Piv txwv ntawm Cov Lus Nug Sib Tham Txog Organic Biopolymer
Cov organic biopolymers yog ib qho tseem ceeb hauv chemistry thiab biology, tshwj xeeb tshaj yog thaum nws los txog rau cov khoom siv biodegradable nrog kev siv dav hauv ntau yam lag luam. Hauv tsab xov xwm no, peb yuav tham txog ntau qhov teeb meem piv txwv txog cov organic biopolymers thiab lawv cov lus piav qhia kom muab kev nkag siab tob dua txog lub tswv yim. Lub hom phiaj ntawm tsab xov xwm no yog los pab cov tub ntxhais kawm nkag siab thiab daws cov teeb meem ntsig txog cov organic biopolymers.
Kev Nkag Siab Txog Cov Organic Biopolymers
Ua ntej peb nkag siab txog cov teeb meem piv txwv, nws yog ib qho tseem ceeb kom nkag siab tias cov organic biopolymers yog dab tsi. Cov organic biopolymers yog cov tshuaj macromolecular uas muaj cov monomer units teeb tsa ua cov qauv ntev thiab tsim los ntawm cov txheej txheem biological. Cov piv txwv ntawm cov biopolymers no suav nrog cov protein, nucleic acids (DNA thiab RNA), thiab polysaccharides (xws li cellulose thiab starch).
Cov biopolymers no yog biodegradable, txhais tau tias lawv tuaj yeem raug rhuav tshem los ntawm cov kab mob me me uas tshwm sim hauv ntuj, ua rau lawv zoo rau ib puag ncig dua li cov polymers tsim. Lawv kuj muaj ntau yam kev siv hauv kev kho mob, tshuaj, kev ua liaj ua teb, thiab kev lag luam zaub mov.
Cov Lus Nug Piv Txwv thiab Kev Sib Tham
Lo lus nug 1: Cov qauv protein
Lus Nug: Piav qhia txog cov txheej txheem ntawm kev tsim cov qauv thawj, theem nrab, theem peb, thiab quaternary ntawm cov protein.
Kev Sib Tham:
– Cov Qauv Tseem Ceeb: Cov qauv tseem ceeb yog cov kab sib law liag ntawm cov amino acids hauv cov saw polypeptide. Cov kab sib law liag no txiav txim siab txhua qib ntawm cov qauv thiab yog tsim los ntawm cov peptide bonds muaj zog ntawm pawg carboxyl ntawm ib qho amino acid thiab pawg amino ntawm qhov tom ntej.
– Cov Qauv Thib Ob: Cov qauv thib ob yog tsim los ntawm kev sib txuas lossis kev zawm ntawm cov saw polypeptide vim yog cov hydrogen bonds ntawm cov atoms hauv cov saw tseem ceeb. Cov hom qauv thib ob tseem ceeb yog alpha-helices thiab beta-sheets.
– Cov Qauv Thib Peb: Cov qauv thib peb yog cov duab peb-seem ntawm cov saw polypeptide, uas tshwm sim vim muaj kev sib cuam tshuam ntawm cov saw sab ntawm cov amino acids sib txawv. Cov kev sib cuam tshuam no tuaj yeem suav nrog cov hydrogen bonds, hydrophobic interactions, ionic bonds, thiab disulfide bonds (tshwj xeeb tshaj yog hauv cov amino acid cysteine).
– Cov Qauv Quaternary: Cov qauv Quaternary yog kev teeb tsa ntawm ntau cov saw hlau polypeptide uas tau muab tais (subunits) ua ib qho protein ua haujlwm. Kev sib cuam tshuam ntawm cov subunits tuaj yeem ua rau daim ntawv ntawm cov hydrogen bonds, hydrophobic interactions, thiab lwm yam kev sib cuam tshuam.
Lo Lus Nug 2: Cov Haujlwm thiab Piv Txwv ntawm Polysaccharides
Lus Nug: Hais ob hom polysaccharides, lawv cov haujlwm, thiab piv txwv ntawm txhua hom.
Kev Sib Tham:
– Cellulose: Cellulose yog ib qho polysaccharide uas pom muaj nyob rau hauv cov phab ntsa cell ntawm cov nroj tsuag. Nws lub luag haujlwm yog los muab lub zog thiab kev ruaj khov rau cov qauv ntawm cov nroj tsuag. Piv txwv li suav nrog paj rwb, ntoo, thiab lwm yam fibers ntawm cov nroj tsuag.
– Hmoov txhuv nplej siab: Hmoov txhuv nplej siab yog ib hom polysaccharide uas khaws lub zog hauv cov nroj tsuag. Cov nroj tsuag khaws lub zog hauv daim ntawv ntawm hmoov txhuv nplej siab hauv cov noob thiab cov noob taub. Piv txwv li suav nrog qos yaj ywm, pob kws, thiab mov.
Lo lus nug 3: Kev puas tsuaj ntawm cov yas bioplastic
Lo lus nug: Piav qhia txog txoj kev ua kom cov bioplastics puas tsuaj thiab hais txog cov yam uas cuam tshuam rau nws.
Kev Sib Tham:
Kev puas tsuaj ntawm cov yas hauv lub cev yog cov txheej txheem uas cov kab mob me me (xws li cov kab mob thiab cov pwm) rhuav cov yas hauv lub cev ua cov molecule me me xws li carbon dioxide, dej, thiab biomass. Lub tshuab puas tsuaj no suav nrog cov enzymes uas cov kab mob me me no tsim tawm.
Cov yam tseem ceeb uas cuam tshuam rau qhov kev puas tsuaj ntawm cov khoom siv bioplastics suav nrog:
- Hom Polymer: Cov polymers yooj yim dua, cov polymers ntuj dua feem ntau yuav lwj yooj yim dua.
– Ib puag ncig: Kub, av noo, pH, thiab qhov muaj oxygen cuam tshuam rau kev ua haujlwm ntawm cov kab mob me me.
- Cov kab mob me me: Qhov sib txawv thiab tus naj npawb ntawm cov kab mob me me hauv ib qho chaw muaj feem cuam tshuam rau qhov nrawm ntawm kev puas tsuaj.
– Cov Qauv Polymer: Cov Polymers uas muaj cov tshuaj sib txuas ntau dua feem ntau nyuaj rau lwj.
– Muaj cov khoom ntxiv: Qee cov yas bioplastics muaj cov khoom ntxiv uas tuaj yeem ua kom sai lossis qeeb cov txheej txheem biodegradation.
Lo lus nug 4: Cov kua qaub nucleic
Lus Nug: Qhov txawv tseem ceeb ntawm DNA thiab RNA yog dab tsi hais txog cov qauv thiab kev ua haujlwm?
Kev Sib Tham:
- Cov Qauv:
– DNA: Deoxyribonucleic acid (DNA) muaj ob txoj polynucleotide uas tsim ua ob lub helix. Cov monomeric units ntawm DNA yog deoxyribonucleotides, uas muaj cov nitrogenous bases (adenine, thymine, cytosine, thiab guanine), deoxyribose sugar, thiab ib pawg phosphate.
– RNA: Ribonucleic acid (RNA) feem ntau muaj ib txoj hlua ntawm polynucleotides. Cov chav monomeric ntawm RNA yog ribonucleotides, uas muaj cov hauv paus nitrogenous (adenine, uracil, cytosine, thiab guanine), ribose qab zib, thiab ib pawg phosphate.
- Kev Ua Haujlwm:
– DNA: DNA ua haujlwm ua lub chaw khaws cov ntaub ntawv txog noob caj noob ces hauv daim ntawv ntawm cov kab ke nucleotide uas tau xa mus los ntawm ib tiam neeg mus rau lwm tiam. DNA kuj tswj feem ntau cov haujlwm ntawm lub cell los ntawm kev tswj hwm kev qhia tawm noob caj noob ces.
- RNA: RNA ua haujlwm ntau yam hauv cov txheej txheem qhia txog noob caj noob ces, suav nrog ua tus nqa cov lus qhia txog noob caj noob ces los ntawm DNA mus rau ribosomes (mRNA), pab tsim cov qauv ribosome (rRNA), thiab nqa cov amino acids mus rau ribosomes thaum lub sijhawm txhais lus (tRNA).
Lo lus nug 5: Cov Khoom Siv Ntuj Tsim Los Ntawm Biopolymers
Lus Nug: Piav qhia txog peb qhov chaw ntuj tsim ntawm biopolymers thiab piv txwv ntawm cov khoom uas lawv tsim tawm.
Kev Sib Tham:
– Cov Nroj Tsuag: Cov biopolymers xws li cellulose thiab starch yog los ntawm cov nqaij ntawm cov nroj tsuag. Piv txwv li suav nrog cov ntaub textile fibers los ntawm paj rwb (cellulose) thiab cov khoom siv raw rau bioplastics los ntawm starch (piv txwv li, PLA - Polylactic Acid).
– Cov Tsiaj: Chitin yog ib qho biopolymer pom nyob rau hauv exoskeletons ntawm kab thiab crustaceans. Hloov mus ua chitosan, chitin yog siv rau hauv cov khoom kho mob xws li cov ntaub qhwv thiab cov txheej txheem xa tshuaj.
– Cov kab mob me me: Qee cov kab mob me me muaj peev xwm tsim cov biopolymers xws li polyhydroxyalkanoates (PHAs). PHAs yog siv rau hauv kev tsim ntau yam bioplastics uas lwj tau.
Xaus
Cov organic biopolymers yog cov khoom tseem ceeb hauv ntau yam ntawm lub neej thiab thev naus laus zis. Kev nkag siab txog cov qauv, kev ua haujlwm, thiab qhov tseem ceeb ntawm cov biopolymers no tuaj yeem muab kev nkag siab tob dua txog lawv pab txhawb rau kev muaj ntau haiv neeg thiab kev tsim cov khoom lag luam uas zoo rau ib puag ncig. Nrog rau cov piv txwv thiab kev sib tham saum toj no, vam tias cov nyeem ntawv yuav nkag siab zoo dua thiab npaj txhij los teb ntau yam lus nug ntsig txog cov organic biopolymers.
