<p>Summary of SC and HD from CEH and UCEH.</p>

Purple yam (Dioscorea alata) is a tropical tuber crop that is a source of anthocyanins and starch. Starch can be isolated from the large quantity of extraction residues and become a raw material for hydrolyzate production. Ultrasound pretreatment was evaluated in consecutive enzymatic hydrolysis (UCEH) and simultaneous enzymatic hydrolysis (USEH) of starch from anthocyanin extraction residue (AER-starch). A techno-economic assessment was performed. Ultrasound pretreatment showed a positive influence on CEH and SEH. The hydrolysis degree (HD) was higher in CEH (72.87 ± 3.01%) than in SEH (28.10 ± 1.32%). CEH performed better than SEH, primarily due to the thermal instability of the enzymes. Enzymatic hydrolysis solubilized almost all AER-starch. Starch conversion (SC) above 90% was achieved for all CEH experiments using AER-starch concentrations ranging from 10 to 50 g L-1. The cost of manufacturing (COM) for glucose syrup using AER concentrations of 10 and 350 g L-1 was US$61.25 kg−1 and US$2.90 kg−1, respectively, when the purchasing cost for AER-starch was US$1.50 kg−1. The CRM was the major component of the COM (above 50%) when AER-starch concentrations were higher than 100 g L-1, AER-starch being the primary raw material contributing to the COM. The production of the glucose syrup was economically feasible when the AER-starch purchasing price was under US$1.20 kg-1 and the selling price was at least US$3.50 kg-1.紫山药（Dioscorea alata）是一种热带块根作物，可作为花青素与淀粉的来源。可从大量提取残渣中分离得到淀粉，将其作为水解产物制备的原料。本研究针对花青素提取残渣淀粉（anthocyanin extraction residue-starch, AER-starch），评估了超声预处理（Ultrasound pretreatment）应用于连续酶解（consecutive enzymatic hydrolysis, CEH）与同步酶解（simultaneous enzymatic hydrolysis, USEH）的效果，并开展了技术经济评估。超声预处理对连续酶解（CEH）与同步酶解（SEH）均展现出积极影响。连续酶解的水解度（hydrolysis degree, HD）为72.87±3.01%，高于同步酶解的28.10±1.32%。连续酶解的效果优于同步酶解，主要归因于酶的热不稳定性。酶解过程几乎可将全部AER-starch溶解。当AER-starch浓度范围为10~50 g·L⁻¹时，所有连续酶解实验组的淀粉转化率（starch conversion, SC）均达到90%以上。当AER-starch的采购成本为1.50美元·kg⁻¹时，采用10 g·L⁻¹与350 g·L⁻¹浓度的花青素提取残渣制备葡萄糖浆的制造成本（cost of manufacturing, COM）分别为61.25美元·kg⁻¹与2.90美元·kg⁻¹。当AER-starch浓度高于100 g·L⁻¹时，原材料成本（cost of raw materials, CRM）占制造成本（COM）的比例超过50%，其中AER-starch是推动制造成本升高的主要原料。当AER-starch的采购价格低于1.20美元·kg⁻¹且产品售价不低于3.50美元·kg⁻¹时，该葡萄糖浆的生产具备经济可行性。