The comparison between the PCA loading plots for UPAS and PAS
samples is depicted in Fig. 5. Other than a slight anti-clockwise rotation,
the relative attribute positioning with respect to each other
remained similar. However, while the “green” and “hay” attributes
are separate and distinct on the UPAS PCA plot, these attributes are
closely associated for the PAS samples. Furthermore, “hay” aroma
was the only attribute that, on average, increased slightly after
steam pasteurization, even though this increase was not significant
(Fig. 3). The change in the “green” and “hay” character of rooibos infusions
was also revealed when comparing the sensory profiles of two
individual UPAS and PAS sample pairs with strong “green” notes
(Fig. 6). Assessors who were not reliable and consistent in rating
“green” flavor and aroma were removed before generating the spider
plots. The spider plot of sample C7 (Fig. 6a) showed a reduction in the
intensity of “green” aroma and flavor as a result of steam pasteurization.
No hay-like notes were perceived after steam pasteurization. In
the case of sample C20 (Fig. 6b), however, the “green” aroma and flavor
was completely lost during steam pasteurization and replaced by
a hay-like aroma and flavor.
The comparison between the PCA loading plots for UPAS and PASsamples is depicted in Fig. 5. Other than a slight anti-clockwise rotation,the relative attribute positioning with respect to each otherremained similar. However, while the “green” and “hay” attributesare separate and distinct on the UPAS PCA plot, these attributes areclosely associated for the PAS samples. Furthermore, “hay” aromawas the only attribute that, on average, increased slightly aftersteam pasteurization, even though this increase was not significant(Fig. 3). The change in the “green” and “hay” character of rooibos infusionswas also revealed when comparing the sensory profiles of twoindividual UPAS and PAS sample pairs with strong “green” notes(Fig. 6). Assessors who were not reliable and consistent in rating“green” flavor and aroma were removed before generating the spiderplots. The spider plot of sample C7 (Fig. 6a) showed a reduction in theintensity of “green” aroma and flavor as a result of steam pasteurization.No hay-like notes were perceived after steam pasteurization. Inthe case of sample C20 (Fig. 6b), however, the “green” aroma and flavorwas completely lost during steam pasteurization and replaced bya hay-like aroma and flavor.
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