Cassava is grown because of its starchy roots, but the leaves being rich in protein are mostly underutilized. For protein recovery, mechanical juice extraction from cassava leaves and the extraction process was evaluated using computational fluid dynamics (CFD) simulation. The influence of input variables such as nozzle diameter and rotational speed of the screw was investigated in relation to process efficiency. The highest green juice extraction yield (81.0%) from cassava leaves and dry matter of press cake (61.3%) were achieved by using 4 mm nozzle diameter and 18 rpm screw speed. The protein content of the cassava leaves, press cake, juice sediment, and juice supernatant was found to be 31.5%, 27.7%, 26.2%, and 12.4%, respectively. The crude protein, cellulose, hemicellulose, lignin, and total phenolic content mainly accumulated in the press cake. The screw pressing concentrated the amino acids in the press cake and the juice sediment.

Cassava production generates significant amounts of by-products such as leaves and tuber peel. Instead of considering them as waste, valorization aims to find sustainable ways to utilize them. However, the presence of cyanide and insoluble fibers poses a major obstacle to their conversion into valuable products. Therefore, the objective of this study is to investigate the changes in cyanide concentration and quality of cassava leaves after mechanical pressing and in tuber peel after treatment with an enzyme solution. Frozen leaves were screw-pressed into their fractions: juice, and press cake. The results show that the cyanide level in the press cake was reduced to 73.56% and was concentrated by 97.48% in the juice compared to the frozen leaves. However, the crude protein values of the frozen leaves, juice, and press cake did not differ significantly (p > 0.05), and were 27.09%, 25.47%, and 23.82%, respectively. In addition, the results for the peel revealed that pretreatment with Viscozyme^® L, which assists in the mechanical peeling of cassava tubers, also contributed to a reduction in cyanide and insoluble fiber in the peel. Cyanide content was lowered by 53.89–58.94% in enzyme-treated peel from all three runs (ETP1-3) when compared to fresh peel (FP), while the reduction was only 8.63% in the control peel (CP) treated with hot water without enzyme solution. The insoluble fibers in cassava peel, such as neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and crude fiber (CF), were also degraded more effectively after treatment with an enzyme solution than with hot water.

Purpose: This paper aims to investigate breastfeeding and complementary feeding practices among children less than five years old and living in a rice surplus area in Demak Regency, Central Java.Design/methodology/approach: From December 2014 to February 2015, a cross-sectional survey was carried out in Demak, which had a high proportion of undernourished children despite high rice production. In total, 384 mothers having children below five years old from farmer family background were interviewed using a structured questionnaire about sociodemographic parameters and child feeding practices. Food habits were also investigated among these women during two focus group discussions in two selected sub-districts.Findings: Only 10.9 per cent of the children were exclusively breastfed for six months. About 60 per cent of the mothers practiced supplementary feeding in addition to breastfeeding and started complementary feeding too early. Duration of exclusive breastfeeding practice and child’s age at onset of complementary feeding were positively correlated (p= 0.04). The main reasons of supplementary feeding and too early introduction of complementary food were based on the elderly women’s opinions, and the very short duration of maternity leave for employed mothers. Mothers with a low education level had a higher chance of not reaching the optimum score of complementary feeding practices (p= 0.012).Originality/value: Despite a high level of food security in the project area, inadequate knowledge of young child feeding practices has contributed to sub-optimal breastfeeding practices. Higher educated women were more likely to follow optimal complementary feeding practices. Therefore, promotion of breastfeeding and complementary feeding practices targeting all key actors should be implemented in the study area to prevent undernutrition among infants.