## 3 Results and Discussion
### Content and Retention Efficiency of Bioactive Compounds and Antioxidant Capacity in Microcapsules  
In order to avoid overestimation of the results due to the effect of GA used as wall material, the PC and AC in the blank (which consist in GA 10%/W/W dried by SB and SFB) were quantified and subtracted from those obtained in the microcapsules. Content and retention efficiency of bioactive compounds and antioxidant capacity in microcapsules are shown in Figure 3a-c. \begin{table}
\begin{tabular}{c c c} \hline \hline \multicolumn{1}{c}{\multirow{2}{*}{**Parameter**}} & \multicolumn{2}{c}{**Results**} \\ \cline{2-3}  & **Dry Weight** & **Fresh Weight** \\ \hline PC (mg GAE/gdw \(\mid\) 1 mg GAE/gfw) & 6.14 \(\pm\) 0.39 & 1.72 \(\pm\) 0.2 \\ TA (\(\mu\)g cya-3-glu/gdw \(\mid\) 1 ug cya-3-glu/gfw) & 18 \(\pm\) 3.4 & 5 \(\pm\) 1.0 \\ AA (\(\mu\)g AA/gdw \(\mid\) 1 ug AA/gfw) & 561 \(\pm\) 49 & 157 \(\pm\) 14 \\ DHA (\(\mu\)g DHA/gdw \(\mid\) 1 ug DHA/gfw) & 2737 \(\pm\) 58 & 766 \(\pm\) 16 \\ Total vitamin (\(\mu\)g AA+DHA/gdw \(\mid\) 1 ug HAA+DHA/gfw) & 3 298 \(\pm\) 49 & 923 \(\pm\) 14 \\ AC (ABTS) (\(\mu\)mol TE/gdw \(\mid\) 1 \(\mu\)mol TE/gfw) & 42.82 \(\pm\) 2.74 & 11.99 \(\pm\) 0.77 \\ AC (DPPH) (\(\mu\)mol TE/gdw \(\mid\) 1 \(\mu\)mol TE/gfw) & 33.24 \(\pm\) 2.76 & 9.31 \(\pm\) 0.77 \\ Moisture content (\%) & & 4.75 \(\pm\) 0.69 \\ \hline \hline \end{tabular}  
* TA: Total anthocyanins, PC: phenolic compounds, AA: ascorbic acid, DHA: dehydrofacorbic acid, AA+DHA: total vitamin C, AC: antioxidant capacity, dw: dry weight, fw: fresh weight. Results are expressed as the mean \(\pm\) standard deviation, \(n=3\).  
\end{table} 
Table 1: Bioactive compounds in dry Mexican plum powder (pulp and peel). Figure 3: Content and retention efficiency of bioactive compounds and antioxidant capacity in microcapsules. **(a)** PC; **(b)** AA, DHA and total vitamin C; **(c)** antioxidant capacity (ABTS and DPPH). Data are expressed as the mean \(\pm\) standard deviation of the analysis in triplicate. The arrows indicate the axis to which the bars belong. RE: retention efficiency; PC: phenolic compounds; AA: ascorbic acid; DHA: dehydrofacorbic acid. Different capital letters of the same color indicate significant difference of RE between spray drying and spout-fluid drying, and lower-case letters of the same color indicate significant difference in the content between spray drying and spout-fluid drying. The Retention Efficiency of PC in the microcapsules is shown in Figure 3a. The microcapsules obtained with SFB showed higher RE than microcapsules by SD (90.05 \(\pm\) 0.9% and 76.04 \(\pm\) 1.3%, respectively). The PC content in the microcapsules by SFB was 8.96 \(\pm\) 0.07 mg GAE/gdw and by SD 7.50 \(\pm\) 0.20 mg GAE/gdw. These PC values were higher than previous reported studies for SD (3.67-4.49 mg GAE/g) [17] and SFB (3.95 mg GAE/g) [16] for _S. purpurea_ pulp extract and pulp juice, respectively. The encapsulation efficiency (EE) of PC was 89.14 \(\pm\) 0.7% for SFB and 75.53 \(\pm\) 0.9% for SD, and almost all the PC retained was encapsulated. Results for AA, DHA and total vitamin C retention are shown in Figure 3b. The microcapsules obtained by SFB showed higher retention of DHA (88.52 \(\pm\) 1.4%) than the microcapsules obtained by SD (81.86 \(\pm\) 1.8); for the AA and total vitamin C retention, no significant difference was observed between SD (90.86 \(\pm\) 1.5% for AA and 78.10 \(\pm\) 1.3% for total vitamin C) and SFB (90.80 \(\pm\) 1.2% for AA and (83.30 \(\pm\) 1.8% for total vitamin C). There are few studies about Mexican plum bioactive compounds' encapsulation, and no studies have reported the DHA retention efficiency. Regarding the content of AA, DHA and total AA in the microcapsules, shown in Figure 3b, microcapsules by SFB showed a higher content of AA (565 \(\pm\) 20 \(\mu\)g AA/gdw) and total vitamin C (2442 \(\pm\) 21 \(\mu\)g AA+DHA/gdw) than SD (429 \(\pm\) 45 \(\mu\)g AA/gdw, and 2343 \(\pm\) 38 \(\mu\)g AA+DHA/gdw); for the DHA content, no significant difference was observed between SFB and SD.