intact thin cell walls. After IR heating, collapsed parenchyma cells, thickened cell walls, and increased intercellular porous spaces are observed in the peach cellular tissue (Fig. 8b). Such anatomical changes allowed the subsequent peel loosening beneath the epidermal layer and also evidenced the effects of IR radiation on disrupting peach tissues. Dramatic thermal expansion in cell walls was noted for IR treated peaches but not for lye peeled peaches (Fig. 8c). Instead, dissolved dermal layers and degradation of adjacent cell walls were observed, which indicate the chemical diffusion of lye solution into the peach cellular tissue.
Similar observations were reported for lye peeled tomatoes and pimiento peppers from other researchers. It was thus inferred that the mechanisms for peel separation are fundamentally
different between IR dry-peeling and regular wet-lye peeling.
Micro-structural changesRepresentative cross-sectional SEM images of flesh tissue adjacent to the surface of fresh, IR, and lye treated peaches are presented in Fig. 8. As seen in Fig. 8a, the fresh peach tissue had well defined cell shapes and intact thin cell walls. After IR heating, collapsed parenchyma cells, thickened cell walls, and increased intercellular porous spaces are observed in the peach cellular tissue (Fig. 8b). Such anatomical changes allowed the subsequent peel loosening beneath the epidermal layer and also evidenced the effects of IR radiation on disrupting peach tissues. Dramatic thermal expansion in cell walls was noted for IR treated peaches but not for lye peeled peaches (Fig. 8c). Instead, dissolved dermal layers and degradation of adjacent cell walls were observed, which indicate the chemical diffusion of lye solution into the peach cellular tissue.Similar observations were reported for lye peeled tomatoes and pimiento peppers from other researchers. It was thus inferred that the mechanisms for peel separation are fundamentallydifferent between IR dry-peeling and regular wet-lye peeling.
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