Patent ID: 11864561
Assignee: THANH DUC LE
Field: Basic materials chemistry (Chemistry)
Classification: CPC A  C | IPC A  C

Claim 2:
3. The multipurpose fertilizer composition of claim 1, wherein the pectin extract from yam (Dioscorea alataL.) created by performed in a specific order from (i′) to (v′) comprising:
(i′) selecting yams (Dioscorea alata L.) that are not crushed or rotten; then washing them with water to remove impurities;
(ii′) peeling off the outer skin, crushing, stirring for 5-10 minutes, then filtering by filter cloth to create a first yams residue;
(iii′) drying the first yams residue at 70° C.-80° C. for 20-24 hours to create a yams of powder having moisture content of 10%-13%;
(iv′) hydrolyzing 1 part of the yams of powder with 20 parts of H2SO4 acid solution including two stages:
stage 1: soaking 1 part of the the yams of powder with 15 parts of H2SO4 acid at 80° C. for 1.5 hours, with the combination of stirring, and maintain pH at 1.5;
stage 2: adding 5 parts of H2SO4 acid for continue soaking at 50° C. for 1 hour, with the combination of stirring, and maintain pH at 2, then filtering to create a first yams filtrate, and a second yams residue;

(v′) hydrolyzing 1 part of the second yams residue with 10 parts acetic acid including two stages:
stage 1: soaking 1 part the second yams residue with 7 parts of acetic acid at 80° C. for 45 minutes, with the combination of stirring, and maintain pH at 2;
stage 2: adding 3 parts of acetic acid for continue soaking at 40° C. for 30 minutes, with the combination of stirring, and maintain pH at 2, then filtering to create a second yams filtrate, and the pectin-reduced yams residue;

(vi′) centrifuging a mixture of the first yams filtrate at step (iv′) and the second yams filtrate at step (v′) with 3000-3500 rpm for 15 minutes to create the pectin extract from yam.