| B417 | Laminaria(昆布多糖（海带多糖)) | 100mg/250mg/1g/5g原装 | 190/400/1340/5590 | Sigma L9634 |
| B418 | L-Arginine(L-精氨酸) | 25g | 90 | Sigma分装 |
| B419 | L-Arginine(L-精氨酸) | 50g/100g/250g/500g/1kg | 70/100/230/360/540 | 国产 |
| B420 | L-ArginineHCl(L-精氨酸盐酸盐) | 50g/250g/500g/Sigma25g | 70/230/370/90 | 国产 |
| B421 | L-AscorbicAcid(L-抗坏血酸,维生素C) | 100g/500g | 60/250 | Amresco分装 |
| B422 | L-Asparagine(L-天门冬酰胺) | 50g/100g/500g/Sigma10g | 80/110/360/50 | 国产 |
| B423 | L-Asparticacid(L-天门冬氨酸) | 100g/250g/Sigma25g | 50/90/50 | 国产 |
| B424 | LBBroth(LB肉汤) | 500g原装/1kg原装 | 770/1510 | Amresco J106 |
| B425 | LBBroth(LB肉汤) | 500g | 650 | BD 240230 |
| B426 | L-Cysteine(L-半胱氨酸) | 50g/100g/250g/500g/1kg | 70/120/280/440/880 | 国产 |
| B427 | L-CysteineHCl(L-半胱氨酸盐酸盐) | 100g/250g/500g/1kg | 70/150/220/430 | 国产 |
| B428 | L-Cystine(L-胱氨酸) | 100g/250g/Sigma10g | 60/120/120 | 国产 |
| B429 | LetheenBroth(Letheen肉汤) | 500g原装 | 2200 | BD 268110 |
| B430 | Leupeptin(亮抑蛋白酶肽) | 5mg/10mg | 380/650 | CNI分装 |
| B431 | L-Fucose（岩藻糖） | 1g/5g | 380/1550 | Sigma F2252 |
| B432 | L-Glutamicacid（L-谷氨酸） | 250g/500g/1kg/10kg | 80/120/180/1300 | Amresco分装 |
| B433 | L-Glutamine(谷氨酰胺) | 50g/250g | 95/450 | Amresco分装 |
| B434 | L-Histidine(L-组氨酸) | 5g/10g | 70/120 | Sigma分装 |
| B435 | L-Hydroxyproline(L-羟脯氨酸) | 1g/5g/10g/25g/100g原装 | 100/270/450/850/2750 | Aldrich H54409 |
| B437 | Linoleicacid(亚油酸) | 1g/5g/25g/100g原装 | 280/650/2520/8290 | SIGMA L1268 |
| B438 | Lipofectamine2000(脂质体2000转染试剂) | 0.75ml | 1900 | Invitrogen原装 |
| B439 | L-Isoleucine(L-异亮氨酸) | 25g /50g/100g/250g | 70/130/220/440 | 国产 |
| B440 | LithiumChloride(氯化锂) | 100g/500g | 170/730 | Amresco分装 |
| B441 | LithiumChloride,8M(氯化锂溶液) | 100ml | 80 | 进口原料自产 |
| B443 | L-LactateDehydrogenase(L-乳酸脱氢酶) | 5ku 原装/10ku 原装 | 500/850 | Sigma L2500 |
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